Wykamol CM3 Waterproof Membrane Kit

Wykamol CM3 Waterproof Membrane Kit

Wykamol Group | Basement Waterproof Membrane Kit

A high quality Waterproof Membrane Kit using Wykamol CM3 NON-MESH Membranesupplied with a roll Wykamol Corner Strip Tape, and the recommended number of Wykamol CM Brick Plugs for fixing.

Each kit size is also supplied with a high quality (W) 10mm x (L) 160mm SDS Drill Bit.

The Wykamol CM3 Waterproof Membrane Kit can be purchased in 20M² or 40M² sizes, use the drop-down box option below to choose your preferred kit size.

A full table of each Waterproof Membrane Kit Contents is shown below in the 'Description' Tab.

  Wykamol CM3 Membrane is supported by BBA Certification Certificate Number 18/5595.


Wykamol CM3 Waterproof Membrane Kit

Wykamol CM3 Waterproof Membrane is a High Quality, 3mm Studded, NON-MESHED, HDPE Membrane suitable for use on Walls, Floors, Vaults and Tunnels, above and below ground level.

Wykamol CM3 Waterproof Membrane can be used for both Damp Proofing (Above Ground Level) and for 'Type C' Structural Waterproofing (Below Ground Level; i.e. Basements).

Wykamol CM3 Waterproof Membrane can be used as an alternative to meshed membranes where a meshed surface is not required, typically where the wall finish to the membrane is timber battens, a dry-lining frame or block wall.

Wykamol CM3 Waterproof Membrane is guaranteed against deterioration for 30 years and has a life expectancy of at least 50 years.

Kit Contents:

CM3 Waterproof Membrane Kit
Kit Size Membrane Roll Size No. of Fixings No. of Sealing Tape No. of SDS Drill Bits
20M² Kit (W) 2.0M x (L) 10M 50 x Wykamol CM Brick Plugs 1 x Roll of Wykamol Corner Strip Tape
(W) 150mm x (L) 12.5M
1 x SDS Bit
(W) 10mm x (L) 160mm
40M² Kit (W) 2.0M x (L) 20M 100 Wykamol CM Brick Plugs 1 x Roll of Wykamol Corner Strip Tape
(W) 150mm x (L) 25M
2 x SDS Bits
(W) 10mm x (L) 160mm

Product Uses:

For use as a 'Type C' Waterproofing Membrane:

As a Waterproof Membrane, Wykamol CM3 Membrane is suitable for the 'Type C' Waterproofing of earth retained walls, floors, vaults and tunnels below ground level (i.e basements).

Wykamol CM3 Membrane is guaranteed against deterioration for 30 years and has a life expectancy of at least 50 years, delivering a Grade 3 environment to BS8102:2009 and NHBC Chapter 5.4.

For use as a Damp Proofing Membrane:

As a Damp Proof Membrane, Wykamol CM3 Membrane can be used above ground level, as an alternative to meshed membranes where a meshed surface is NOT required, typically where the wall finish to the damp proof membrane is timber battens, a dry-lining frame or block wall.

Wykamol CM3 Membrane is guaranteed against deterioration for 30 years and has a life expectancy of at least 50 years.

  Read our Guide on 'How To Identify & Treat Rising Dampness On Walls' and 'How To Install a Damp Proof Membrane'.

Benefits & Features:

  • BBA Approved

  • Suitable for use in Above Ground (Damp Proofing) and Below Ground (Basement Waterproofing) applications.

  • Does not require extensive and damaging preparation to the wall surface.

  • Only 3mm in thickness and so is ideal for when space is tight, such as with stairs or low headroom.

  • Speed of installation.

  • Provides vapour control and, when used with humidity control systems, is capable of delivering an environment to all levels within a Grade 3 environment to BS 8102:2009 and NHBC Chapter 5.4.

  • Creates a dry, habitable living space in areas previously suffering from damp / wet conditions.

  • Waterproof, Salt Inhibiting, Root and Contaminate resistant.

Technical Data:

Membrane Material HDPE
Membrane Thickness 0.6mm
Stud Depth 3.0mm
Density 500g/m²
Softening Temperature 126°C
Service Temperature -50°C to +80°C
Tensile Strength MD (BS 12311-2) 418 N
Tensile Strength CD (BS 12311-2) 488 N
Water Vapour Resistance >3020 MNs/g
Resistance to Static Loading (BS 12730) >20 Kg
Resistance to Fire (BS EN 13501-1) Class F
Life Expectancy Lifetime of Structure


For Waterproofing

When Using As A 'Type C' Basement Waterproof Membrane


When used in new construction, the concrete slab must be laid in accordance with BS 8204-1:2003+A1:2009 to achieve a flat surface not deviating more than 5mm from the underside of a 3000mm straight edge.

Unsound plaster, render or screed should be removed and surfaces made level, with floors to the above tolerances. This can be achieved using Universal Mortar, or a 3:1 sand:cement mix incorporating Renderproof Waterproofing Additive.

Leave all new works to dry thoroughly before any membranes are fixed.

In case of walls suffering from mould or masonry fungi, prior to fixing the membrane, remove surface contamination by brushing, then apply a Masonry Biocide in line with the relevant Technical Data Sheet

If Dry Rot (Serpula Lacrymans) is present in the walls, this will require detailed assessment before proceeding. 

Above ground level it is recommended, that where possible, all sources of moisture are alleviated at the source using a DPC such as Ultracure, before applying Wykamol CM3 Membrane. This reduces potential damage to masonry and timber etc.

Application on Walls:

Wykamol CM3 should be installed by those with experience of structural waterproofing.

It is recommended that Wykamol CM3 and its ancillary products be installed by contractors trained for the correct use and specification of the product.

Wykamol CM3 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 Wykamol Corner Strip Tape for jointing.

The membrane is fixed to the wall with the Wykamol CM Brick Plugs. These plugs have 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.

Wykamol CM3 does not have a flange, so a butted joint is used.

Starting at one side of the room, unroll the membrane with the studs down. The next membrane width is rolled out so that edges of the two rolls meet at a ‘butt joint’. Clean both edges.

Wykamol Corner Strip Tape (150mm wide) is then applied above the butted joint to join the two widths of membrane. This process is repeated until all areas are covered.

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 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 CM Brick Plugs without piercing the membrane, by using 5mm (size 10) self-tapping screws. CM Brick Plugs 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 503 to the wall.

Proprietary Fixing Systems:

Fixing systems such as Gypliner or Lafarge can be used. 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 CM Brick Plugs 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.

Application on Floors:

Drainage Requirements:

When used in a full or part earth-retaining situation, the membrane system must be drained.

To comply with BS 8102:2009, you must assume that the structure will be subjected to water ingress at some time.

A Flooring Membrane can also be installed over the floor in above ground situations to provide isolation from damp floors either as the primary DPM or above green concrete to accelerate the contract program.

The concrete will continue to cure below the dry membrane surface allowing for floor finishes to be laid above the membrane much quicker than normal.

Methods of Drainage For Floor Membranes:

The drainage must effectively remove all water from below the membrane and take the water to a point of discharge such as a sump chamber or a form of safe natural drainage. Standing water can block the membrane with silt or limescale so it is important for water to flow uninterrupted to the drainage point.

Wykamol Waterguard Drainage Channel:

Wykamol Waterguard Channel is placed at the wall / floor junction and collects water from behind the wall membrane and receives water at the wall / floor junction. Wykamol Waterguard Channel is a designed method of removing water as it can interface with sump chambers, gullies, waste pipes etc. It can also be maintainable by inserting Wykamol Flexi Jetting Eyes into the system.


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.

Wykamol CM3 does not have a flange, so a butted joint is used.

Starting at one side of the room, unroll the membrane with the studs down. The next membrane width is rolled out so that edges of the two rolls meet at a ‘butt joint’. Clean both edges.

Wykamol Corner Strip Tape (150mm wide) is then applied above the butted joint to join the two widths of membrane. This process is repeated until all areas are covered.

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.

Seal the Wykamol CM3 Membrane to the up-stand of the Wykamol Waterguard perimeter drainage channel with Wykamol Corner Strip Tape. Use a heat-gun to dry the membrane surface and to assist with the bonding of the tapes.

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

If there are any services 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 Damp Proof Course (DPC) is laid over and sealed to the service with Wykamol Rope, and around its perimeter with Wykamol Membrane 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.

Fast Track Application of Floor Finishes:

Following the installation of new concrete slabs and screeds, it is normal to expect lengthy drying periods before floor finishes can be applied.

The membranes can be laid onto green concrete as soon as it is ‘walkable’, allowing instant application of floor coverings without reference to RH levels.

The construction moisture is controlled in the air gap.

Application 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. Use CM Brick Plugs (Without the Rubber Sealing Washers) but instead with a seal made from Wykamol Rope for application to vaulted ceilings.

NOTE: The Rubber Sealing Washers should not be used with the CM Brick Plugs for this application as the washers are not suitable for this purpose.

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.


Where these membranes are 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.

Again, the CM Brick Plugs (Excluding the Rubber Seals) with Wykamol Rope should be used to seal the plugs.

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 Wykamol Membrane 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 membrane tape.

Once you have the second sheet positioned correctly over the membrane 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 Wykamol Rope or Wykamol Membrane 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 Wykamol 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 Wykamol CM3 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 Wykamol Corner Strip Tape. Alternatively, a slim Flooring Membrane such as Newton 601 Slimline Membrane or Platon Stop 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.

For Damp Proofing

When Using As A Damp Proof Membrane


Clean the substrate to remove all loose debris and organic matter. Plaster should be removed as it can soften over time, which will weaken the fix of the membrane to the wall. If the wall render is in good condition, it does not have to be removed and Wykamol CM3 Membrane can be fitted directly over. Loose or crumbling render should be removed.

If evidence of bacterial growth can be seen, use a fungicidal product prior to the fitting of the membrane.

If any evidence of wet rot or dry rot is seen, have it dealt with by a qualified remedial specialist.

If a new slab is to be laid as part of the works, it is preferable to fit Wykamol CM3 Membrane prior to the laying of the floor slab with the floor DPM extending upwards in front of the Wykamol CM3 Membrane ready for the concrete placement.

Cutting to Size:

Wykamol CM3 Membrane can be cut with a sharp utility knife, scissors or shears

Decide whether the membrane is to be fitted horizontally or vertically

Membrane Jointing:

Joints may be made horizontally or vertically.

Fit the edge of the next length of membrane adjacent to the previous sheet with a butt-joint. Overtape the butt-joint with Wykamol Corner Strip Tape.

Wykamol CM3 Membrane can be taken round corners. Try to fit the membrane square with neat creases to the internal and external corners. Where the membrane starts to be misshapen due to the contours of the wall, cut the membrane and start again with a new butt-joint secured with Wykamol Corner Strip Tape.

In cold and damp conditions a heat gun should be used to gently evaporate surface moisture prior to the application of the Wykamol Corner Strip Tape.

Fixing to the Wall:

Cut the membrane to size. Ideally, Wykamol CM3 Membrane should be continued up into ceiling voids and down past the slab to the oversite. If this is not possible, cut the membrane so that it finishes tightly to the soffit and floor finish. A gap is not required at the soffit or floor, indeed the system works more efficiently when the system is not ventilated as this impedes the natural vapour drive from inside the property to the outside that still continues through the membrane.

Wykamol CM3 Membrane is fitted to the wall with the studs facing the wall and the flat surface facing inwards towards the applicator. Fix the membrane to the wall with the CM Brick Plugs to all substrates except to slightly friable mortar substrate, when the Cob Plug should be used.

Wykamol CM3 Membrane can be fitted horizontally or vertically. Fit the membrane as level as possible - best results are achieved when a long builders level or a rotating laser level is used.

Using a 10mm SDS Drill Bit, drill through the membrane into the wall to a depth of at least 60mm.

Fix only as many plugs as are required to fix the membrane neatly to the wall

If fixings are required for fixing of timber battens, brackets for Gypliner type dry-lining frame or wall ties, add further plugs to the correct centres required for the wall lining.

Hammer the plugs home using a wide headed hammer such as a lump hammer or mallet.

Fit Wykamol CM3 Membrane to return walls to isolate wall finishes from dampness transmitting from the main wall being treated.

Wykamol CM3 Membrane can be taken into reveals.

Using CM Brick Plugs for Fixing:

CM Brick Plugs have a hollow core that is designed to receive 5mm self-tapping screws. Use either plug to secure timber battens or locating brackets from wall lining systems. Heavier items can be supported by screwing a piece of chipboard to the plugs at fairly close centres and then fixing the heavier item to the chipboard in a conventional way

Fixing Heavier Objects to the Wall:

Heavier objects should be attached to the wall using resin anchors. Seal around the resin anchor with Newton 801-M Mastic Sealant.

Data Sheets

Technical Data Sheet:

Declaration of Performance (DoP):

BBA Certificate:

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