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GCP Applied Technoloigies (Formerly Grace) Preprufe 300R & 160R Pre-applied waterproofing membranes that bond integrally to poured concrete for use below slabs or behind basement walls on confined sites


Product Data Sheet



  • Forms a unique integral seal to concrete poured against it. This prevents water migration and makes it unaffected by ground settlement beneath slabs.
  • Fully-adhered watertight laps and detailing
  • Provides a barrier to water, moisture and gas – physically isolates the structure from the surrounding ground.
  • BBA Certified for basement Grades 2, 3, & 4 to BS 8102:1990
  • Zero permeance to moisture
  • Solar reflective - reduced temperature gain
  • Simple and quick to install, requiring no priming or fillets.
  • Can be applied to permanent formwork - allows maximum use of confined sites.
  • Self protecting - can be trafficked immediately after application and ready for immediate placing of reinforcement.
  • Unaffected by wet conditions - cannot activate prematurely.
  • Inherently waterproof, non-reactive system: - not reliant on confining pressures or hydration - unaffected by freeze/thaw, wet/dry cycling
  • Chemically resistant, effective in all types of soils and waters - protects structure from salt or sulphate attack.


Preprufe® 300R & 160R membranes are unique composite sheets comprising a thick HDPE film, an aggressive pressure sensitive adhesive and a weather resistant protective coating.

Unlike conventional non-adhering membranes, which are vulnerable to water ingress tracking between the unbonded membrane and structure, the unique Preprufe seal to concrete prevents any ingress or migration of water around the structure.

The Preprufe R System includes:

  • Preprufe 300R - heavy-duty grade for use below slabs and on rafts (i.e. mud slabs). Designed to accept the placing of heavy reinforcement using conventional concrete spacers.
  • Preprufe 160R - thinner grade for lighter applications and reverse tanking (i.e. blindside zero property line) applications against permanent formwork such as soil retention systems.
  • Preprufe Tape LT - for covering cut edges, roll ends, penetrations and detailing (temperatures between -4°C and +30°C).
  • Preprufe Tape HC - as above for use in Hot Climates (minimum10°C).
  • Liquid Membrane - for sealing around penetrations, etc.

Preprufe 300R & 160R membranes are applied either horizontally to smooth prepared concrete or well rolled and compacted sand or crushed stone blinding; or vertically to permanent formwork or adjoining structures. Concrete is then cast directly against the adhesive side of the membranes. The specially developed Preprufe adhesive layers work together to form a continuous and integral seal to the structure.

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