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BBALogoCertNo 3010Newton CDM 508R is a high quality, 8mm cavity drain membrane & gas barrier that is heavier and stronger than standard 8mm membranes, and is certified for use as a barrier to ground gases and hydrocarbons. The membrane is installed within the Newton CDM System, our internally applied waterproofing system that also includes drainage and pumping systems.

CDM 508R is suitable for the waterproofing of earth retained walls, vaulted soffits and floors and is guaranteed against deterioration for 30 years, with a life expectancy of the design life of the building (DIN 9001:2000), and supported by BBA Certification Number 94/3010.

CDM 508 eco Floor is inert and non-polluting to drinking water, 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 small organisms. The membrane also holds test data that exhibits its high compressive loading stability.

Newton CDM 508R is independently tested as an effective barrier to radon ground gases, methane, CO2 and hydrocarbons. It is also the chosen membrane for use within our patented combined ground gas and waterproofing system, Newton PAC-500.

  • Key Benefits
  • Typical Applications
  • British Standard 8102:2022
  • Technical Data
  • Available across the UK
  • Key Benefits

    Key Benefits

    • Third-party tested for long-term compressive load to ISO 25619-1 (2% compression over 50-years)
    • Does not require extensive and damaging preparation to the wall surface
    • Speed of installation
    • Provides vapour control used with humidity control systems, capable of delivering an environment to all levels within a Grade 3 environment to BS 8102:2022
    • Independently certified as a barrier to hydrocarbon gases, radon, methane and CO2
    • Resistant to rot, chemically aggressive groundwater, acids and alkalines, efflorescing salts and hydrocarbon contamination

    Typical Applications

    Typical Applications

    Wall and floor membrane as part of the Newton CDM Type C waterproofing system.

    Suitable Substrate – Walls

    • Concrete
    • Brick
    • Concrete block
    • ICF – With special longer fixing plugs

    Suitable Substrate – Soffits

    • Concrete – To fall
    • Brick – Arched or vaulted

    Suitable Substrate – Floor

    • Concrete raft or slab
    • Newton Fibran XPS 500-C closed cell extruded polystyrene insulation (see section on page 5 for further information)
    • Slab/raft – 508R & 508 eco Floor

    British Standard 8102:2022

    British Standard 8102:2022

    The British Standard 8102:2022 Code of Practice for Protection of Below Ground Structures Against Water Ingress is the main design guide for structural waterproofing in the UK.

    The Newton CDM System is a maintainable system, so complies with BS 8102 requirements. The standard also specifies that: “a waterproofing specialist should be included as part of the design team so that an integrated waterproofing is created”

    Therefore it is our recommendation that the Newton CDM System is installed by a Newton Specialist Contractor (NSBC).

    Technical Data

    Technical Data

    Features Result
    Material HDPE
    Colour White
    Density 700 g/m2
    Width 2.0m / 2.4m
    Length 20m
    Area 40 / 48m²
    Height 8.0mm
    Membrane thickness 0.8mm
    Stud Depth 7.2mm
    Vicat softening temperature 126ºC
    Packaged weight 28.0kg / 33.6kg
    Service Temperature -40 to +80ºC
    Installed Performance Result
    Compressive strength – Temporary 280 kPa
    Compressive strength – Permanent 7 kPa
    Compressive strength – Permanent – with studs filled with C16 screed 800 kPa
    Thermal Conductivity 0.461 W/mK
    Water vapour resistance – Sd value >604m
    Water vapour resistance – μ value >1208000μ
    Water vapour diffusion resistance >3020 MNs/g
    Resistance to fire – Euroclass Not tested – F*
    Chemical resistance – Excellent 100%
    Oxidation resistance – Excellent 100%
    Radon gas resistance – Membrane 3.1 x 10-12 m²/s
    Radon gas resistance – Joints 2.7 x 10-12 m²/s
    ¹Resistance to liquid hydrocarbons** Passed
    Carbon dioxide permeability** 1.36 x 10-8- m²/s
    Methane permeability** 1.42 x 10-8 m²/s
    Carbon dioxide transmission rate 318ml/(m².d.atm)
    Methane transmission rate 63.1ml/(m².d.atm)


    The 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. *Newton Waterproofing Systems can provide fire-resistant membranes that are tested and classified to a fire rating of B-s2.d0. Get in touch directly for more information. **At time of testing the membrane was called Newton 508. Name changed to CDM 508R to reflect the gas and liquid hydrocarbon capabilities. The current Newton CDM 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 Durability, E & FN Spon, London, UK, pp 226-230. All test certificates are available by request.

    Available across the UK

    Available across the UK

    Cavity Drain Waterproofing Solutions Across the UK

    We provide cavity drain waterproofing products and solutions across the whole of the UK:

    Speak to our friendly, expert team

    Our staff are able to provide guidance for projects of all sizes, whether you require some general advice about damp or waterproofing, or support with technical drawings and specifications.

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