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DampSafe 809-HP DPC

A high-performance polymeric, radon rated, DPC which will not extrude under load, up to the point of compressive failure of the wall. It will also not adversely affect the ability of a properly designed and built wall to sustain and transmit compression.

Available in eight widths from 100 to 900 mm.

DampSafe 809-HP DPC is compatible with all commonly used building materials and is suitable for horizontal, vertical and stepped damp proof courses, including cavity trays, in cavity or solid masonry walls, and is also suitable for extending the floor membrane through internal and spine walls within our Newton CDM System.

  • Key Benefits
  • Typical Applications
  • Suitable Substrate
  • Technical Data
  • Key Benefits

    Key Benefits

    • Extremely tough and durable
    • Will not deform or extrude under high compressive loads
    • Complete system includes cloaks and accessories
    • Flexible at low temperatures
    • Resistant to shrinkage
    • Effective barrier to water and water vapour
    • Bond of DampSafe 809-HP DPC is greater than the bond between mortar and brick

    Typical Applications

    Typical Applications

    Suitable Substrate

    Suitable Substrate

    • Brick & Block
    • Stone
    • Concrete
    • High load insulated wall courses such as Marmox Thermoblock and Foamglas Perinsul

    Technical Data

    Technical Data

    Installed Performance Result

    Resistance to static load (10 mm steel ball)


    Shear resistance of joints – longitudinal

    100 N/mm2

    Shear resistance of joints – traverse

    250 N/mm2

    Durability (Alkali, Annex C – 50% elongation)


    Elongation at break – longitudinal

    Elongation at break – traverse


    Resistance to tearing (nail shank) – longitudinal 170N
    Resistance to tearing (nail shank) – traverse


    Flexibility at low temperatures ≤40oC
    Durability against heat ageing – 60 kPa


    Radon permeability 18 x 10(-12) m/s
    Radon transmittance 21 x 10(-12) m/s
    CO2 permeability 1.59 x 10(-12) m2/s/Pa
    Water vapour diffusion resistance – Sd value 350m
    Reaction to fire (Euroclass) E




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