Document Status
Current
Supplement
Core Supplement
Series
Certificate
Abstract
Relates to Wykamol CM20 Cavity Drain Membrane, a high-density polyethylene (HDPE) membrane for damp-proofing walls, floors and ceilings that require a large air gap for a high drainage volume, in new construction or in existing buildings. The system can be used above or below ground, over a contaminated or damp background, to support a dry lining or flooring. It may also be used as part of a gas protection system to restrict the ingress of radon. Key factors assessed were mechanical resistance and stability, safety in case of fire, hygiene, health and the environment, safety and accessibility in use, protection against noise, energy economy and heat retention, sustainable use of natural resources, and durability.
History
Date of Issue: 26 September 2025. Supersedes Certificate no. 18/5595.
Subjects
- Coverings and surface finishes
- Waterproofing/damp proofing
Publisher History
The British Board of Agrément have been providing authoritative and independent information on the performance of building products for over 40 years. The certificates they produce contain data on durability, installation and compliance with Building Regulations.