Wykamol CM3 Cavity Drain (Non Mesh) Membrane is a high‑quality, 3mm studded HDPE membrane designed for use in Type C cavity drain waterproofing systems. Engineered to manage moisture in both new‑build and refurbishment projects, it creates a controlled drainage space that channels water safely to a suitable discharge point, helping achieve a Grade 3 habitable environment in accordance with BS 8102. Its tough, flexible construction makes it ideal for basements, cellars, retaining walls, and other below‑ground structures where long‑term damp protection is essential.
The membrane’s stud profile forms an air gap between the substrate and internal finishes, allowing moisture to move freely without pressure build‑up. This ensures that walls can continue to breathe while preventing water ingress from affecting internal spaces. CM3 is lightweight, easy to cut, and quick to install using standard fixing plugs and sealing accessories, making it a practical choice for contractors and waterproofing specialists.
Suitable for use behind dry‑lining systems, timber battens, or independent stud walls, Wykamol CM3 provides a reliable barrier that supports a wide range of finishing options. Its durability and resistance to chemical and environmental degradation ensure long‑lasting performance, even in challenging conditions.
20m long, 2 m wide.
Can be bought by the metre (£7 per m).
Key Benefits
- 3mm studded HDPE membrane providing reliable moisture management
- Suitable for Type C cavity drain systems in line with BS 8102
- Creates a ventilated air gap to relieve hydrostatic pressure
- Ideal for basements, cellars, and retaining walls
- Easy to cut and install using standard fixings and seals
- Compatible with dry‑lining and stud wall systems for flexible finishing options
