Cavity Drainage Membrane

RIW Cavity Drainage Membrane is an internal tanking cavity drainage membrane system used to collect water entering the basements and sub-structures and channel it to a sump or collection point for disposal. RIW Cavity Drainage Membrane is a 1mm thick high density polyethylene drain board with 20mm studs used in situations where site conditions or structural design make it difficult or impossible to use traditional tanking methods.

When designing Type C structures (as classified in BS8102:2009), the product applied correctly, RIW Cavity Drainage Membrane is capable of providing the levels of protection required for grades 1, 2 & 3 basements.

• Internal Tanking of basements
• Sub-structures & retaining walls