Newton CDM 508 Membrane - 8mm Studded Waterproof Membrane

Health & Safety And Installer Competency

Newton CDM 508 should be installed only by competent installers with suitable experience in structural waterproofing, basement waterproofing and Type C cavity drain membrane systems. The Newton CDM 508 Technical Data Sheet states that CDM 508 is a constituent part of the Newton CDM System, which is a Type C internal waterproofing system, and that it should be installed by those with experience of structural waterproofing. Newton also recommends installation by Newton Specialist Contractors trained in the correct design and installation of the system, which is stated as a requirement of the BBA Certificate.

Before work begins, the installer should read the Newton CDM Installation Manual and the Newton CDM 508 Technical Data Sheet, assess the site conditions and confirm that the chosen specification is suitable for the structure. Newton CDM 508 should be used only as stated within the application guidance, and normal site health and safety requirements should be followed. Suitable PPE should be worn, including gloves and safety glasses, particularly when drilling, cutting membrane, handling tapes, working overhead or using a heat gun. Where work is carried out at height, such as on vaulted soffits or high walls, suitable staging or scaffold should be used rather than unsafe steps or improvised platforms.

Care must be taken when using SDS drills, cutting tools and hot air guns. Drilling should be controlled to avoid damaging the membrane, the substrate or hidden services. Cutting should be carried out with a sharp knife and spare blades so the membrane can be trimmed cleanly without tearing. Heat guns are commonly used to dry membrane surfaces and assist adhesion of tapes in cold or damp conditions, but they should be used carefully to avoid overheating the membrane, damaging adjacent materials or creating a fire risk. The working area should be kept clean, well lit and organised so membrane rolls, tools and tapes can be handled safely.

System Design Principles

Newton CDM 508 is not a standalone waterproofing product and must not be treated as a barrier that holds back water pressure on its own. It forms part of the Newton CDM System, a Type C cavity drain waterproofing system that works by creating depressurisation spaces behind the studded membrane and within drainage channels. These spaces allow water ingress to be controlled and directed safely to drainage, a sump chamber or another suitable discharge route. The Newton CDM System does not seek to hold back hydrostatic water pressure; it manages water by collecting and removing it.

The design must comply with BS 8102:2022 for the protection of below-ground structures against water ingress. The manual states that, unless extensive groundwater analysis has been undertaken, the design should assume water pressure to the full depth of the basement, and must also consider changing groundwater levels, burst water mains, surface flooding and similar risks. Adequate drainage and water removal must be included within the design because the Newton CDM System will not hold back water pressure.

The external elements of the structure should control the rate of water ingress so that it does not exceed the capacity of the cavity drain system. For existing structures, the level of water resistance, the presence or absence of external drainage, ground conditions and construction type should be assessed before installation. In some cases, the structure may need upgrading before Newton CDM 508 is installed, using measures such as a new structural slab, a Type A slurry tanking membrane or resin injection to reduce water flow. For new-build structures, the structure should be designed to be as watertight as required for its intended use, with suitable crack control, robust joint detailing, dense concrete and protection against contaminants where needed.

Newton CDM 508 is available in 500g/m² and 700g/m² variants. Both variants are suitable for wall applications, but only the 700g/m² variant should be used for floors. The 500g/m² versions must not be used for floor applications because they do not have the required compressive strength for that use. CDM 508 is also not suitable for gas protection systems, so where radon, methane or hydrocarbon gas protection is required, the specification should be changed to an appropriate Newton gas-rated system rather than relying on standard CDM 508.

Suitable Substrates

Newton CDM 508 is suitable for installation to walls constructed from concrete, brick and concrete block. It can also be fixed to ICF construction where special longer fixing plugs are used. The substrate must be capable of receiving the chosen Newton CDM fixing plug securely, and any weak, friable, excessively uneven or deteriorated areas should be addressed before installation begins.

For floors, Newton CDM 508 should be installed only where the correct density variant is selected. The 700g/m² CDM 508 variant may be used over a concrete raft or slab, and the Technical Data Sheet also lists Newton Fibran XPS 500-C closed cell extruded polystyrene insulation as a suitable floor substrate within the relevant Newton system build-up. Where CDM 508 is used above a 50mm insulation spacer, Newton Fibran XPS 500-C is the tested product for use as the BaseDrain spacer below the floor membrane, and design loadings should be checked where high loads are expected.

For soffits, Newton CDM 508 may be used on concrete soffits where the soffit is to a fall, and on brick arched or vaulted soffits. Flat soffits are heavily restricted and should not be treated as routine applications. They must be considered carefully because water must be able to drain away without ponding behind the membrane.

Preparation Of Walls, Floors And Soffits

Before installing Newton CDM 508, the area must be assessed to determine what preparation is required. All timber and organic material must be removed from behind the system to prevent fungal or bacterial growth. This includes items such as skirting boards, timber plates, old wallpaper and similar organic materials. If rot is present, it should be dealt with by a specialist before the membrane is installed. If mould is present, the area should be cleaned and sterilised with a fungicidal wash.

Walls must be suitable for fixing. Where walls are uneven or have deteriorated, large depressions should be levelled and made good so the fixings can hold properly and the membrane can sit in a controlled manner. The aim is not to create a perfectly smooth decorative surface, but the wall must be capable of receiving the fixings and allowing the membrane to be installed neatly without excessive sagging, distortion or unsupported areas.

For floor applications, the floor must be cleared of oil, loose material and sharp protrusions. Holes or severe depressions should be filled, and the slab or raft must be made suitable for drainage. The manual makes clear that the performance of the drainage system depends on the gradient and regularity of the slab or raft, and that both the design of a new slab and the preparation of an existing slab are fundamental to the success of Type C waterproofing. The surface regularity recommended for the Newton CDM System is SR1 or better, which is 3mm on a slip gauge. Surface regularity and departure from datum should be tested using water in a flood test or by laser levels. Any irregularities should be made good by planing, grinding or using a suitable levelling compound such as Ardex Arditex NA.

For floors, the datum point is the slab height where the drainage channel is adjacent to the sump chamber. Deviation from this datum must not be more than -5mm at any point between the datum and the furthest point of the waterproofing system. A deviation of up to +15mm may be acceptable only where it occurs at the furthest point from the datum and does not occur at a mid-point that could strand water. This is important because trapped standing water can block the cavity or drainage system with silt or lime scale, and the Newton CDM System relies on free water movement to the drainage point.

Where flat soffits are being considered, the soffit must have a fall to promote drainage and prevent ponding. Any sagging of the membrane must be avoided because it can create pockets where water may sit behind the membrane. The manual refers flat soffit installations to the BS 8102:2022 guidance for inverted cavity drain systems, and the Newton CDM 508 Technical Data Sheet applies further restrictions to this type of work.

New concrete should be treated with Newton 106 Lime Inhibitor or Wykamol Anti Lime Sealer to prevent free lime from curing concrete being drawn out by ingressing water. This is particularly important because lime scale and silt can affect drainage performance within cavity drain systems. The substrate, membrane surfaces and all sealing areas should be clean, dry and dust free before any tapes, ropes or sealing products are applied.

Anti-lime sealer being applied to prepared concrete before installation of Newton 508 Waterproof Membrane.

Tools And Ancillary Products Required

The minimum tools required for Newton CDM 508 installation include a good quality 110V SDS hammer drill, suitable 10mm or 11mm SDS drill bits depending on the plugs being used, a mallet or club hammer, a sharp Stanley knife with spare blades, a tape measure, a long spirit level, clean rags, suitable staging or scaffold for work at height, gloves and safety glasses. Recommended additional equipment includes extra lighting, a 110V hot air gun and a rotating laser level. The Newton CDM 508 Technical Data Sheet also identifies high quality SDS drill and drill bits, a heat gun and a rotating laser level as specialist tools, with the laser level recommended rather than mandatory.

The key ancillary products for Newton CDM 508 include Newton CDM MultiPlugs, Newton CDM NuSeal Plugs, Newton CDM Rope, Newton CDM Joint Tape, Newton CDM OverTape, Newton CDM BaseDrain, Newton CDM FloorDrain where required, Newton CDM Condensation Strip, Newton DampSafe 809-HP DPC where continuity is needed through internal walls, Newton Pipe Collar or Newton Pipe Sleeve for service penetrations, and suitable Newton drainage and pumping systems. CDM Joint Tape is used for jointing membranes along the flange. CDM Rope is used where a flange seal is not possible and for sealing plugs in vaulted or overhead work. CDM OverTape is used for connecting floor membranes to BaseDrain upstands, connecting floor membranes to wall membranes, sealing abutting joints of CDM 508, and for repairs and reveal details.

Drainage Requirements

Drainage is central to the correct use of Newton CDM 508. The system must remove water from behind and beneath the membrane and take it to a safe point of discharge, such as a sump chamber or a suitable natural drainage outlet. Standing water must not be allowed to remain below the membrane because it can block the system with silt or lime scale. The design must allow water to flow uninterrupted to the drainage point.

Newton CDM BaseDrain is placed at the wall/floor junction to collect water from behind the wall membrane and receive water at the wall/floor junction. It is a maintainable drainage method because Newton Inspection Ports can be inserted into the system. CDM BaseDrain can interface with sump chambers, gullies, waste pipes and associated drainage arrangements. Where existing floors provide insufficient headroom to use CDM BaseDrain within a spacer of Newton CDM Fibran XPS 500-C insulation, CDM BaseBoard can be used as an alternative drainage system.

For larger waterproofing designs, the pumping system must be sized and located correctly. The manual states that the general rule of thumb is one sump for every 50m of CDM BaseDrain, although this depends on the watertightness of the structure, the likely water ingress, ground conditions, slab levels and overall drainage design. In larger properties, strategically placed sumps, cross drainage channels of CDM FloorDrain or Titan collection sumps connected to larger Trojan-Pro pumping systems may be used. Pump size depends on expected flow, pumping head and chamber size, with discharge pipes generally sized to suit the pump output.

The drainage system should discharge appropriately, ideally to a suitable drainage or attenuation system that can receive the designed water volume and is not susceptible to flooding, freezing or surcharge back into the building. Pump discharge directly into a combined sewer should not occur without appropriate consents and suitable non-return valves. Where contaminated water is expected, discharge consents should be sought. Battery back-up should be considered, and Newton Victron Battery Back-up systems are available so pumping can continue during power failure, subject to the battery capacity being correctly assessed for the volume of water expected during the outage.

Newton CDM Basedrain positioned at the wall-to-floor junction to collect water from behind the Newton CDM 508R Waterproof Membrane, with Newton CDM Overtape securing the channel to the Newton Condensation Strip and Newton CDM Fibran XPS 500-C Insulation beneath (via Newton CDM 508R Waterproof Membrane as a floor membrane). 

Wall Installation

Newton CDM 508 can be fixed either vertically or horizontally to walls. The choice depends on the size of the area, the wall height and the width of the membrane. Horizontal fixing generally requires fewer cuts and less jointing, but the full roll is heavy at the start. Vertical fixing involves lighter strips, but each sheet must be jointed back together with CDM Joint Tape, so it normally uses more tape.

The membrane is fixed to the wall using the appropriate Newton CDM fixing plug for the application. CDM MultiPlugs and CDM Plugs include a soft rubber sealing washer to seal the plug to the wall membrane. CDM NuSeal Plugs require a bead of CDM Rope to create the seal before installation. For standard wall work with Newton CDM 508, the CDM MultiPlug is commonly used, but the selected plug must suit the substrate and the required fixing detail.

Position the Newton CDM 508 against the wall as level as possible. Using a 10mm drill bit, drill through the centre of a stud near the top edge of the membrane to a depth greater than the fixing. The fixing is then hammered into the pre-drilled hole until the plug sits flush within the stud. Where a rubber washer is used, the washer re-seals the hole. The membrane should then be levelled with a long spirit level or rotating laser level, and a second plug fixed approximately 2m along the top of the sheet. At this stage, the membrane is hanging level from the wall.

For horizontal installation, continue fixing along the top edge at approximately 2m intervals until the wall is covered or the roll ends. The level should be checked regularly. If the membrane is not installed level, it may kink, appear unsightly and move out of alignment when taken around corners. For vertical installation, hang each subsequent sheet using the same initial top-fixing method, overlapping by at least the width of the flange of the new sheet. Interlocking the first stud of the new sheet with the last stud of the previous sheet can help keep the new sheet level.

Vertical joints should be sealed with CDM Joint Tape. It is generally easier to apply the tape to the inner surface of the flange of the next sheet. The flange and the face of the previous sheet should be cleaned with a clean rag before sealing. Once the new sheet is fixed level with the correct overlap, remove the backing paper from the tape while applying pressure to the flange. After the backing paper has been removed, apply further pressure with the palm of the hand along the whole joint. A hot air gun should be used to help sealing, especially in cold or damp conditions.

Typical wall and floor junction detail showing Newton 508 Waterproof Membrane installed as part of a cavity drain waterproofing system, with associated drainage, fixing, insulation and screed components.

Wall Fixing Centres And Internal Finishes

Once the wall membrane is hanging from the initial top fixings, the remaining fixing plugs can be installed. Fixing centres depend on the type of wall finish. Where timber battens are used, fixings should be at 600mm centres vertically and 400mm centres horizontally. For barrel vaults, tighter centres are required, with 300mm around the vault and 600mm down the vault. For fixed metal track systems such as Gypliner, fixings should be at 800mm centres vertically and 600mm centres horizontally. Where brick or block walls are restrained back to the retaining wall using ties, fixings should be set out to provide the correct number of restraints at the required centres.

Free-standing timber frames, free-standing metal frames and free-standing block walls do not require the same specific fixing centres because the finish is not directly supported from the retaining wall membrane. In these cases, enough fixings should be used to keep Newton CDM 508 neat, tidy and reasonably tight to the wall, especially around corners and reveals. All fixings should be aligned both horizontally and vertically, particularly where they will later receive battens, rails, ties or other internal lining components.

If timber battens are used, they should be pre-treated and at least 25mm x 38mm, although 25mm x 50mm may provide better edge fixing for plasterboard. Battens can be fixed into the CDM fixing plug without piercing the membrane by using 5mm size 10 self-tapping screws. The plug will accept 30mm of screw, so screw length must be selected according to the batten thickness. Over-tightening or using screws that are too long can loosen the plug, and care must be taken not to puncture the membrane when drilling or fixing. Plasterboard can then be fixed to the battens with clout nails or, preferably, plasterboard screws, ensuring the screws do not exceed the batten depth and puncture the membrane.

Other internal finishes can be used depending on the specification. Free-standing frames are suitable where walls are undulating, such as in some stone structures, or where space loss is less critical. Proprietary systems such as Gypliner or Lafarge systems can be used with the Newton CDM System. Internal block or brick walls can also be built in front of the membrane, with special ties available to fit into the CDM fixing plug for lateral restraint. These ties and retaining clips can also help hold wall insulation in place. Newton CDM 508 itself is not a meshed membrane and does not provide a direct plaster or render key, so direct plastering or rendering applies to Newton 508 Mesh rather than standard Newton CDM 508.

Newton MultiPlugs fixing Newton 508 to the wall, with fixing centres set to suit the internal finish, typically 600mm vertically and 400mm horizontally for timber battens.

Floor Installation

Newton CDM 508 may be used on floors only in the 700g/m² variant. The 500g/m² version should not be used for floor applications because it does not have the required compressive strength. Before installation, the floor must be prepared, levelled, cleaned and checked as described above, and the drainage system must be confirmed. Both edges of the membrane should always be cleaned before making any joint.

Starting at one side of the room, unroll the membrane with the studs facing down and cut it to fit the room in a similar manner to laying a carpet. The next width of membrane is rolled out so that the flanged edge overlaps onto the edge of the previous roll. Both edges must be cleaned before sealing. CDM Joint Tape is then applied to the high flat area between the first two studs at the edge of the previous roll, with the backing paper still intact. The two widths should be checked for alignment, with the flange covering the backing paper. Starting from the end of the joint, remove the backing paper and press down along the joint to seal the two sections together. This process is repeated until all required floor areas are covered.

The Newton floor membrane must be sealed to the upstand of the CDM BaseDrain channel, or to the CDM Condensation Strip where fitted, using CDM OverTape. A heat gun should be used to dry the membrane surface and assist the bond of the tapes, particularly where conditions are cold or damp. Where the floor membrane must be jointed to horizontal DPCs, such as Newton DampSafe 809-HP DPC through internal or external walls, these joints should be sealed with CDM Joint Tape, and both surfaces must be clean and dry before the joint is made.

Services through the floor should be avoided wherever possible because they create weaknesses and allow unnecessary water ingress. Where a service penetration is unavoidable, the membrane can be cut and trimmed around the service, and the gap filled and sealed using the appropriate Newton adhesives or sealing products. If required, a patch of membrane or Newton DampSafe 809-HP DPC can be laid over the area and sealed to the service with CDM Rope, with the patch perimeter sealed using CDM Joint Tape. Newton Pipe Collar or Newton Pipe Sleeve can also be used.

The specified floor finish can be laid directly over the floor membrane, but the membrane must not be punctured by fixings through the floor. Where a timber floor finish is used, an expansion gap must be allowed around the wall edge, and the floor finish supplier should be consulted to confirm the correct expansion gap size. The manual also states that Newton membranes can be laid onto green concrete as soon as it is walkable, allowing floor coverings to be installed without reference to relative humidity levels because the construction moisture is controlled within the air gap.

Vaulted Soffit Installation

Newton CDM 508 can be used for vaults and vaulted soffits. The membrane must be fixed and lapped in a way that prevents water ponding behind the system. Laps and joints must be detailed so that water drains correctly and does not sit on the joints. The rubber sealing washer supplied with CDM MultiPlugs or CDM Plugs should not be used for fixing the membrane to vaulted ceilings or soffits. Instead, a seal made from a ring of CDM Rope should be used with the chosen Newton CDM fixing plug.

For vaulted cellar applications, measure the depth of the vault from the front wall to the back wall and allow for a 200mm downturn at each end. Unroll the membrane and cut it to size. Estimate the approximate centre of the arched ceiling and mark it, then measure down the arch by 1.2m and mark again. Strike a horizontal line along the wall from back to front. This line acts as a guide for the sheet edge and helps keep the sheet sections symmetrical. Masonry nails can be used along the guide line to create a physical edge where useful.

Offer the first membrane section up to the ceiling, allowing a 200mm lap to the back wall. Using the guide line to keep the sheet square, drill and fix the sheet along the apex of the arch, following the same line of studs. Use either CDM MultiPlugs or CDM NuSeal Plugs, with CDM Rope used to seal the plugs. The manual specifically notes that the rubber washer supplied with the CDM MultiPlug is not suitable for this application, and that plugs should be ordered without washers where CDM Rope is being used to form the seal. Fixings should be installed through the centre of the membrane studs at approximately 600mm centres, and should be kept in line because they provide fixing points for the battens.

The next section of membrane should also be cut to size with a 200mm lap at each end. Before offering up the next sheet, apply CDM Joint Tape to the edges of the first sheet, either on the flanged edge or between the last two rows of studs on the non-flanged edge. Leave the protective paper in place while positioning the next sheet, ensuring the flanged edge overlaps onto the sealing tape. Once the second sheet is positioned correctly, remove the protective paper working out from the middle and form the seal. Continue fixing in this way until the arched walls are covered down to the springer and the vertical walls below the springer, maintaining the 200mm lap to the end walls.

At the end walls of a vaulted construction, an end piece of flat membrane is fitted to the end wall of the vault. The 200mm lap from the soffit membrane should be cut in fans so it fits the curve and sits neatly against the wall. Each cut should be filled with a small piece of CDM Rope or CDM Joint Tape. Cuts should not be made all the way up to the ceiling, and as few cuts as possible should be made. The end wall membrane is then cut to size, fixed in front of the fanned ceiling membrane and trimmed neatly into the curve of the ceiling. The membrane is then pulled back at the sides and around the arch to expose the studs on the reverse side, and CDM Rope is used to form the joint, following the contour of the ceiling curve around the arch.

Flat Soffit Restrictions

Flat soffits are restricted and should not be treated as a standard Newton CDM 508 application. The Newton CDM 508 Technical Data Sheet states that CDM 508 should not be applied to flat soffits unless the soffit is at least 400mm narrower than the membrane being used, and only by very experienced contractors.

Where flat soffits are considered, they must have a fall in line with drainage requirements. Sagging of the membrane must be avoided because sagging may cause ponding behind the system. The manual states that installation to flat soffits should follow BS 8102:2022 guidance for inverted cavity drain systems, and that if there is any doubt, Newton’s technical advice should be sought.

Door Reveals, Corners And Junction Details

Door reveals require careful detailing so that the Newton CDM 508 system remains continuous around the opening. When fitting membrane to an end wall with a door opening, allow for a section of membrane around the door head, lapped down the sides by approximately 100mm. The wall membrane can then be wrapped around the sides while maintaining the correct drainage detail and forming an overlap. This method may leave a small gap on the angle of the door opening, which should be sealed with CDM OverTape. As an alternative, Newton DampSafe 601 Slimline or Newton DampSafe 802-DPM can be used through the reveal, taped to the wall membrane with CDM Joint Tape and CDM OverTape.

Corners and junctions should be planned so membrane overlaps support continuous drainage behind the system. Overlaps must not be formed in a way that allows water to drain onto a joint or become trapped by a joint. On walls, the membrane may be installed vertically or horizontally, and overlaps can be made using the flanged edge or by overlapping a minimum of three rows of studs where appropriate.

For 8mm cavity drain membranes such as Newton CDM 508, the preferred sealed joint is the flanged joint where the flat flanged edge is available. Consecutive membrane widths are fixed to walls or laid to floors so that the flange lies over the studded edge of the previous sheet, covering a minimum of two rows of studs. CDM Joint Tape is placed beneath the flange on the studded edge sheet, positioned between the last two rows of studs on the flat section, and pressed firmly into place with the backing paper left on until the upper flange is correctly positioned. The backing paper is then removed and the two membrane layers are pressed firmly together.

A locked flanged joint may be used where the first line of studs of the next sheet is interlocked with the last line of studs of the previous sheet. This helps guarantee that the next sheet is fitted square to the previous one and is useful on large floors or where horizontal wall membrane joints need to remain straight. Where a flanged joint is not possible but the studs line up correctly, a stud-into-stud joint can be made with a minimum three-stud overlap using CDM Joint Tape. Where the studs do not interlock, a stud-over-stud joint is made with a minimum three-row overlap and CDM Rope positioned between the last two rows of studs on the reverse side of the upper membrane.

Protrusions Through Newton 508

Service pipes, cables, conduits and other intrusions should be avoided where possible because they interrupt the continuous waterproof layer. Where services through floors or walls cannot be avoided, Newton CDM 508 should be trimmed neatly around the service and sealed with CDM Rope, CDM OverTape or a combination of both. If necessary, a patch of Newton DampSafe 809-HP DPC can be placed over the detail and sealed to the service and around its perimeter using Newton sealing products. Newton Pipe Collar or Newton Pipe Seal preformed collars can also be used to seal around protrusions.

For floor penetrations, the manual specifically notes that protrusions through the floor slab or raft should be avoided wherever possible because they create weaknesses that allow unnecessary water ingress. Where a penetration is unavoidable, trim the membrane carefully, seal the gap properly and, where necessary, use a patch detail sealed with CDM Rope and CDM Joint Tape or use a Newton pipe sealing accessory.

For overhead intrusions within vaulted soffits or arches, service pipes, electrical wiring and other services should ideally be re-sited to a vertical surface where they can be better sealed and positioned on the dry side of the system. Many services can be concealed between battens. Where services must pass through the membrane, they should be grouped where possible and passed through a pipe sealed with one of the Newton pipe sleeve options.

Protection Of Newton 508 After Installation

Newton CDM 508 must always be protected by suitable surface finishes. On walls and vaulted soffits, the suitable protection methods listed for standard Newton CDM 508 are a floor-supported dry-lining frame with plasterboard, or timber battens fixed into Newton CDM MultiPlugs as a support for plasterboard or wooden sheeting. Suitable plasters and renders apply to Newton 508 Mesh only, not standard Newton CDM 508.

For floors, the membrane may be protected by screed, tongue-and-groove chipboard, a timber floor supported by a fixed lattice of timber supports, insulation with screed or tongue-and-groove chipboard above, or an underfloor heating tray with screed above. Any finish must be installed without puncturing the membrane, and future fixings through the floor build-up must be considered carefully.

The stated service life of Newton CDM 508 depends on it being specified, installed and protected in accordance with the Data Sheet and Installation Manual, and being fully and permanently isolated from UV light, physical damage and wearing. This means the membrane should not be left exposed to long-term sunlight, impact, abrasion or trafficking without protection.

Fire Protection

Newton CDM 508 is fire rated to Euroclass E under BS EN 13501-1. The Technical Data Sheet states that this is the same as plastic-based insulation, and that the membrane must always be protected from fire by surface finishes in the same way insulation would be protected.

Where a project requires a higher fire performance, Newton Waterproofing Systems can provide fire-resistant membranes tested and classified to a fire rating of B-s2,d0. This should be treated as a separate specification decision and confirmed with Newton where the fire strategy requires a higher-performing membrane or specific fire-rated construction build-up.

Ventilation And Humidity Control

Ventilation is a design requirement for habitable spaces and is particularly important in basements and below-ground rooms. The Newton CDM Installation Manual refers to Part F of the Building Regulations 2010 and explains that adequate ventilation is required to extract water vapour and pollutants, supply outdoor air, dilute pollutants, disperse water vapour and support a healthy internal environment. Basements can be more difficult to ventilate naturally because the living space walls may be earth-retaining to several elevations.

BS 8102:2022 recognises that mechanical heating and ventilation often play an important role in creating the internal environment and controlling condensation, particularly where higher grades are required. For Grade 3 environments, the manual states that ventilation, dehumidification or air conditioning is necessary and should be appropriate to the intended use. Newton recommends that mechanical ventilation is included within the design of all Newton waterproofing systems.

Condensation risk must be considered. Warm air can hold more moisture than cool air, and when a cool surface falls below the dew point, condensation forms. In insulated basement constructions, less heat reaches the face of the waterproofing membrane, making the membrane surface cooler and increasing condensation risk. The risk is reduced by controlling relative humidity through ventilation.

The Newton CDM System includes a condensation collection safety mechanism. CDM BaseDrain has spacers on the reverse side of the upstand where it contacts the wall membrane, so any condensation forming on the face of the wall membrane can be received into the drainage channel. Where screed depth is greater than the 60mm back flange of the CDM BaseDrain, Newton CDM Condensation Strip should be used to provide the condensation gap. The manual notes that this gap should generally be left open unless there is a good reason for closing it. If the gap is sealed, such as in gas barrier designs, it is essential that the ventilation system works as designed.

Inspection Before Finishes

Before finishes are applied, Newton CDM 508 should be inspected carefully. Any repairs required during installation should be dealt with as they occur, rather than left until the end of the job. This reduces the risk of overlooked punctures, failed seals or poor joints being hidden behind finishes.

Once the Newton CDM System is installed and before dry lining, screeds, chipboard, battens or other finishes cover it, the membrane should be checked for damaged areas. All joints, laps, seals, fixing plugs, service penetrations, door reveals, floor junctions and vaulted details should be checked to make sure they are complete and properly bonded. Any necessary repairs should be carried out in accordance with the repair guidance before the membrane is concealed.

Repairs To Newton 508

If the wrong stud is drilled in error, the stud should be cleaned with a clean cloth and plugged with CDM Rope. The repaired area can then be covered with a small patch of CDM OverTape. The same repair method can be used where a fixing has not been achieved successfully due to drilling into unsound joints or weak structure, and where the CDM Fixing Plug expansion pin has not resolved the problem. The failed fixing should be repaired, and a new stud should be drilled for the replacement fixing.

If Newton CDM 508 is accidentally cut or pierced on a vertical wall, the surfaces should be cleaned with a clean cloth and sealed with CDM OverTape. The tape should bridge both edges of the cut and extend beyond the two furthest points of the damage by at least 25mm. Rips and ragged tears should be repaired using the same method, with CDM OverTape bridging the damaged area.

If a hole is created in the membrane, CDM OverTape can be used where the hole can be bridged in one piece with at least a 25mm margin around the damaged area. Larger damaged areas can be repaired by cutting a piece of wall membrane large enough to cover the hole with a margin beyond the damaged area. If the repair patch sits neatly into the studs, the edges can be sealed with CDM Joint Tape around the perimeter. If the studs do not interlock and a ridge is formed, CDM OverTape should be used to bridge around the perimeter of the patch onto the main membrane.

For floors and vaulted ceilings, repairs can be carried out using the same principles, but CDM OverTape must always be used to bridge or seal the damage. All surfaces to be sealed must be clean and dry before the repair is made. In some cases it is acceptable to warm the membrane and the CDM OverTape with a hot air gun to remove surface moisture and improve adhesion before sealing.

All repair work requires access to the system. If finishes have already been installed, they may need to be removed to reach the damaged membrane. In screeded floors, the screed must be removed with extreme caution to avoid causing further membrane damage. Where multiple damages have occurred in one section, it may be better to cut out and replace a larger section of membrane rather than patching many small defects.

Maintenance And Future Alterations

Newton CDM 508 itself requires little maintenance once installed and protected, but the full Newton CDM System does require ongoing inspection of drainage and pumping components. The manual states that pump and drainage maintenance should include cleaning and de-scaling the pumping system as required, checking free movement of the pump impeller, checking pump seals for leaks and renewing as required, carrying out an impeller test, inspecting discharge pipes for damage and leaks, removing debris from the base of the sump, checking electrical connections and fuses, and flushing the CDM BaseDrain and CDM FloorDrain drainage system. This should be carried out at least once per year by a competent person, with any additional pump manufacturer requirements also followed.

Sump pumps depend on electricity, so a constant power source is important to maintain drainage capacity. Newton Victron battery back-up systems are available to keep the sump discharge operating during power failure, but the battery capacity must be suitable for the volume of water that may need to be pumped during an outage.

Newton CDM membranes should not be pierced. If future works are proposed in the waterproofed area that may penetrate, disturb or affect the membrane, advice should be sought from the specialist installing company or Newton Waterproofing before the work is carried out. Even minor additions such as shelves, cupboards or other fixings should be checked with the installer so the correct fixing method can be advised and the waterproofing system is not compromised.

Key Limitations

Newton CDM 508 is not a standalone waterproofing product and has no capability to withstand water pressure by itself. It must be used as part of a Type C cavity drain waterproofing system that safely removes water from the building. Drainage, inspection access, pumping, discharge routes and maintenance must therefore be treated as part of the waterproofing system, not as optional extras.

The 500g/m² variants of Newton CDM 508, codes M1-5-48 and M1-5-40, must not be used for floors. Only Newton CDM System membranes with a density of 700g/m² or higher should be used for floor areas. Newton CDM 508 is also not suitable for gas protection systems, so projects requiring radon, methane or hydrocarbon protection need a different Newton specification.

Flat soffit applications are restricted. Do not apply Newton CDM 508 to flat soffits unless the soffit is at least 400mm narrower than the membrane being used, and then only by very experienced contractors. The soffit must have a fall, the membrane must not sag, and drainage must prevent ponding behind the system.

Floor slabs and rafts must be checked before installation. They should be flood tested to ensure they are flat and level, and the deviation limits relative to the drainage channel and sump datum must be followed. Any irregularities should be corrected by planing, grinding or using a suitable levelling compound such as Ardex Arditex NA.

Newton CDM 508 must be protected from fire, UV light, physical damage and wear. It should be stored upright in dry conditions between 5°C and 25°C and should not be exposed to freezing conditions or direct sunlight. The membrane must not be punctured during installation of finishes, battens, floors, services or later alterations.

Other Technical Information

Newton CDM 508 is manufactured from HDPE and is white in colour. It is supplied in 500g/m² and 700g/m² densities, with roll widths of 2.0m or 2.4m, a roll length of 20m and roll areas of 40m² or 48m². The membrane has an overall height of 8.0mm, a stud height of 7.0mm and a membrane thickness of 0.45mm. The working temperature is -50°C to +80°C, the service temperature is -40°C to +80°C, and the softening temperature is 126°C. Packaged weights are listed as 20kg, 24kg, 28kg or 33.6kg depending on the roll variant.

The installed performance data lists water tightness at 60kPa for 24hours as a pass to EN 1928. Tensile strength is listed as 416N in the machine direction and 488N in the cross direction to BS 12311-2. Resistance to static loading is greater than 20kg to BS 12730, and compressive strength is stated as 180kN to BS EN ISO 25619-2. Fire resistance is Euroclass E to BS EN 13501-1, and the membrane is classified as Type V application.

Newton CDM 508 is supported by BBA Agrément Certificate 22/6357 and is declared under BS EN 13967:2012 + A1:2017 as a waterproofing sheet for damp proof sheets, Type V. The declarations list water tightness at 60kPa for 24hours as a pass to EN 1928 and fire resistance as Euroclass E to EN 13501-1. The Technical Data Sheet also states that Newton CDM 508 is guaranteed against deterioration for 30 years and has a stated life expectancy of at least 100 years, although the waterproofing guarantee itself is provided by the specialist waterproofing contractor.

Newton CDM 508 is inert and non-polluting to drinking water, highly resistant to water, alkalis, saline solutions and organic acids, and is not affected by minerals or hydrocarbons. It is rot-proof and resistant to bacteria, fungi and small organisms. When specified, installed and protected correctly, and when isolated from UV light, physical damage and wear, its service life is stated as equal to the design life of the structure.

Q) What is Newton CDM 508 Membrane?

A) Newton CDM 508 Membrane is an 8mm studded cavity drain waterproofing membrane used as part of the Newton CDM System for below-ground waterproofing. It is designed to create a controlled drainage cavity behind internal finishes, allowing water ingress to be managed rather than trapped against the wall or floor surface. This makes it suitable for basements, cellars, tunnels, vaulted soffits and earth-retained structures where a Type C drained protection system is required. Newton CDM 508 is available in 500g/m² and 700g/m² variants, with the heavier 700g/m² version recommended for floors where additional robustness and compressive strength are required.

Q) How does Newton CDM 508 Membrane work?

A) Newton CDM 508 Membrane works by creating an 8mm cavity between the structure and the internal finish. Instead of acting as a direct barrier that tries to hold back water pressure, it allows moisture or water ingress to enter the cavity behind the membrane and then move safely towards drainage channels, outlets, sump chambers or pump systems. This drained protection approach helps relieve pressure and manage water in a controlled way. The studded profile keeps the membrane separated from the wall or floor, maintaining the drainage space. For the system to work properly, Newton CDM 508 must be used with correctly designed drainage, jointing, fixings and discharge arrangements.

Q) What is a Type C drained protection system?

A) A Type C drained protection system is a waterproofing approach that manages water ingress by collecting and draining it away, rather than relying only on stopping water at the external face of the structure. Newton CDM 508 Membrane forms part of this type of system by creating a cavity where water can move behind or beneath the membrane. That water is then directed to suitable drainage, such as Newton CDM BaseDrain, outlets, sump chambers and pumps where required. This makes Type C systems particularly useful in basements and below-ground rooms where groundwater levels, hydrostatic pressure and seasonal moisture conditions can change over time.

Q) Where can Newton CDM 508 Membrane be used?

A) Newton CDM 508 Membrane can be used on earth-retained walls, floors, vaulted soffits, tunnels, cellars, basements and similar below-ground structures requiring controlled water management. It is suitable for both refurbishment work and new-build waterproofing designs, provided the full Newton CDM System is correctly specified. On walls and vaults, the 500g/m² variant may be suitable depending on the project, while floors require the 700g/m² variant because floor areas experience greater loading and installation demands. Newton CDM 508 is especially useful where damp, water ingress or salt-contaminated masonry needs to be separated from the internal finish while still allowing water to drain safely.

Q) Is Newton CDM 508 Membrane suitable for basement waterproofing?

A) Yes, Newton CDM 508 Membrane is highly suited to basement waterproofing when used as part of a correctly designed Newton CDM System. It is intended for below-ground spaces where water ingress needs to be controlled and directed to a suitable drainage and pumping arrangement. In basement conversions, cellar refurbishments and habitable below-ground rooms, the membrane helps isolate the internal finish from damp or water-bearing substrates. When correctly designed, installed and combined with appropriate drainage, sump and pump systems, Newton CDM 508 can contribute to internal environments up to Grade 3 under BS 8102:2022, which is generally the standard expected for dry habitable spaces.

Q) What is the difference between the 500g/m² and 700g/m² versions?

A) Newton CDM 508 Membrane is available in 500g/m² and 700g/m² variants, allowing the correct grade to be chosen for the application. The 500g/m² version is suitable for many wall, vault and vertical applications where the membrane is mechanically fixed and then protected by an internal lining system. The 700g/m² version is recommended for floors because it provides greater robustness and resistance to compressive demands during installation and service. Floor areas may be exposed to foot traffic, insulation, screeds, chipboard, floor finishes and heavier loads, so the heavier membrane is the appropriate choice. The 500g/m² variant should not be used for floors.

Q) Can Newton CDM 508 Membrane be used on floors?

A) Newton CDM 508 Membrane can be used on floors, but only the 700g/m² variant should be used for floor applications. The 500g/m² version does not have the required compressive strength for that use. Before installation, the floor should be clean, level, free from sharp protrusions and suitable for drainage towards the designed outlet or sump point. Surface regularity is important because standing water beneath the membrane can lead to silt or lime scale build-up and affect drainage performance. The membrane should be laid with studs facing down, jointed correctly with Newton CDM Joint Tape and sealed to the drainage upstand or associated detail as specified.

Q) Can Newton CDM 508 Membrane be used on walls?

A) Yes, Newton CDM 508 Membrane can be fixed to below-ground walls constructed from suitable substrates such as concrete, brick and concrete block. It can be installed vertically or horizontally, depending on the wall height, membrane width and preferred jointing method. Horizontal installation may reduce the number of joints, while vertical sheets are lighter to handle but usually require more jointing tape. The membrane is mechanically fixed using appropriate Newton CDM fixing plugs, with fixing centres selected according to the internal lining system. Timber battens, metal framing, free-standing frames or blockwork linings may be used, but the membrane should not be punctured unnecessarily after installation.

Q) Is Newton CDM 508 suitable for vaulted soffits and arches?

A) Newton CDM 508 Membrane can be used on vaulted soffits, brick arches and similar curved below-ground structures, provided the installation is detailed correctly to prevent water ponding behind the membrane. Vaulted and overhead work needs careful fixing, lapping and sealing because water must be able to drain away safely. The rubber sealing washer supplied with some plugs should not normally be used for vaulted ceilings or soffits. Instead, Newton CDM Rope should be used around the fixing plug to create a compressed seal. Fixing alignment is also important because the fixings may later support battens or lining systems. Flat soffits are more restricted and require special consideration.

Q) Can Newton CDM 508 be used on flat soffits?

A) Newton CDM 508 Membrane should not be treated as a routine solution for flat soffits. Flat soffit installations are restricted because water can pond behind the membrane if there is not enough fall for drainage. The supplied guidance states that Newton CDM 508 should not be applied to flat soffits unless the soffit is at least 400mm narrower than the membrane being used, and only by very experienced contractors. The soffit must have a fall, the membrane must not sag, and the drainage path must prevent trapped water. If there is any uncertainty, technical advice should be sought before specifying this type of installation.

Q) What substrates are suitable for Newton CDM 508 Membrane?

A) Newton CDM 508 Membrane is suitable for use on walls made from concrete, brick and concrete block, and it can also be fixed to ICF construction where special longer fixing plugs are used. The substrate must be capable of receiving and holding the correct Newton CDM fixing plug securely. Weak, friable, crumbling or excessively uneven backgrounds should be repaired or addressed before installation begins. For floors, the 700g/m² variant can be used over suitable concrete rafts or slabs, and within relevant system build-ups over Newton Fibran XPS 500-C where specified. The key requirement is that the substrate supports secure fixing, controlled drainage and correct membrane detailing.

Q) How much surface preparation is needed before installing Newton CDM 508?

A) Newton CDM 508 usually requires less aggressive surface preparation than many direct-applied waterproofing systems, but the substrate still needs to be properly assessed and prepared. Timber, organic material, wallpaper, skirting boards and anything that could decay behind the system should be removed. Mould should be cleaned and sterilised, and rot should be dealt with by a specialist. Walls must be suitable for fixing, with severe depressions or unstable areas made good. Floors should be free from oil, debris, sharp protrusions and major irregularities. The surface does not need to be decorative-smooth, but it must allow the membrane, fixings, drainage and joints to perform correctly.

Q) Why is drainage important with Newton CDM 508 Membrane?

A) Drainage is essential because Newton CDM 508 Membrane does not hold back water pressure by itself. It forms part of a Type C drained waterproofing system, so water entering behind or beneath the membrane must be collected and removed safely. This normally involves drainage channels such as Newton CDM BaseDrain, inspection access, sump chambers, pumps and suitable discharge routes. Standing water should not remain beneath the membrane because it can encourage silt or lime scale deposits and reduce system performance. The drainage design must consider groundwater levels, expected water ingress, slab levels, pump capacity and maintenance access. Without suitable drainage, the membrane system cannot perform as intended.

Q) What fixing plugs are used with Newton CDM 508?

A) Newton CDM 508 Membrane is fixed with suitable Newton CDM fixing plugs selected for the substrate and installation detail. Newton CDM MultiPlugs are commonly used for standard wall applications, while Newton CDM NuSeal Plugs may be used where a different sealing method is required. Some plugs include a soft rubber sealing washer that seals the fixing to the wall membrane, but overhead and vaulted applications normally require Newton CDM Rope instead of a washer. Fixings are installed through membrane studs into pre-drilled holes, then driven home so the plug sits flush within the stud. The fixing pattern should suit the finish system, such as battens, metal track or free-standing linings.

Q) What fixing centres are used for Newton CDM 508 on walls?

A) Fixing centres for Newton CDM 508 depend on the internal finish being installed. Where timber battens are used, fixings are typically set at 600mm centres vertically and 400mm centres horizontally. For fixed metal track systems such as Gypliner, centres are generally 800mm vertically and 600mm horizontally. Barrel vaults require closer fixing, typically 300mm around the vault and 600mm down the vault. Free-standing timber frames, free-standing metal frames and free-standing block walls do not rely on the membrane fixings in the same way, so enough fixings should be used to keep the membrane neat, secure and reasonably tight, especially around corners, reveals and junctions.

Q) Can battens be fixed into Newton CDM 508 fixing plugs?

A) Yes, timber battens can be fixed into suitable Newton CDM fixing plugs without piercing the membrane, provided the correct screw size and length are used. Treated battens should be at least 25mm x 38mm, although 25mm x 50mm may provide better edge fixing for plasterboard. The fixing plug can accept 30mm of screw, typically using 5mm size 10 self-tapping screws. To work out screw length, add the batten thickness to the required embedment into the plug, without exceeding the 30mm depth accepted by the plug. Over-tightening or using screws that are too long can loosen the plug or risk damaging the waterproofing detail.

Q) Can Newton CDM 508 be plastered or rendered directly?

A) Standard Newton CDM 508 Membrane is not designed to be plastered or rendered directly because it is not a meshed membrane and does not provide a suitable plaster or render key. On walls and vaulted soffits, it should be protected with suitable internal finishes, such as floor-supported dry-lining frames, timber battens with plasterboard, metal framing systems or other specified lining methods. Direct plastering or rendering applies to Newton 508 Mesh, not standard Newton CDM 508. This distinction is important because applying wet finishes directly to a non-meshed cavity drain membrane can result in poor adhesion and finish failure. The chosen finish should protect the membrane without puncturing it.

Q) What internal finishes can be used over Newton CDM 508?

A) Newton CDM 508 Membrane can be finished with dry-lining systems, timber battens and plasterboard, free-standing timber or metal frames, fixed metal track systems, or block and brick walls built in front of the membrane where specified. On floors, suitable protection may include screed, tongue-and-groove chipboard, insulation with screed or chipboard above, timber floor systems or underfloor heating tray build-ups with screed. Any finish must be installed without puncturing the membrane unless the fixing method is designed through the Newton CDM plug system. The finish should also protect the membrane from UV light, physical damage, wear and fire exposure, as the membrane is not intended to remain exposed.

Q) How are joints in Newton CDM 508 Membrane sealed?

A) Joints in Newton CDM 508 Membrane are sealed using the appropriate Newton CDM accessories for the joint type. Flanged joints and stud-into-stud laps are normally sealed with Newton CDM Joint Tape, applied between the membrane surfaces before the joint is pressed firmly together. Newton CDM Rope is used where a flange seal is not possible, where a washer seal is unsuitable, or for irregular details. Newton CDM OverTape is used for repairs, abutting joints, reveal details, floor-to-drainage upstands and connections between floor and wall membranes. The membrane surfaces should be clean and dry before sealing, and a heat gun may be used carefully to assist adhesion in cold or damp conditions.

Q) How should service penetrations through Newton CDM 508 be handled?

A) Service penetrations through Newton CDM 508 should be avoided wherever possible because they interrupt the continuous waterproof layer and create potential weak points. Where pipes, cables, conduits or other services must pass through the membrane, the membrane should be trimmed neatly and the detail sealed carefully using appropriate Newton products such as Newton CDM Rope, Newton CDM OverTape, Newton Pipe Collar or Newton Pipe Sleeve. In some cases, a patch of Newton DampSafe 809-HP DPC may be used and sealed around its perimeter. For vaulted soffits and arches, services should ideally be re-sited to a vertical surface or grouped through a sealed sleeve detail where possible.

Q) Does Newton CDM 508 need protection after installation?

A) Yes, Newton CDM 508 must be protected after installation. Its long-term service life depends on being properly specified, installed and covered by suitable finishes so it remains isolated from UV light, physical damage, abrasion, fire exposure and wear. On walls, this normally means dry-lining, battens with plasterboard, free-standing frames or other approved lining systems. On floors, the membrane may be protected by screed, chipboard, insulation and floor finishes, depending on the system build-up. It should not be left exposed to long-term sunlight, trafficking or impact. Future work in the area should also avoid drilling or fixing through the membrane unless the detail has been approved.

Q) Is Newton CDM 508 fire rated?

A) Newton CDM 508 Membrane is classified as Euroclass E under BS EN 13501-1. This means it must be protected from fire by suitable surface finishes, in a similar way to plastic-based insulation materials. It should not be left exposed where fire performance is required from the finished construction. Where a project requires higher fire performance, Newton can provide fire-resistant membranes tested and classified to B-s2,d0, but that would be a separate specification decision. Fire strategy should be considered at design stage, especially in habitable basements, commercial spaces, escape routes or areas where building control requirements demand a particular fire-rated construction build-up.

Q) Is Newton CDM 508 suitable for gas protection?

A) Newton CDM 508 Membrane is not suitable for gas protection systems. It should not be relied upon for radon, methane or hydrocarbon gas protection. Where a project requires gas resistance as well as waterproofing, the specification should be changed to an appropriate Newton gas-rated system rather than using standard CDM 508. This is an important limitation because below-ground structures can be affected by ground gases as well as water ingress, and the two risks must be addressed correctly. The waterproofing design should be based on site investigation, ground conditions and project requirements. If gas protection is needed, the correct gas-rated membrane system should be specified from the outset.

Q) What technical performance does Newton CDM 508 offer?

A) Newton CDM 508 is manufactured from HDPE and has an overall height of 8.0mm, with a stud height of 7.0mm and a membrane thickness of 0.45mm. It is available in 2.0m or 2.4m roll widths, 20m roll lengths and roll areas of 40m² or 48m². The membrane passes water tightness at 60kPa for 24hours to EN 1928, with tensile strength listed as 416N in the machine direction and 488N in the cross direction to BS 12311-2. It has resistance to static loading greater than 20kg, compressive strength of 180kN and a service temperature range from -40°C to +80°C.

Q) Is Newton CDM 508 certified?

A) Yes, Newton CDM 508 Membrane is supported by BBA Agrément Certificate 22/6357 and is declared under BS EN 13967:2012 + A1:2017 as a waterproofing sheet for damp proof sheets, Type V. It is also associated with BS 8102:2022 design guidance when used within a correctly specified Type C drained protection system. The supplied information states that Newton CDM 508 is guaranteed against deterioration for 30 years and has a stated life expectancy of at least 100 years, or equal to the design life of the building when correctly installed and protected. The waterproofing guarantee itself is normally provided by the specialist waterproofing contractor.

Q) What are the main limitations of Newton CDM 508 Membrane?

A) Newton CDM 508 Membrane is not a standalone waterproofing product and has no ability to withstand water pressure by itself. It must be used as part of a correctly designed Type C drained protection system with suitable drainage, inspection access, pumping and maintenance. The 500g/m² variants must not be used on floors, and standard CDM 508 must not be used for gas protection. Flat soffit applications are heavily restricted and should only be considered by very experienced contractors where drainage and fall are suitable. The membrane must also be protected from UV light, fire, physical damage and puncturing, and future alterations should be checked before any fixings are made.

Q) Does Newton CDM 508 require maintenance?

A) Newton CDM 508 itself requires little maintenance once installed and protected, but the full Newton CDM System requires regular inspection and servicing of drainage and pumping components. Sump pumps, drainage channels, discharge pipework, inspection ports and associated components should be checked and cleaned by a competent person, typically at least once per year. Maintenance may include removing debris from sump chambers, checking pump impellers, testing pump operation, inspecting discharge routes, flushing Newton CDM BaseDrain or CDM FloorDrain and checking electrical connections. Battery back-up should also be considered where pump failure during a power cut could create a flood risk. The membrane should not be pierced or altered without specialist advice.

Technical Data Sheet

Newton CDM Installation Manual

Declaration of Performance (DoP)

BBA Certificate