WPA 400 is an elastomeric, fibre reinforced waterproofing membrane based on high performance polymer technology. Designed for a range of under tile waterproofing applications, WPA 400 offers excellent adhesion properties and outstanding low water vapour transmission properties. Fully compatible with polymer modified cement based tile adhesives, screeds and renders. The unique formulation provides excellent workability and film build. Class III membrane in accordance with ASNZS 4858 & AS 4654.1.