Tanking Membranes

'Type C' Waterproofing is defined in BS 8102:2009 as ‘drained protection’ which is achieved by the incorporation of a drained cavity within the basement structure. The basement wall must provide enough primary resistance to water ingress to ensure the cavity only accepts a controlled amount of water or dampness. Water is collected in the cavity between the external wall and... Read More

Tanking Membranes

Platinum CV8 Cavity Drain Membrane (8mm Stud)
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Platinum CV8 Cavity Drain Membrane (8mm Stud)

£120.00 ex. VAT | £144.00 inc. VAT

Platinum CV8 Cavity Drain Membrane (8mm Stud)

Platinum CV8 Cavity Drain Membrane (8mm Stud)

Platinum Building Chemicals Ltd | Waterproofing Membranes

Cavity Drain Membranes Waterproof Membranes

Platinum CV8 is a high quality Cavity Drain Membrane manufactured from high-density polyethylene (HDPE).

Platinum CV8 impermeable and resistant to the usual chemicals in the building construction. Studs are formed in a regular pattern on the one face of the product. The studs are spaced at approx. 25mm centres in both directions.

Platinum CV8 is CE marked in accordance with EN 13967 and EN 13984.

Platinum CV8 membrane is tough but pliable and can be bent round corners and projections without risk of breaking, even in very low temperatures. The product can be easily cut with a knife or scissors.

Available in various Roll sizes ranging from 10M² to 40M².

Design Consideration

Membrane Suitability:

Platinum CV8 Cavity Drain Membrane can be applied to almost all sound building structures below ground, which are affected by dampness or water ingress. However, they are not recommended for installation in the following situations.

  • Where the Cavity Membrane System cannot be drained, otherwise the system will fail.

  • Fixed onto internal flat soffits unless the soffit has an existing fall or a fall can be formed at the design stage (in the case of new build construction) or created using sand & cement renders, otherwise water would pond behind the membrane and build up like a balloon. The weight of water would inevitably burst the membrane seals, which are not designed to hold water under pressure.

  • Under or on top of concrete/stone staircase treads and risers, because of the many convoluting junctions and angle details. In such circumstances, we recommend they be treated independently using an epoxy vapour barrier.

Ingressing Water:

Platinum CV8 Cavity Drain Membranes are capable of dealing with (quite) large volumes of water, so ingressing water will not usually require remedial action. But if the flow rate is such that it will be able to carry silts / dissolved lime with it, then this inflow should be stemmed/controlled prior to fitting the membrane. This can be achieved as follows.

  • If ingressing water is localised then the application of Water-Stop Plugging Compound will often be sufficient.

  • If ingressing water is more general and cannot be dealt with by localised plugging, consideration should be given to applying a general coat of 3:1 render incorporating an accelerator in the mix.

When water is flowing through concrete or mortar (particularly when it is new) there is a tendency for dissolved lime to be brought into the cavity.

This lime can then come out of solution and block up cavities and drains. If this is a risk, then the source of water ingress needs to be treated in the same way as silt bearing water, as described above.

NB: Regardless of conditions at the time of inspection, BS 8102 says it must be assumed hydrostatic pressure is going to occur at some time during the lifetime of the basement. This means that some form of water removal system must always be fitted with a Cavity Membrane in below ground structures.

Drainage Types:

There are two principle forms of drainage, these are natural (gravity) and mechanical (sump & pump) and can be used in conjunction with falls or drainage channels.

However, when assessing the type of drainage facility to be used and because the drainage is the key to the success of the cavity membrane system, it is important to take into consideration the following points.

Natural - (Combined Foul Chambers & Integral Gullies)

Where drainage with gravity is feasible within the bounds of the property or at a point of exit from the property, it is most important to establish that the ‘internal drainage’ is in good working order and to question whether the local drains are connected to public drains or a soakaway.

Drains can and do block up or back up causing flooding, including escape of foul waste and pungent smells.

Soakaways can also fill up during periods of heavy rain, which would lead to flooding and failure of the cavity membrane system.

In situations where the membrane installer finds that the only possibility of draining the cavity membrane is into a foul / soakaway system or his client so instructs, liability for the waterproofing system should therefore be excluded in the event of blockage of the foul pipes or the soakaways filling up. We always recommend the inclusion of sump and pumps.

Mechanical - (Sump & Pump)

Platinum Chemicals offer an off-the-shelf sump and pump drainage system, ‘The Aqua Pump Range’ and ‘Aqua Pump Pro Range’ which has been specifically  designed for the purpose of controlling ground water ingress.

The simple to fit sump pump kit comprises a polyethylene pre-formed sump chamber with a structural lid. The submersible Aqua Pump is controlled by an automatic integral float switch and comes with a non-return valve and a high level water alarm that warns of mechanical or power failure.

However, it would be prudent to install a double pump system ‘The Aqua Pump Plus Kit’ which consists of two pumps in the sump chamber. This secondary pump would provide a back up in case of mechanical failure of the principal pump.

Consideration should also be given to installing a Battery Back-up Pump in case of a power failure and is also available from Platinum Chemicals.

Drainage Channel - (Triton® Aqua Channel Drainage System)

Platinum CV8 can be used in conjunction with Triton® Aqua Channel, which is a PVC drainage conduit specifically designed for the control of water ingress in below ground situations.

It is fitted around the perimeter of the floor at the vulnerable wall / floor junction and can be used in most waterproofing situations, and is particularly suited for use in conjunction with Cavity Drain Membrane Systems.

Water entering the building through the walls is controlled behind the membrane and diverted to the Aqua Channel at the base of the wall. The water enters the Aqua Channel through pre-drilled drainage holes and must then be diverted to a suitable drainage point, either natural or a sump and mechanical pump. Rodding Eyes can also be incorporated into the Aqua Channel.

Falls - (Floors)

It is essential that there are no undulating surfaces or depressions in the floor. In new build or whenever floors are being replaced, the floor slabs can be designed and constructed to falls 2° or 3° towards the water collection facility, i.e. sump chamber.

Where an existing solid floor is to be retained a sand/cement screed can be laid over the entire floor gently sloping towards the sump. In all cases the floor should always be tested by spraying with a hose, to ensure that all water finds its way to the water collection point before laying the cavity membrane.

Note: Wherever possible (head height permitting) we recommend that Platinum CV20 be used on floors. This is because the Platinum CV20 Membrane has a far greater drainage capacity and significantly reduces the risk of hydrostatic pressure building up within the cavity.

Undermining Structures:

Sump Chambers

Consideration must be given to the implications of fitting sumps in the ground, e.g. where unstable elements are present, such as chalk or sand.

The installation of a perforated sump chamber could cause washing away and potential undermining. Therefore, in such cases, only sealed sumps should be installed and structurally held in place by concrete etc, with the water collection limited to that entering from the drainage channels.

The final decision on the sump type in cases where ground conditions are unknown should be delayed until excavation is undertaken.

IMPORTANT NOTE: If there is any concern as to whether there is a risk of de watering the ground to a condition whereby the structure as a whole could or may be undermined, then advice should be sought from a chartered engineer.

Drainage Channel

If the Triton® Aqua Channel cannot be formed / inserted into the floor at the wall/floor junction, because there are in-situ reinforcing bars in the slab.

Then either a fall must be created in the floor (as previously described under the heading falls) or a series of small surface channels (cut into the floor like chevrons) must be formed with a fall towards the direction of the sump/water collection chamber.

Existing Plasters

Plaster that may be affected by being closed in behind the Cavity Membrane, such as gypsum or lightweight plaster, or where the existing plaster is loose or de-bonding, should be removed from walls / soffits prior to membrane application.

Only where dense and well adhered sand and cement renders are present and where removal may cause unwanted structural damage to substrates can they be left in place.

Preparation

One of the benefits of using cavity drain membrane is that in general, very little preparation to the substrates is required and although the cavity membrane is flexible and does not need a perfect surface for application, the following points need to be considered.

  • Unsound materials on the surface like renders or plasters need to be removed. Any organic materials such as wallpaper, timber skirtings, fixing grounds etc need to be removed.

  • A specialist Timber Treatment contractor should investigate any fungal decay / infestations in timbers. Also timber that is in contact with damp masonry should be removed or physically isolated.

  • Excessively uneven wall and floor surfaces should be dubbed out/levelled especially if timber battens are to be fixed to support dry lining board. Where a wooden floor finish is required such as T&G flooring grade chipboard, it must also be borne in mind that the membrane will follow the contours of the floor. Therefore to achieve a flat surface, any depressions or undulations must be ironed out to avoid undue movement in the floor finishes.

  • Substrates must be free of sharp protruding objects and debris etc that can damage the membrane. We would also recommend that where mould, mosses, lichens and algae has affected substrates, sterilisation with a surface biocide should be used.

  • Loose, friable or defective masonry should be repaired to ensure a solid fixing.

  • New concrete should be treated with Platinum Lime Inhibitor which prevents free lime from the curing concrete being drawn out by ingressing water.

Installation

Internal Basement Structures:

Set out below is a generic method of installation, which can be used to apply Cavity Drain Membranes continuously between wall and floor.

NB it is assumed by this stage, that the site and design considerations mentioned earlier in this document, have been assessed and the type of drainage facility chosen has been tested.

Wall Applications:

The installation of Platinum CV8 Membrane can be fixed to walls either vertically or horizontally, but when choosing the method of application, consideration should be given to the height of walls in relation to the size of the roll of membrane.

There are fewer joints in horizontal applications but it can be awkward and difficult to manoeuvre the weight of a full roll of membrane. Particularly in situations where the membrane has to be taken in and out of numerous recesses, also around convoluting junctions or were walls are not square.

Vertical application may have more joints and require more Waterseal Tape, but this method is more manageable and much easier to fix.

Platinum CV8 Membrane is fixed to walls with Brick Plugs & Sealing Washers. This will form a seal with the membrane when the plug is driven home into the substrate.

If the ceiling height is constant, measure and cut drops of the membrane to completely cover the wall areas to be treated. Place the membrane against the wall as level as possible by eye sight and in the top right or left hand corner (depending on which way around the room the membrane is being taken) drill a hole through the centre of the membrane stud using a 10mm drill bit.

Insert the brick plug and hammer home the plug till it finishes flush with the membrane.

Using a spirit level, level out the membrane and then drill and fix another Brick Plug in the same manner approximately 1.5M along the top of the sheet and along the same line of stud as the first fixing.

Offer up the next length of membrane and position the flange over the studs of the first sheet and fix with two Brick Plugs at high level as previously described.

Continue on in this manner, ensuring the membrane stays as level as possible until all the walls are covered. These independent membrane drops will relax after a while and hang flatter to the wall. The drops are now ready for the next step.

Thoroughly clean the flange and the studs where the seal is to be made, (the best cleaning material is Paper Towel). Any dust or dirt will compromise the integrity of the sealed joint. If the membrane is covered in plaster or brick dust, wash off with clean fresh water only and allow to dry. DO NOT use soap or detergents, as these will leave traces on the membrane, which may affect the seal at a later date or make sealing more difficult.

The separate membrane drops should now be sealed together using Waterseal Tape. Apply the tape to the stud area below, which the flange will cover and press home onto the area between the studs.

Flick over the flange section to cover the tape line, and check for uniformity of cover on tape line. Remove the tape backing paper, starting from the middle section of the wall drop, forming two backing paper tags, one going up and the other down.

On the exposed section of tape apply hand pressure only to the flange to form an initial seal. Carry on to form the seal from the centre section of membrane working up to the top, then go back to the centre and repeat the operation going downwards.

Sealing in this manner will prevent any buckling between the membrane or stress concentration at the joint. In very cold or humid conditions a hot air gun can be used to obtain a good sealed joint.

Now that the membrane is sealed to form one continuous sheet, Brick Plugs can now be fixed through the membrane in position to accommodate the chosen dry lining system.

NOTE: Although a 10mm Drill Bit is the correct size to use, in very soft brickwork this can result in loose fixing. In these circumstances, it is useful to have on hand drill sizes down to 8mm Drill Bit and experiment with different sizes for the best results.

Floor Applications:

Begin at one side of the room and unroll the Floor Membrane against the Wall Membrane with the studs facing down onto the floor.

Allow for the membrane flange overlap, cut the membrane to the desired length or width of the floor. Repeat this exercise until all the lengths / widths required to cover the floor area have been cut.

Roll out the next length/sheet of membrane and position the flange over the studs of the first sheet laid and thoroughly clean the flange and the studs where the seal is to be made as previously described for wall application.

Apply Waterseal Tape to the stud area below which the flange will cover and press home onto the area between the studs.

Flick over the flange section to cover the tape line, and check for uniformity of cover on tape line. Remove the tape backing paper, starting from the middle section of the membrane sheet, and peel off backing paper in opposite directions along the flange. On the exposed section of tape apply hand pressure only to the flange to form an initial seal. Carry on forming the seal working away from the centre of the membrane.

Foot pressure can be applied by sliding the sole of the foot over the membrane joint, to ensure that the membranes are fully bonded. Sealing in this manner will prevent any buckling between the membrane or stress concentration at the joint.

In very cold or humid conditions a hot air gun can be used to obtain a good sealed joint.

The next stage of the operation is to link the floor membrane to the wall membrane, which can be achieved, using Corner Strip / Overtape. Using the Overtape, work out how many linear metres there are around the walls, the Overtape is supplied in manageable 5M, 10M or 20M Lengths.

The Overtape is folded in half along the length of the piece to be used and positioned with the crease into the angle as described for the wall / floor junction.

Once correctly aligned, carefully pull off the backing paper and press firmly out with the palm of the hand onto the floor and wall membranes.

Flat Soffit Application:

Platinum CV8 should not be fixed to the under side of a flat soffit unless a fall exists or a fall can be created in the soffit itself.

The soffit should first be measured to establish the desired lengths or widths of membrane required to cover the area and then a further 200mm of membrane should be added to the measurements, to allow for the membrane to be lapped down all the peripheral walls.

Apply Waterseal Rope to Brick Plugs, then around the perimeter edges of the membrane, fold the membrane inward 200mm to form a positive creased and create a down lap. Offer the membrane up to the soffit and position the down lap creases into the junction between the soffit and wall.

Drill and fix enough Brick Plugs through the membrane and into the soffit to hold the membrane in place with the studs against the soffit.

NB: Wherever the soffit membrane meets the wall, a 200mm down lap must be allowed and formed as above.

Offer the next length/sheet of membrane up to the soffit and position the flange over the studs of the first sheet, fix and secure the membrane as described above. Repeat this operation until all the membrane sheets are held in place.

Thoroughly clean the flange and the studs where the seal is to be made as previously described for wall application.

Apply Waterseal Tape to the stud area, which the flange will cover and press home onto the area between the studs. The membrane should now be sealed to form one continuous sheet, Brick Plugs can now be fixed through the membrane, in positions to accommodate the chosen dry lining system.

NOTE: It is important to ensure that the membrane is taut against the soffit and doesn’t sag, otherwise water ponding will occur and the membrane/seals could fail.

Internal and external corners are formed in exactly the same way as that which has been previously described in ‘Floor Applications' using Platinum CV8 with membrane upstand except in this case, they will be formed in reverse and be upside down.

Service Entry Seals:

Where there are services such as pipes, ducting or steel stanchion that protrude through walls or floors, the membrane should be carefully cut and trimmed around the obstacle and sealed using a combination of Waterseal Rope or Newton Mastic and Corner Strip.

Doors and Windows:

Door and Window Frames and timber surrounds should always be removed to enable the membrane to be extended around or into door and window reveals to maintain the continuity of the waterproofing system and to also provide a physical barrier between the frames and damp masonry.

In situations where the membrane would restrict or limit the profile of replaced frames, then Plain DPC can be used to line and protect the reveals instead.

Ventilation - Part F of Building Regulations:

There is no requirement to ventilate the membrane cavity in a fully sealed system such as in under pavement vault application.

In a semi sealed system, the cavity between membrane and substrate can be vented into the room space with passive vents or if this is not possible, it can be vented through the external wall using a 150 x 225 air brick inserted every 1.5M to 2.0M along the wall.

It is important that the cavity between the membrane and internal finish i.e. dry lining is not vented so as to avoid possible interstitial condensation. However, consideration should be given to the risk of condensation forming within the room itself and the introduction of a humidistat controlled extract fan should therefore be recommended.

Refer to BS8102 (2009) Table 2 for further reference. Part F of Building Regulations concerning ventilation in basements.

Finishing

Wall Finishes:

If timber battens are to be used, the traditional method is to fix a vertical batten 25mm x 50mm.

The Brick Plugs in this instance should be fixed at 400mm centres horizontally and 600mm centres vertically. Platinum Brick Plugs will take 25mm of screw, so be sure to purchase the correct length for the thickness of batten.

NB: We would however, recommend that foil back plasterboard be used to prevent interstitial condensation forming in the cavity.

For a metal fast track dry lining system such as Gypliner or Lafarge, the brick plugs should be fixed at 600mm centres horizontally and 800mm centres vertically. If an independent timber or metal frame system is to be used, the wall membrane can be ‘curtain hung’. The membrane is simply dressed down the walls just like hanging a curtain or sheet. This method of installation requires less fixings.

NOTE: We would however, recommend that foil back plasterboard be used to prevent interstitial condensation forming in the cavity.

Floor Finishes:

There is a wide choice of floor coverings that can be laid on top of floor membrane

Platinum CV8 (Wood Based Flooring) Flooring Grade T & G Chipboard, Parquet, Laminate, Wood Strip
Platinum CV8 (Sand / Cement Screeds)

Domestic: Minimum 50mm screed or 20mm reinforced polymer modified self-levelling screed.

Industrial: Minimum 75mm reinforced screed or 35mm reinforced polymer modified self-levelling screed.

Insulation:

For Platinum CV8 Membrane applied to walls at or above ground level, the maximum insulation thickness should be 50mm.

When Platinum CV8 membrane is applied to earth retaining walls full height of a basement, there is no upper limit to insulation thickness. However, if Platinum CV8 Membrane is applied to part earth retaining walls, then the maximum insulation thickness should be 50mm.

There is no upper limit to insulation thickness for membrane applied to solid floors at ground or below ground level.

Curved Soffits and Vaulted Rooms:

When working in a conventional vault with rounded ceilings the water can run off freely and the following method should be adopted:

When lining vaults always work from the front to the back, starting on the centre line of the vault. Measure the length of the vault and add 400mm to this measurement, then cut the membrane to the length.

Form a 900 downturn crease 200mm in from either end of the membrane and prepare the Brick Plugs by wrapping with Waterseal Rope.

Offer the membrane up to the vault ceiling along the centre line of the vault, and drill and hammer home the fixing plugs in a straight line at 600mm centres from front to rear. These will provide fixing points for the dry lining system.

The creased downturn at either end of the vault will start to deform going into the curvature of the vault ceiling. Where this occurs, carefully slit / cut the deformed sections towards the crease but stop short of the crease by one stud.

The membrane can now be overlaid and will flatten out and follow the curvature. Several slits may be required to achieve this depending on the radius of the vault.

Continue to work out from the first sheet, ensuring a weathered joint of not less than eight studs. The flange should be used to make both of these weathered joints either side of the initial membrane fixed off the central line of the vault. 

The weathered joints are sealed flange over stud using Waterseal Tape.

All the sheets running from front to back of the vault are cut overall length of vaulted soffit. This should give coverage to the vault, past the springing line down to the floor slab line, together with a 200mm return to either end of the vault.

The end walls are now ready to be lined with the membrane. The end wall sections are cut to the true width of the vault so that the membrane overlaps the membrane returns already formed. These sections of membrane are fixed and sealed in exactly the same way as described for wall application. The end wall membrane stud to stud joint should be sealed around the radius with Waterseal Rope and if necessary Corner Strip / Overtape.

The floor membrane is now ready to be laid over the completed drainage system.

Technical Data
Membrane Material HDPE
Sheet Thickness Nominal 0.50mm
Stud Height Approx. 6.5mm
Construction Height Approx. 7mm
Unit Weight 450g/m²
Deformation Under Long Term Loading Max. 20% (at 50 kN/m²)
Compressive Strength 150 kN/m²
Working Temperature -10° to +60°C
Softening Temperature +160°C
Linear Coefficient of Thermal Expansion 0.18mm/m.°C
Water Vapour Resistance 280m equivalent air layer
Air Gap Volume 4.0L/m²
Drainage Capacity Approx. 3.8L/m²
No. of Studs (Approx) 1640 per m²
Life Expectancy At Least 50 Years for Defined Applications
Colour Natural

Platinum CV8 is CE marked in accordance with EN 13967 and EN 13984. 

Data Sheets

Technical Data Sheet

 

£120.00 ex. VAT | £144.00 inc. VAT

Platinum CV8-MESH Cavity Drain Membrane (8mm Stud)
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Platinum CV8-MESH Cavity Drain Membrane (8mm Stud)

£265.00 ex. VAT | £318.00 inc. VAT

Platinum CV8-MESH Cavity Drain Membrane (8mm Stud)

Platinum CV8-MESH Cavity Drain Membrane (8mm Stud)

Platinum Building Chemicals Ltd | Waterproofing Membranes

Cavity Drain Membranes Waterproof Membranes

Platinum CV8-Mesh is a high quality Cavity Drain Waterproofing Membrane comprising of high density polyethylene membrane with a strong polyethylene mesh heat-welded during the manufacturing process to the surface of one side. 

The meshed surface creates a mechanical key to allow the membrane to be plastered, rendered or to receive dot & dab plasterboard.

Platinum CV8-Mesh is suitable for the waterproofing of earth retained walls and vaulted soffits and is guaranteed against deterioration for 30 years, with a life expectancy of the design life of the building (DIN 9001:2000).

Platinum CV8-Mesh is inert and, therefore, non-polluting to drinking water, highly resistant to water, alkalines, saline solutions and organic acids, and not affected by minerals and hydrocarbons. It is also rot-proof, and resistant to bacteria, fungi and other small organisms.

Platinum CV8-Mesh has many benefits and features:

  • Does not require extensive and damaging preparation to the wall surface
  • Speed of installation
  • Superb ‘key’ for renders or plasters
  • Resistant to rot, chemically aggressive groundwater, acids and alkalines, efflorescent salts and hydrocarbon contamination

Available in various Roll sizes ranging from 10M² to 40M².

Preparation

Platinum CV8-Mesh can be installed over a wide range of substrates in varying situations - walls, ceilings, soffits, etc. However, before the system is installed, the area must be assessed to determine what preparation is required:

All timber and other organic material must be removed to prevent risk of fungal or bacterial growth behind the System, e.g. skirting boards, timber plates, old wallpaper etc. If evidence of rot exists, this must be dealt with by a specialist contractor prior to installation of the system (See our Woodworm & Dry Rot Control Products). If any mould, etc. exists, this should be cleaned off and the area sterilised with a Fungicidal Wash.

If the walls are uneven or areas have deteriorated, any large depressions should be levelled and made good to ensure a solid fixing

When fixing the system to flat soffits you must ensure that there is a fall to create proper drainage and prevent ponding. Any sagging of the membrane should not be great enough for ponding to take place

New concrete should be treated with Platinum Lime Inhibitor which prevents free lime from the curing concrete being drawn out by ingressing water.

Application

Application on Walls:

Platinum CV8-Mesh is fixed with the studs against the wall to create an air / depressurisation gap.

The membrane can be fixed either vertically or horizontally. However as this product is not available in 2.4M height and also due to the heavy weight of the material, most fixing of Platinum CV8-Mesh will be Vertical.

When making this decision, you will need to take into account the size of the area to be lined, and the height of the walls relative to the width of the membrane.

Horizontal Fixing requires less cuts and jointing but the full roll is very heavy at first. Vertical fixing has much lighter strips to fix, but requires that each of these is taped back together again. You may find that vertical fixing is easier, but requires more Waterseal Tape for jointing.

The membrane is fixed to the wall using Platinum Brick Plugs & Seals.

Place the membrane in position as level as you can judge by eye. Using a 10mm drill bit, drill through the centre of a stud near the top and edge to a depth greater than the fixing.

The fixing is then hammered into the pre-drilled hole until the plug sits flush in the stud. The rubber washer re-seals the hole. Level the membrane using the spirit level or laser level if used, and fix another plug about 2 metres along at the top of the sheet. The membrane will now be hanging level to the wall.

If you are fixing horizontally, continue fixing every 2 metres until you have reached the end of the roll or you have covered all of the wall(s) to be treated. It is very important to regularly check the level. If the membrane is not level, you may well find that the membrane is kinked and looks unsightly, it will also dive down when fitted around corners.

If you are fixing Vertically, hang each subsequent sheet by the two fixings as described above. The subsequent sheet is joined by overlapping the edge of one sheet by another underneath by a minimum of 2 studs. Fix Brick Plugs & Seals through the studs as close as possible to the edge of the membrane.

Apply Platinum Mesh Tape along the joint with equal overlaps of the tape onto each sheet of membrane and press firmly into place.

Apply more pressure with the palm of your hand to further seal the whole of the joint. A Hot Air Gun should be used to help sealing, especially in cold or damp conditions.

Fixing Centres:

Fix in a square at 350mm centres, and then fix a plug in the centre of four fixings so it looks like a 5 on a dice.

All fixings will then be a maximum of 250mm centres.

On very flat walls, the horizontal and vertical centres can be moved out to 400mm so when the centre plug is fixed, the centres are not more than 300mm.

Finishing

Platinum CV8-Mesh Membrane can be plastered or rendered, or can be plasterboarded using a dab fix.

Plasters:

The recommended plaster to be applied to Platinum CV8-Mesh is Tarmac Whitewall which should be in two coats when applied to Platinum Mesh Membranes.

The plasters can accept a finishing 3mm skim coat to finish.

Note: Manufacturers recommended drying times may vary according to atmospheric conditions.

Cement Based Renders:

For internal cement renders the mix should be six parts clean sharp sand / one part lime / one part cement. A two-coat application is recommended allowing 7-10 days between coats.

Drying time is important because shrinkage cracks may appear.

A weaker mix of seven or even eight parts sand can be used for the second coat.

Hydraulic Lime Based Mortars:

First Coat

Using a ratio of 1 part Lime to 2½ - 3 parts sharp washed sand with evenly distributed hair throughout the mortar and working to a layer of 10mm thick, push the plaster into and across the pre-wet laths at a 45 degree angle to the lathes.

The plaster should be correctly cured until hard

Second Coat

The second coat also known as the intermediate or float coat will be applied similar to the first coat only without any hair being added to the mortar.

You must ensure you wet down the first coat with a fine mist before spreading a 7mm coat, before scratching up and leaving in preparation of the finish coat.

Finish Coat

For the final top coat a fine mix of 1 part lime putty to 2 parts well graded super fine sand. Remembering to wet down the surface before application with a fine mist spray.

Allow time for the water to absorb into the plaster then apply a coat of approximately 5mm, then rule off and leave for a couple of hours.

When ready, rub up the finish coat using a plastic or wooden trowel to bring back the fat until the required finish has been reached in the case of any light crazing this can be rubbed up and trowelled out.

General Plastering & Rendering Considerations:

Note: All plasters and renders etc. must be to a minimum total depth of 15mm.

The undercoat should be applied with firm pressure to ensure the product is fully pushed behind the mesh so that the studs are fully filled, and to an approximate thickness of 5mm and be well scratched with a wire scratcher.

When the scratch coat has set, the floating coat should be applied to a depth of 7mm and lightly scratched to provide a firm key for the final coat, which should be to a minimum thickness of 3mm.

All plasters and renders should be applied strictly in accordance with the manufacturer’s instructions, and good plastering / rendering practice as described in BS5492 and BS5262 Code of Practice.

Do not apply decoration until the plaster or render is thoroughly dry.

If any special renders or plasters are to be considered, technical advice must be sought from the Company’s technical department.

Curing:

Note: Cement and Lime based mortars require curing. Curing is the process of keeping a mortar or render under a specific environmental condition until the chemical set (referred to as hydration) is sufficient to withstand the environment into which the mortar has been placed.

Lime binders are generally weaker than cements taking longer to acquire their strength and hardness, leaving them potentially more vulnerable for a longer period than cement equivalents, and curing them once placed is simply regarded as best practice.

Good curing is typically considered to be that of providing a humid environment stimulating full hydration of the lime or cement binders, providing strength development along with other benefits, especially the ability to withstand hairline cracking.

The most common cause of failure is allowing a mortar / render to dry out too quickly, impeding the chemical process for hydration, stressing the mortar resulting in cracking.

Standard practice for protecting cement or lime based renders/mortars is with wet / dampened hessian sheeting draped over the area in relatively close proximity to the render. This should be left in place for at least a week and is a standard requirement that is required in all cases.

During the warmer months, the hessian will need to be repeatedly wetted and/or covered with plastic sheeting to ensure the correct curing environment.

Curing should be of at least 7 days.

Dry Lining:

Platinum CV8-Mesh can be effectively used in conjunction with dry lining by dab fixing the plasterboard using a proprietary dabbing compound.

Be careful when installing laminated or insulated plasterboard, as when they are dot & dabbed to Platinum Meshed membranes, building regulations require two mechanical fixes to each laminated board. These fixings may breach the membrane which cannot be repaired.

Where insulation is required to the wall build, we recommend to use a NON-MESHED Membrane (such as Platinum CV8) and use an independent dry-lining frame.

House the insulation within the frame and plasterboard over.

Technical Data
Membrane Material HDPE
Membrane Thickness 0.8mm
Stud Depth 6.6mm
Density 600g/m²
Vicat Softening Temperature 126°C
Service Temperature -40°C to +80°C
Compressive Strength (EN 25619-2) N/A
Thermal Conductivity (EN12667) 0.461 W/mK
Water Vapour Resistance - Sd Value (BS EN 1931) >604m
Water Vapour Resistance - μ Value >1208000μ
Water Vapour Diffusion Resistance >3020 MNs/g
Resistance to Fire (BS EN 13501-1) EuroClass
Chemical Resistance - Excellent (EN 14030) 100%
Oxidation Resistance - Excellent (EN ISO 13438) 100%
Data Sheets

Technical Data Sheet

 

£265.00 ex. VAT | £318.00 inc. VAT

Platinum CV20 Cavity Drain Flooring Membrane (20mm Stud)
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Platinum CV20 Cavity Drain Flooring Membrane (20mm Stud)

£280.00 ex. VAT | £336.00 inc. VAT

Platinum CV20 Cavity Drain Flooring Membrane (20mm Stud)

Platinum CV20 Cavity Drain Flooring Membrane (20mm Stud)

Platinum Building Chemicals Ltd | Waterproofing Membranes

Cavity Drain Membranes Flooring Membranes Waterproof Membranes

Platinum CV20 is a Cavity Drain Waterproofing Membrane made from High Density Polyethylene (HDPE).

With its 20mm deep stud profile, Platinum CV20 is used as a high drainage capacity floor membrane and is generally specified where it is anticipated that there may be a risk of severe water penetration.

Platinum CV20 is guaranteed against deterioration for 30 years, with a life expectancy of at least the design life of the building (DIN 9001:2000).

Platinum CV20 is inert and, therefore, non-polluting to drinking water, highly resistant to water, alkalies, saline solutions and organic acids, and not affected by minerals and hydro-carbons. It is also impervious to root penetration, is rot-proof, and resistant to bacteria, fungi and other small organisms.

Platinum CV20 has many benefits and features:

  • Speed of installation
  • Made from 100% recycled HDPE
  • Resistant to rot, chemically aggressive groundwater, acids and alkalines, efflorescing salts and hydrocarbon contamination

Available in 2.07M x 10M (20M²) and 2.07M x 20M (40M²) Rolls

Preparation

Platinum CV20 should only be used on floors. Before the system is installed, the area must be assessed to determine what preparation is required:

All timber and other organic material must be removed to prevent risk of fungal or bacterial growth behind the System. If evidence of rot exists, this must be dealt with by a specialist contractor prior to installation of the system (See our Woodworm & Dry Rot Control Products).

Brush the floor clean and remove any sharp protrusions. Fill all non-structural cracks above 1mm wide, all structural cracks should be repaired or treated.

New concrete should be treated with Platinum Lime Inhibitor which prevents free lime from the curing concrete being drawn out by ingressing water.

Application

Installation:

It is very rare for water to pass through a solid concrete slab or concrete raft, but where the slab or raft is of questionable quality it is possible for water to pass through cracks in a poorly constructed floor. If the quality of the slab is questionable, Platinum CV20 should be used as the floor membrane.

Starting at one side of the room, unroll the membrane with the studs down and cut to fit the room as one would a carpet. The next membrane width is rolled out so that the flanged edge overlaps onto the edge of the previous roll of membrane. Clean both edges.

Platinum Waterseal Tape is then applied to the high flat area between the first two studs at the edge of the previous roll of membrane with the backing paper still intact.

Check the two widths for alignment, with the flange covering the backing paper.

Starting from the end of the joint, remove the backing paper and press down on the joint sealing the two sections together. This process is repeated until all areas are covered. Seal the Platinum CV20 Membrane to the up-stand of the perimeter drainage channel (i.e Triton® Aqua Channel / Newton® Basedrain) with Platinum Corner Strip / Overtape.

Where the floor membrane is required to be jointed to horizontal DPC’s through internal and external walls, these joints should be sealed with Platinum Waterseal Tape. Ensure both surfaces are clean and dry before attempting to make these joints.

If there are any services up through the floor, the membrane can be cut and trimmed around them, and the gap filled and sealed using a high quality MS or SMX Polymer Adhesive.

If necessary, a patch of membrane or plain DPC is laid over and sealed to the service with Platinum Waterseal Rope, and around its perimeter with Platinum Waterseal Tape.

It should be noted that protrusions through the floor slab/raft should be avoided wherever possible as they create weaknesses that allow unnecessary water ingress.

The specified floor finish can now be laid directly over the floor membrane, which must not be punctured by any fixings through the floor. When a timber floor finish is preferred you must allow an expansion gap around the wall edge.

Speak to the supplier of the floor finish to confirm the correct size of this expansion gap.

Technical Data
Membrane Material HDPE
Membrane Thickness 1.0mm
Stud Depth 19.0mm
Density 1000g/m²
Vicat Softening Temperature 126°C
Service Temperature -40°C to +80°C
Compressive Strength (EN 25619-2) 240 kpa
Thermal Conductivity (EN12667) 0.461 W/mK
Water Vapour Resistance - Sd Value (BS EN 1931) >604m
Water Vapour Resistance - μ Value >1208000μ
Water Vapour Diffusion Resistance >3020 MNs/g
Resistance to Fire (BS EN 13501-1) EuroClass
Chemical Resistance - Excellent (EN 14030) 100%
Oxidation Resistance - Excellent (EN ISO 13438) 100%
Radon Gas Resistance - Membrane* (K124/02/95) N/A
Radon Gas Resistance - Joints* (K124/02/95) N/A
Resistance to Liquid Hydrocarbons* (EN 16140:2011) N/A
Carbon Dioxide Permeability* N/A
Methane Permeability* N/A
Carbon Dioxide Transmission Rate (ISO 15105-1) N/A
Methane Transmission Rate (ISO 15105-1) N/A
Data Sheets

Technical Data Sheet

 

£280.00 ex. VAT | £336.00 inc. VAT

Isola Platon® P8 Cavity Drain Membrane (8mm Stud)
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Isola Platon® P8 Cavity Drain Membrane (8mm Stud)

£120.00 ex. VAT | £144.00 inc. VAT

Isola Platon® P8 Cavity Drain Membrane (8mm Stud)

Isola Platon® P8 Cavity Drain Membrane (8mm Stud)

Isola | Waterproofing Membranes

Cavity Drain Membranes Waterproof Membranes

Platon® P8 Cavity Drain Membrane is manufactured from high-density polyethylene (HDPE) for use within System Platon®, Isola's internally applied Waterproofing System that includes the Aqua Channel Drainage System and Aqua Pumping Systems.

Platon® P8 impermeable and resistant to the usual chemicals in the building construction. Studs are formed in a regular pattern on the one face of the product. The studs are spaced at approx. 25mm centres in both directions.

Platon® P8 is CE marked in accordance with EN 13967 and EN 13984. A separate declaration gives values for several characteristics.

Platon® P8 membrane is tough but pliable and can be bent round corners and projections without risk of breaking, even in very low temperatures. The product can be easily cut with a knife or scissors.

  Platon® P8 is supported by BBA Certification Certificate Number 01/3823.

Available in various Roll sizes ranging from 10M² to 40M².

Design Consideration

Membrane Suitability:

Platon® Cavity Drain Membrane can be applied to almost all sound building structures below ground, which are affected by dampness or water ingress. However, they are not recommended for installation in the following situations.

  • Where the Cavity Membrane System cannot be drained, otherwise the system will fail.

  • Fixed onto internal flat soffits unless the soffit has an existing fall or a fall can be formed at the design stage (in the case of new build construction) or created using sand & cement renders, otherwise water would pond behind the membrane and build up like a balloon. The weight of water would inevitably burst the membrane seals, which are not designed to hold water under pressure.

  • Under or on top of concrete/stone staircase treads and risers, because of the many convoluting junctions and angle details. In such circumstances, we recommend they be treated independently using an epoxy vapour barrier.

Ingressing Water:

Platon® Cavity Drain Membranes are capable of dealing with (quite) large volumes of water, so ingressing water will not usually require remedial action. But if the flow rate is such that it will be able to carry silts/dissolved lime with it, then this inflow should be stemmed/controlled prior to fitting the membrane. This can be achieved as follows.

  • If ingressing water is localised then the application of Water-Stop Plugging Compound will often be sufficient.

  • If ingressing water is more general and cannot be dealt with by localised plugging, consideration should be given to applying a general coat of 3:1 render incorporating an accelerator in the mix.

When water is flowing through concrete or mortar (particularly when it is new) there is a tendency for dissolved lime to be brought into the cavity.

This lime can then come out of solution and block up cavities and drains. If this is a risk, then the source of water ingress needs to be treated in the same way as silt bearing water, as described above.

NB: Regardless of conditions at the time of inspection, BS 8102 says it must be assumed hydrostatic pressure is going to occur at some time during the lifetime of the basement. This means that some form of water removal system must always be fitted with a Platon® Cavity Membrane in below ground structures.

Drainage Types:

There are two principle forms of drainage, these are natural (gravity) and mechanical (sump & pump) and can be used in conjunction with falls or drainage channels.

However, when assessing the type of drainage facility to be used and because the drainage is the key to the success of the cavity membrane system, it is important to take into consideration the following points.

Natural - (Combined Foul Chambers & Integral Gullies)

Where drainage with gravity is feasible within the bounds of the property or at a point of exit from the property, it is most important to establish that the ‘internal drainage’ is in good working order and to question whether the local drains are connected to public drains or a soakaway.

Drains can and do block up or back up causing flooding, including escape of foul waste and pungent smells.

Soakaways can also fill up during periods of heavy rain, which would lead to flooding and failure of the cavity membrane system.

In situations where the Platon® membrane installer finds that the only possibility of draining the cavity membrane is into a foul / soakaway system or his client so instructs, liability for the waterproofing system should therefore be excluded in the event of blockage of the foul pipes or the soakaways filling up. We, and the products Manufacturer, always recommend the inclusion of sump and pumps.

Mechanical - (Sump & Pump)

Platinum Chemicals offer an off-the-shelf sump and pump drainage system, The Aqua Pump Range and ‘Aqua Pump Pro Range’ which has been specifically  designed for the purpose of controlling ground water ingress.

The simple to fit sump pump kit comprises a polyethylene pre-formed sump chamber with a structural lid. The submersible Aqua Pump is controlled by an automatic integral float switch and comes with a non-return valve and a high level water alarm that warns of mechanical or power failure.

However, it would be prudent to install a double pump system ‘The Aqua Pump Plus Kit’ which consists of two pumps in the sump chamber. This secondary pump would provide a back up in case of mechanical failure of the principal pump.

Consideration should also be given to installing a Battery Back-up Pump in case of a power failure and is also available from Platinum Chemicals.

Drainage Channel - (Triton® Aqua Channel Drainage System)

Platinum Chemicals also offer Triton® Aqua Channel, which is a PVC drainage conduit specifically designed for the control of water ingress in below ground situations.

It is fitted around the perimeter of the floor at the vulnerable wall / floor junction and can be used in most waterproofing situations, and is particularly suited for use in conjunction with Platon® Cavity Drain Membrane Systems.

Water entering the building through the walls is controlled behind the Platon® Membrane and diverted to the Aqua Channel at the base of the wall. The water enters the Aqua Channel through pre-drilled drainage holes and must then be diverted to a suitable drainage point, either natural or a sump and mechanical pump. Rodding Eyes can also be incorporated into the Aqua Channel.

Falls - (Floors)

It is essential that there are no undulating surfaces or depressions in the floor. In new build or whenever floors are being replaced, the floor slabs can be designed and constructed to falls 2º or 3º towards the water collection facility, i.e. sump chamber.

Where an existing solid floor is to be retained a sand/cement screed can be laid over the entire floor gently sloping towards the sump. In all cases the floor should always be tested by spraying with a hose, to ensure that all water finds its way to the water collection point before laying the cavity membrane.

Note: Wherever possible (head height permitting) we recommend that Platon® P20 be used on floors. This is because the Platon® P20 Membrane has a far greater drainage capacity and significantly reduces the risk of hydrostatic pressure building up within the cavity.

Undermining Structures:

Sump Chambers

Consideration must be given to the implications of fitting sumps in the ground, e.g. where unstable elements are present, such as chalk or sand.

The installation of a perforated sump chamber could cause washing away and potential undermining. Therefore, in such cases, only sealed sumps should be installed and structurally held in place by concrete etc, with the water collection limited to that entering from the drainage channels.

The final decision on the sump type in cases where ground conditions are unknown should be delayed until excavation is undertaken.

IMPORTANT NOTE: If there is any concern as to whether there is a risk of de watering the ground to a condition whereby the structure as a whole could or may be undermined, then advice should be sought from a chartered engineer.

Drainage Channel

If the Aqua Channel cannot be formed / inserted into the floor at the wall/floor junction, because there are in-situ reinforcing bars in the slab.

Then either a fall must be created in the floor (as previously described under the heading falls) or a series of small surface channels (cut into the floor like chevrons) must be formed with a fall towards the direction of the sump/water collection chamber.

Existing Plasters

Plaster that may be affected by being closed in behind the Platon® Cavity Membrane, such as gypsum or lightweight plaster, or where the existing plaster is loose or de-bonding, should be removed from walls / soffits prior to membrane application.

Only where dense and well adhered sand and cement renders are present and where removal may cause unwanted structural damage to substrates can they be left in place.

Preparation

One of the benefits of using cavity drain membrane is that in general, very little preparation to the substrates is required and although the cavity membrane is flexible and does not need a perfect surface for application, the following points need to be considered.

  • Unsound materials on the surface like renders or plasters need to be removed. Any organic materials such as wallpaper, timber skirtings, fixing grounds etc need to be removed.

  • A specialist Timber Treatment contractor should investigate any fungal decay / infestations in timbers. Also timber that is in contact with damp masonry should be removed or physically isolated.

  • Excessively uneven wall and floor surfaces should be dubbed out/levelled especially if timber battens are to be fixed to support dry lining board. Where a wooden floor finish is required such as T&G flooring grade chipboard, it must also be borne in mind that the membrane will follow the contours of the floor. Therefore to achieve a flat surface, any depressions or undulations must be ironed out to avoid undue movement in the floor finishes.

  • Substrates must be free of sharp protruding objects and debris etc that can damage the membrane. We would also recommend that where mould, mosses, lichens and algae has affected substrates, a surface sterilisation with TRISOL 23 should be used.

  • Loose, friable or defective masonry should be repaired to ensure a solid fixing.

  • New concrete should be treated with Platinum Lime Inhibitor which prevents free lime from the curing concrete being drawn out by ingressing water.

Installation

Internal Basement Structures:

Set out below is a generic method of installation, which can be used to apply Platon® Cavity Drain Membranes continuously between wall and floor.

NB it is assumed by this stage, that the site and design considerations mentioned earlier in this document, have been assessed and the type of drainage facility chosen has been tested.

Wall Applications:

The installation of Platon® P8 Membrane can be fixed to walls either vertically or horizontally, but when choosing the method of application, consideration should be given to the height of walls in relation to the size of the roll of membrane.

There are fewer joints in horizontal applications but it can be awkward and difficult to manoeuvre the weight of a full roll of membrane. Particularly in situations where the membrane has to be taken in and out of numerous recesses, also around convoluting junctions or were walls are not square.

Vertical application may have more joints and require more Waterseal Tape, but this method is more manageable and much easier to fix.

Platon® P8 Membrane is fixed to walls with Brick Plugs & Sealing Washers. This will form a seal with the membrane when the plug is driven home into the substrate.

If the ceiling height is constant, measure and cut drops of the membrane to completely cover the wall areas to be treated. Place the membrane against the wall as level as possible by eye sight and in the top right or left hand corner (depending on which way around the room the membrane is being taken) drill a hole through the centre of the membrane stud using a 10mm drill bit.

Insert the brick plug and hammer home the plug till it finishes flush with the membrane.

Using a spirit level, level out the membrane and then drill and fix another Brick Plug in the same manner approximately 1.5M along the top of the sheet and along the same line of stud as the first fixing.

Offer up the next length of membrane and position the flange over the studs of the first sheet and fix with two Brick Plugs at high level as previously described.

Continue on in this manner, ensuring the membrane stays as level as possible until all the walls are covered. These independent membrane drops will relax after a while and hang flatter to the wall. The drops are now ready for the next step.

Thoroughly clean the flange and the studs where the seal is to be made, (the best cleaning material is Paper Towel). Any dust or dirt will compromise the integrity of the sealed joint. If the membrane is covered in plaster or brick dust, wash off with clean fresh water only and allow to dry. DO NOT use soap or detergents, as these will leave traces on the membrane, which may affect the seal at a later date or make sealing more difficult.

The separate membrane drops should now be sealed together using Waterseal Tape. Apply the tape to the stud area below, which the flange will cover and press home onto the area between the studs.

Flick over the flange section to cover the tape line, and check for uniformity of cover on tape line. Remove the tape backing paper, starting from the middle section of the wall drop, forming two backing paper tags, one going up and the other down.

On the exposed section of tape apply hand pressure only to the flange to form an initial seal. Carry on to form the seal from the centre section of membrane working up to the top, then go back to the centre and repeat the operation going downwards.

Sealing in this manner will prevent any buckling between the membrane or stress concentration at the joint. In very cold or humid conditions a hot air gun can be used to obtain a good sealed joint.

Now that the membrane is sealed to form one continuous sheet, Brick Plugs can now be fixed through the membrane in position to accommodate the chosen dry lining system.

NOTE: Although a 10mm Drill Bit is the correct size to use, in very soft brickwork this can result in loose fixing. In these circumstances, it is useful to have on hand drill sizes down to 8mm Drill Bit and experiment with different sizes for the best results.

Floor Applications:

Begin at one side of the room and unroll the Floor Membrane against the Wall Membrane with the studs facing down onto the floor.

Allow for the membrane flange overlap, cut the membrane to the desired length or width of the floor. Repeat this exercise until all the lengths / widths required to cover the floor area have been cut.

Roll out the next length/sheet of membrane and position the flange over the studs of the first sheet laid and thoroughly clean the flange and the studs where the seal is to be made as previously described for wall application.

Apply Waterseal Tape to the stud area below which the flange will cover and press home onto the area between the studs.

Flick over the flange section to cover the tape line, and check for uniformity of cover on tape line. Remove the tape backing paper, starting from the middle section of the membrane sheet, and peel off backing paper in opposite directions along the flange. On the exposed section of tape apply hand pressure only to the flange to form an initial seal. Carry on forming the seal working away from the centre of the membrane.

Foot pressure can be applied by sliding the sole of the foot over the membrane joint, to ensure that the membranes are fully bonded. Sealing in this manner will prevent any buckling between the membrane or stress concentration at the joint.

In very cold or humid conditions a hot air gun can be used to obtain a good sealed joint.

The next stage of the operation is to link the floor membrane to the wall membrane, which can be achieved, using Corner Strip / Overtape. Using the Overtape, work out how many linear metres there are around the walls, the Overtape is supplied in manageable 5M, 10M or 20M Lengths.

The Overtape is folded in half along the length of the piece to be used and positioned with the crease into the angle as described for the wall / floor junction.

Once correctly aligned, carefully pull off the backing paper and press firmly out with the palm of the hand onto the floor and wall membranes.

Flat Soffit Application:

Platon® P8 should not be fixed to the under side of a flat soffit unless a fall exists or a fall can be created in the soffit itself.

The soffit should first be measured to establish the desired lengths or widths of membrane required to cover the area and then a further 200mm of membrane should be added to the measurements, to allow for the membrane to be lapped down all the peripheral walls.

Apply Waterseal Rope to Brick Plugs, then around the perimeter edges of the membrane, fold the membrane inward 200mm to form a positive creased and create a down lap. Offer the membrane up to the soffit and position the down lap creases into the junction between the soffit and wall.

Drill and fix enough Brick Plugs through the membrane and into the soffit to hold the membrane in place with the studs against the soffit.

NB: Wherever the soffit membrane meets the wall, a 200mm down lap must be allowed and formed as above.

Offer the next length/sheet of membrane up to the soffit and position the flange over the studs of the first sheet, fix and secure the membrane as described above. Repeat this operation until all the membrane sheets are held in place.

Thoroughly clean the flange and the studs where the seal is to be made as previously described for wall application.

Apply Waterseal Tape to the stud area, which the flange will cover and press home onto the area between the studs. The membrane should now be sealed to form one continuous sheet, Brick Plugs can now be fixed through the membrane, in positions to accommodate the chosen dry lining system.

NOTE: It is important to ensure that the membrane is taut against the soffit and doesn’t sag, otherwise water ponding will occur and the membrane/seals could fail.

Internal and external corners are formed in exactly the same way as that which has been previously described in ‘Floor Applications' using Platon® P8 with membrane upstand except in this case, they will be formed in reverse and be upside down.

Service Entry Seals:

Where there are services such as pipes, ducting or steel stanchion that protrude through walls or floors, the membrane should be carefully cut and trimmed around the obstacle and sealed using a combination of Waterseal Rope or Newton Mastic and Corner Strip.

Doors and Windows:

Door and Window Frames and timber surrounds should always be removed to enable the Platon® Membrane to be extended around or into door and window reveals to maintain the continuity of the waterproofing system and to also provide a physical barrier between the frames and damp masonry.

In situations where the Platon® Membrane would restrict or limit the profile of replaced frames, then Plain DPC can be used to line and protect the reveals instead.

Ventilation - Part F of Building Regulations:

There is no requirement to ventilate the membrane cavity in a fully sealed system such as in under pavement vault application.

In a semi sealed system, the cavity between membrane and substrate can be vented into the room space with passive vents or if this is not possible, it can be vented through the external wall using a 150 x 225 air brick inserted every 1.5M to 2.0M along the wall.

It is important that the cavity between the membrane and internal finish i.e. dry lining is not vented so as to avoid possible interstitial condensation. However, consideration should be given to the risk of condensation forming within the room itself and the introduction of a humidistat controlled extract fan should therefore be recommended.

Refer to BS8102 (2009) Table 2 for further reference. Part F of Building Regulations concerning ventilation in basements.

Finishing

Wall Finishes:

If timber battens are to be used, the traditional method is to fix a vertical batten 25mm x 50mm.

The Brick Plugs in this instance should be fixed at 400mm centres horizontally and 600mm centres vertically. Platinum Brick Plugs will take 25mm of screw, so be sure to purchase the correct length for the thickness of batten.

NB: We would however, recommend that foil back plasterboard be used to prevent interstitial condensation forming in the cavity.

For a metal fast track dry lining system such as Gypliner or Lafarge, the brick plugs should be fixed at 600mm centres horizontally and 800mm centres vertically. If an independent timber or metal frame system is to be used, the wall membrane can be ‘curtain hung’. The membrane is simply dressed down the walls just like hanging a curtain or sheet. This method of installation requires less fixings.

NOTE: We would however, recommend that foil back plasterboard be used to prevent interstitial condensation forming in the cavity.

 

Floor Finishes:

There is a wide choice of floor coverings that can be laid on top of Platon® floor membranes

Platon® P8 (Wood Based Flooring) Flooring Grade T & G Chipboard, Parquet, Laminate, Wood Strip
Platon® P8 (Sand / Cement Screeds)

Domestic: Minimum 50mm screed or 20mm reinforced polymer modified self-levelling screed.

Industrial: Minimum 75mm reinforced screed or 35mm reinforced polymer modified self-levelling screed.

Insulation:

For Platon® Membrane applied to walls at or above ground level, the maximum insulation thickness should be 50mm.

When Platon® membrane is applied to earth retaining walls full height of a basement, there is no upper limit to insulation thickness. However, if Platon® Membrane is applied to part earth retaining walls, then the maximum insulation thickness should be 50mm.

There is no upper limit to insulation thickness for Platon® Membrane applied to solid floors at ground or below ground level.

Curved Soffits and Vaulted Rooms:

When working in a conventional vault with rounded ceilings the water can run off freely and the following method should be adopted:

When lining vaults always work from the front to the back, starting on the centre line of the vault. Measure the length of the vault and add 400mm to this measurement, then cut the membrane to the length.

Form a 900 downturn crease 200mm in from either end of the membrane and prepare the Brick Plugs by wrapping with Waterseal Rope.

Offer the membrane up to the vault ceiling along the centre line of the vault, and drill and hammer home the fixing plugs in a straight line at 600mm centres from front to rear. These will provide fixing points for the dry lining system.

The creased downturn at either end of the vault will start to deform going into the curvature of the vault ceiling. Where this occurs, carefully slit / cut the deformed sections towards the crease but stop short of the crease by one stud.

The membrane can now be overlaid and will flatten out and follow the curvature. Several slits may be required to achieve this depending on the radius of the vault.

Continue to work out from the first sheet, ensuring a weathered joint of not less than eight studs. The flange should be used to make both of these weathered joints either side of the initial membrane fixed off the central line of the vault. 

The weathered joints are sealed flange over stud using Waterseal Tape.

All the sheets running from front to back of the vault are cut overall length of vaulted soffit. This should give coverage to the vault, past the springing line down to the floor slab line, together with a 200mm return to either end of the vault.

The end walls are now ready to be lined with the membrane. The end wall sections are cut to the true width of the vault so that the membrane overlaps the membrane returns already formed. These sections of membrane are fixed and sealed in exactly the same way as described for wall application. The end wall membrane stud to stud joint should be sealed around the radius with Waterseal Rope and if necessary Corner Strip / Overtape.

The floor membrane is now ready to be laid over the completed drainage system.

Technical Data
Membrane Material HDPE
Sheet Thickness Nominal 0.50mm
Stud Height Approx. 6.5mm
Construction Height Approx. 7mm
Unit Weight 0.45kg/m²
Deformation Under Long Term Loading Max. 20% (at 50 kN/m²)
Compressive Strength 150 kN/m²
Working Temperature -10° to +60°C
Softening Temperature +160°C
Linear Coefficient of Thermal Expansion 0.18mm/m.°C
Water Vapour Resistance 280m equivalent air layer
Air Gap Volume 4.0L/m²
Drainage Capacity Approx. 3.8L/m²
No. of Studs (Approx) 1640 per m²
Life Expectancy At Least 50 Years for Defined Applications
Colour Natural

Platon P8 is CE marked in accordance with EN 13967 and EN 13984. A separate declaration gives values for several characteristics.

Data Sheets

Technical Data Sheet

System Platon® Installation Manual

BBA Certificate

£120.00 ex. VAT | £144.00 inc. VAT

Isola Platon® Plaster Base Membrane (5mm Stud)
Quick Look

Isola Platon® Plaster Base Membrane (5mm Stud)

£192.00 ex. VAT | £230.40 inc. VAT

Isola Platon® Plaster Base Membrane (5mm Stud)

Isola Platon® Plaster Base Membrane (5mm Stud)

Isola | Waterproofing Membranes

Cavity Drain Membranes Damp Proofing Membranes Waterproof Membranes

Platon® Plaster Base is a BBA Approved studded Cavity Drain Membrane for use in both Waterproofing and Damp-Proofing specifications.

The unique patented undercut stud is 'dovetail' shaped which provides a physical key for plaster and render or allows for the direct application of plasterboard on adhesive dabs. This is of particular benefit where space constraints prevent the use of timber or metal frame drylining, the installation of a blockwork liner wall or where a direct render or plaster finish is preferred, i.e a vaulted ceiling. 

Platon® Plaster Base can be used to deal with and provide isolation from Rising or Penetrating Damp, Salt Contamination and Running Water (when used in conjunction with the Aqua Channel Drainage System, Platon® P20 or Platon® P8 (when P8 is used used as the Floor Membrane) and Triton Aqua Pump & Sump Systems.

When used within a fully designed and specified waterproofing design, Platon® Plaster Base can provide a Grade 3 environment, as laid out in BS8102:2009.

Platon® Plaster Base is for use above or below ground and unlike wet or liquid applied forms of ‘tanking’ it can be worked on immediately after installation without waiting for drying or curing to occur.

  • No extensive preparation of structure
  • Water is directed behind the membrane to a drain channel for gravity drainage or a sump for pumped discharge
  • Ingressing water is de-pressurized and managed within the system and not diverted to other areas
  • Complete freedom of choice of wall finishes
  • Rapid and straightforward installation
  • Impermeable to water and water vapour
  • Reliable ‘Type C’ Waterproofing

  Platon® Plaster Base is supported by BBA Certification Certificate Number 01/3823.

Available in various Roll sizes ranging from 10M² to 40M².

Preparation

Platon® Plaster Base can be applied to retained sound renders, brickwork, blockwork, stone or concrete. The quality and appearance of the applied finishes will be a direct reflection of the underlying substrate.

All surfaces must be of a sound, firm nature and any loose areas should be removed prior to application. Uneven, loose, or soft brick/stonework may need to be dubbed out to level off and stabilise the background. Retaining sound cement render can be a good option if the substrate underneath is known to be in poor condition.

Gypsum based plaster, wallpaper and any buried timber must be removed as these materials can deteriorate over time and in the presence of moisture.  Where necessary a fungicide wash should be applied to the wall surface. Platon® Plaster Base should not be used on floors.

Remove loose and soft plaster / render, wallpaper and embedded timbers. Dub out voids, hollows and loose areas of masonry using a cement mortar. Offer up the membrane, hollow studs facing into the room, and fix in place using sealed Plaster Plugs (Sealed using Platinum Waterseal Rope).

Application

Pull the membrane as tightly as possible against the structure to minimise hollow areas behind as these can interfere with the application of plaster or plasterboard.

Use a minimum of 13 fixings per square metre, spaced out in a regular ‘diamond’ pattern no more than 250mm apart. Drill through the membrane in the centre of a 4 stud cluster, rather than through the stud itself. In some cases, additional fixings may be required in order to produce a stable and tight membrane layer.

Fit the membrane tightly into and around corners to avoid damage when applying finishes.

Platon® Plaster Base is joined by overlapping adjacent sheets by a minimum of 2 studs. Fix the Fixing Plugs as close as possible to the edge of the membrane. Fixings should be made at 150mm centres along the joint. Once all fixings are in place, clean the membrane surface thoroughly and ensure it is dry and free from dust.

Apply a Mesh Tape along the joint with equal overlaps onto each sheet of membrane and press firmly into place. If for some reason the membrane edges are in tension or are likely to try and pull apart, reinforce the joint with Corner Strip before applying the Mesh Tape.

Finishing

Most common Lightweight and Renovating Plasters (Tarmac Whitewall) or sand / cement renders can be applied to Platon® Plaster Base. (The use of British Gypsum Hardwall or Tuff Coat is not recommended). When using sand / cement renders, mixes of 1 part cement to 6 parts washed plastering sand, incorporating either SBR or Hydrated Lime should be used. NB Grade ‘M’; medium sharp sand should be used. Do not use soft or building sand.

All renders / plasters should be applied in a minimum of two coats, allowing the 1st coat of 7mm - 10mm to be trowelled firmly into the membrane studs and then scratched to provide a key for subsequent coats to be applied. The first scratch coat should be left to cure and harden. Ideally this should be 7 - 10 days depending on site & atmospheric conditions.

Do not allow the plaster or render to dry out too quickly or cracking may occur. The minimum plaster thickness should be 15mm and the maximum thickness (sand / cement 30mm) (lightweight plasters 40mm).

Plasterboard can be bonded using regular ‘dab’ adhesive or Low Expansion Polyurethane Foam Adhesive (See Soudabond Easy). Apply the adhesive over the heads of the fixing plugs and ensure that 50% of the membrane area is also covered. This ensures that direct ‘through’ contact is made between the plasterboard and the masonry substrate.

Plasterboard fixed in this way can be skimmed the next day and painted or wallpapered a few days after that. Drying times are very much reduced when compared to ‘wet’ systems.

Technical Data
Mambrane Material High Density Polyethylene (HDPE)
Sheet Thickness 0.50mm Approx.
Stud Height 5mm
Roll Weight 19.2 Kg
Air Gap Volume 3.2L/m²
Drainage Capacity 1.84L/m²

 

Data Sheets

Technical Data Sheet

System Platon® Installation Manual

BBA Certificate

£192.00 ex. VAT | £230.40 inc. VAT

Newton® 508 Cavity Drain Membrane (8mm Stud)
Quick Look

Newton® 508 Cavity Drain Membrane (8mm Stud)

£170.00 ex. VAT | £204.00 inc. VAT

Newton® 508 Cavity Drain Membrane (8mm Stud)

Newton® 508 Cavity Drain Membrane (8mm Stud)

John Newton & Co. Ltd | Waterproofing Membranes

Cavity Drain Membranes Waterproof Membranes

Newton® 508 is a high quality 'lightweight' Cavity Drain Waterproofing Membrane for use within Newton® System 500, Newton's internally applied Waterproofing System that includes Newton® Drainage and Pumping Systems.

Newton 508 is suitable for the waterproofing of earth retained walls and vaulted soffits and is guaranteed against deterioration for 30 years, with a life expectancy of the design life of the building (DIN 9001:2000).

Newton 508 is inert and, therefore, non-polluting to drinking water, highly resistant to water, alkalines, saline solutions and organic acids, and not affected by minerals and hydrocarbons. It is also rot-proof, and resistant to bacteria, fungi and other small organisms.

  Newton® 508 is supported by BBA Certification Certificate Number 94/3010.

Newton® 508 has many benefits and features:

  • Does not require extensive and damaging preparation to the wall surface
  • Speed of installation
  • Provides vapour control when used with humidity control systems and is capable of delivering an environment to all levels within a Grade 3 environment to BS 8102:2009
  • Resistant to rot, chemically aggressive groundwater, acids and alkalines, efflorescent salts and hydrocarbon contamination

Available in 2.4M x 20M (48M²) Rolls

Preparation

Newton® 508 can be installed over a wide range of substrates in varying situations - walls, ceilings, soffits, etc. However, before the system is installed, the area must be assessed to determine what preparation is required:

All timber and other organic material must be removed to prevent risk of fungal or bacterial growth behind the System, e.g. skirting boards, timber plates, old wallpaper etc. If evidence of rot exists, this must be dealt with by a specialist contractor prior to installation of the system (See our Woodworm & Dry Rot Control Products). If any mould, etc. exists, this should be cleaned off and the area sterilised with a Fungicidal Wash.

If the walls are uneven or areas have deteriorated, any large depressions should be levelled and made good to ensure a solid fixing

When fixing the system to flat soffits you must ensure that there is a fall to create proper drainage and prevent ponding. Any sagging of the membrane should not be great enough for ponding to take place

New concrete should be treated with Platinum Lime Inhibitor which prevents free lime from the curing concrete being drawn out by ingressing water.

Walls

Application on Walls:

Newton® 508 is fixed with the studs against the wall to create an air / depressurisation gap.

The membrane can be fixed either vertically or horizontally. When making this decision, you will need to take into account the size of the area to be lined, and the height of the walls relative to the width of the membrane. 

Horizontal fixing requires less cuts and jointing but the full roll is very heavy at first. Vertical fixing has much lighter strips to fix, but requires that each of these is taped back together again. You may find that vertical fixing is easier, but requires more Waterseal Tape for jointing.

The membrane is fixed to the wall with the Newton® MultiPlug. The MultiPlug has a soft rubber sealing washer fitted to the plug for sealing to the wall membrane.

Place the membrane in position as level as you can judge by eye. Using a 10mm drill bit, drill through the centre of a stud near the top and edge to a depth greater than the fixing.

The fixing is then hammered into the pre-drilled hole until the plug sits flush in the stud. The rubber washer re-seals the hole. Level the membrane using the spirit level or laser level if used, and fix another plug about 2 metres along at the top of the sheet. The membrane will now be hanging level to the wall.

If you are fixing horizontally, continue fixing every 2 metres until you have reached the end of the roll or you have covered all of the wall(s) to be treated. It is very important to regularly check the level. If the membrane is not level, you may well find that the membrane is kinked and looks unsightly, it will also dive down when fitted around corners.

If you are fixing vertically, hang each subsequent sheet by the two fixings as described above. The subsequent sheet should overlap by at least the width of the flange of the new sheet. You may find it easier to interlock the first stud of the new sheet to the last stud of the last sheet as this helps to keep the new sheet level.

The vertical joints have to be sealed with Waterseal Tape. It is easier to apply the tape to the inner surface of the flange of the next sheet. Clean the flange and the face of the last sheet with a clean rag.

When you have fixed the new sheet level with the correct overlap, pull off the backing paper from the tape and peel down whilst applying pressure to the flange.

Once all the backing paper has been removed, apply more pressure with the palm of your hand to further seal the whole of the joint. A Hot Air Gun should be used to help sealing, especially in cold or damp conditions.

Fixing Centres:

Once the wall membrane is hanging from the top fixings the rest of the fixing plugs need to be fixed.

The spacing of these fixings is dependant on the type of wall finish to be used:

  • Timber Battens - 600mm centres vertically and 400mm horizontally.

  • Barrel Vaults - Tighter centres 300mm around the vault and 600mm down the vault.

  • Fixed Metal Track (Gypliner) - 800mm centres vertically and 600mm horizontally.

  • Brick or Block Walls restrained to the retaining wall using ties should have the fixings at centres to provide the correct number of restraints at the correct centres.

  • Free standing timber and metal frames and free standing block walls do not require specific fixing centres. In these cases use sufficient fixings to ensure the membrane is neat and tidy and reasonably tight to the wall, especially around corners and reveals.

  • When fixing the system to vaulted soffits you must ensure that enough fixings are used to keep the wall membrane tight to the soffits with no sagging.

  • All fixings should be in line both horizontally and vertically.

Battens:

Battens should be pre-treated and of a minimum dimension of 25mm x 38mm although you may find that 25mm x 50mm offers better fixing at the edge of the plasterboard.

The battens can be fixed into the MultiPlug without piercing the membrane, by using 5mm (size 10) self-tapping screws. The plug will take 30mm of screw, so be sure to purchase the correct length for the thickness of batten.

Over-tightening of over length screws can loosen the plug. Be very careful not to puncture the wall membrane when drilling and fixing the battens. Battens should be fixed so that all plasterboard edges are supported. Use a Timber Treatment to protect cut battens.

Once the battens are fitted into position, plasterboard can be fixed to them using clout nails or preferably plasterboard screws. Care should be taken not to exceed the depth of the battens with the screws, and thereby puncture the membrane.

Alternative Fixings:

Other finishes may be employed depending on the requirements of the specifier.

Free Standing Frame:

This method should be employed if the wall is undulating, as with some stone structures or where space loss is a secondary consideration. The frame would be fixed to the soffit and the floor finish with the supplied ‘U’ channels.

With the increasing requirement of insulation to meet Part ‘L’ of building code, the use of these frames is becoming more popular, the thickness of insulation required is often in excess of the thickness of the frame, and so the use of these frames does not add extra depth to the wall build when using this method.

Because the frame is free standing and has no relationship with the wall membrane, very few fixings are required and so this wall finish above allows for the fastest and most efficient method of fixing Newton 508 to the wall.

Proprietary Fixing Systems:

Fixing systems such as Gypliner or Lafarge can be used with Newton® System 500. It is also possible to use metal profile systems when constructing new internal walls.

Internal Block Walls:

If preferred the system can provide a water and vapour proof barrier, and then be lined with a block or brick inner skin. Special ties are available that fit into the Newton® MultiPlug for lateral restraint of the internal wall. The ties and retaining clips can also be used for the fixing and holding in place the wall insulation.

Vaults

Installation to Vaults:

A ceiling which is to be covered, as in a vaulted cellar construction, should be fixed and lapped in such a way so that water does not pond behind the system.

The laps and joints should also be detailed correctly to allow correct drainage, and prevent water from sitting on joints. Newton Nuseal Plugs with a seal made from Waterseal Rope should be used for application to vaulted ceilings.

Where flat soffits are being considered it is imperative that they should have a fall in line with drainage requirements.

Again, sagging of the membrane should be avoided to prevent ponding.

Application:

Where Newton System 500 is to be installed in vaulted cellars our experience shows that the best method of application is as follows:

Measure the depth of the vault from front to back wall and allow for a down turn at each end of 200mm. Unroll the sheet and cut to size.

Estimate the approximate centre of the arched ceiling and mark it. Measure down the arch 1.2 meters from there and again mark it. Strike a horizontal line along the wall from back to front. This will give you a guide line for your sheet edge as you fix it along the length of the ceiling, thereby keeping your sheet sections symmetrical. You may wish to hammer in masonry nails to the guide line to give a physical edge to the guide line.

Offer up your first section of membrane to the ceiling allowing a lap to the back wall of 200mm. Using your guide line to keep the sheet square, drill and fix the sheet along the apex of the arch following the same line of studs.

The Nuseal Plug with Waterseal Rope should be used to seal the plugs.

NOTE: The Newton MultiPlug should not be used for this application as the rubber washer sold with the MultiPlug is not suitable.

The fixings should be fixed through the centre of the membrane studs at approximately 600mm centres.

It should be remembered that the plugs provide the fixing points for your battens; therefore they should be kept in line.

Your next section of membrane is again cut to size allowing a 200mm lap at each end. Before offering up the next sheet, a Waterseal Tape joint should be applied to the edges of the first sheet, either on the flanged edge or between the last two rows of studs on the none-flanged edge.

With the protective paper left on the tape you can now offer up the next sheet ensuring that you use the flanged edge to overlap onto the sealing tape.

Once you have the second sheet positioned correctly over the sealing tape, remove the protective paper working out from the middle and effect a seal.

You can now carry on fixing the sheet as previously described. This process is repeated until you have covered the arched walls to the springer and the vertical walls below the springer, maintaining a 200mm lap to the end walls.

Vaults - End Walls:

At the end walls of the vaulted construction an ‘end piece’ of flat membrane is fitted to the end wall of the vault. The 200mm lap from the soffit membrane is cut in fans to fit the curve and sit neatly against the wall, filling each cut with a small piece of Waterseal Rope or Waterseal Tape. Do not make the cuts all the way up to the ceiling and make as few cuts as possible.

Measuring the highest point of the arch, the ‘end piece’ membrane is cut to size and fixed to the end walls in front of the fanned ceiling membrane. The membrane is then trimmed to fit neatly into the curve of the ceiling.

The end wall membrane is then pulled back at the sides and around the arch to expose the studs on the reverse side.

Using Waterseal Rope, a joint is made by the same method at the stud / stud joint details, with the exception that around the arch the rope should follow the contour of the ceiling curve.

Door Reveals:

When you fit the Newton® Membrane to the end wall with the door opening, please bear in mind that you will have to fit a section of membrane around the door head and lapped down the sides by approximately 100mm.

You can then wrap the wall membrane around the sides, maintaining the correct drainage detail and forming an overlap.

This application detail will produce a small gap on the angle of the door opening.

This should be sealed using Newton® Overtape. Alternatively, Newton® 601 Slimline Membrane can be used a flat DPC in lieu of the studded membrane if space is limited.

Overhead Intrusions:

Where service pipes, electrical wiring or other intrusions occur overhead or around the arch, these should be re-sited to a vertical surface where they can be better sealed and re-situated on the dry side of the system.

Most services can be concealed between the battens. Services and protrusion should be collated where possible and passed through a pipe sealed with one of the Newton® pipe sleeve options.

Technical Data
Membrane Material HDPE
Membrane Thickness 0.8mm
Stud Depth 8.0mm
Density 500g/m²
Vicat Softening Temperature 126°C
Service Temperature -40°C to +80°C
Compressive Strength (EN 25619-2) 170 kpa
Thermal Conductivity (EN12667) 0.461 W/mK
Water Vapour Resistance - Sd Value (BS EN 1931) >604m
Water Vapour Resistance - μ Value >1208000μ
Water Vapour Diffusion Resistance >3020 MNs/g
Resistance to Fire (BS EN 13501-1) EuroClass
Chemical Resistance - Excellent (EN 14030) 100%
Oxidation Resistance - Excellent (EN ISO 13438) 100%
Radon Gas Resistance - Membrane* (K124/02/95) N/A
Radon Gas Resistance - Joints* (K124/02/95) N/A
Resistance to Liquid Hydrocarbons* (EN 16140:2011) N/A
Carbon Dioxide Permeability* N/A
Methane Permeability* N/A
Carbon Dioxide Transmission Rate (ISO 15105-1) N/A
Methane Transmission Rate (ISO 15105-1) N/A
The above data, even if carried out according to regulated tests are indicative and they may change when specific site conditions vary.¹After 14 days immersion in petrol and engine oil. *At the time of testing, the membrane was called Newton 508. Product name changed to 508R to reflect the gas and liquid hydrocarbon capabilities. The currently named Newton 508 has not been tested for resistance to gas or liquid hydrocarbons. **The test was carried out in accordance with Vinci In-House Test Procedure TP950/05/13569, issue 1, and Rilem Report 12, Performance Criteria for Concrete Duribility, E & FN Spon, London, UK, pp 226-230. All test certificates are available by request.
Data Sheets

Technical Data Sheet

Newton CDM Installation Manual

Declaration of Performance (DoP)

BBA Certificate

£170.00 ex. VAT | £204.00 inc. VAT