Cavity drain membranes works by allowing water to continue to penetrate the structure but control it in the air gap and divert it to a suitable drainage point or pump (if required). Cavity membranes do not allow pressure to build up against the internal construction, and the air gap behind the membrane allows the structure to ‘breathe’ and dry out. The membranes are impermeable to water, and gas and water vapour, thus protecting the basement internal space from dampness.

Membranes are loose laid on floors and fixed to walls using special plugs and sealing materials. Cavity membranes can be fitted with little or no preparation to the substrate. Once fitted, wall surfaces can be dry lined or plastered directly, and floors can be screeded, or a suitable dry board system installed. This method of basement waterproofing allows decoration and floor finishes to be completed almost immediately, without long drying out periods.

Typical areas of use:

  • Existing basement waterproofing
  • Retrofit
  • New Build