Wykamol CM8 Cavity Drain (Non Mesh) Membrane is a durable, high‑performance waterproofing membrane designed for use in Type C (drained protection) systems for basements, cellars, retaining walls, tunnels, and other below‑ground structures. Manufactured from tough high‑density polyethylene (HDPE), its 8mm stud profile creates a reliable drainage void that channels groundwater safely toward perimeter drainage channels and sump systems, helping achieve a Grade 3 habitable environment in line with BS 8102 requirements.
Engineered for versatility and minimal surface preparation, CM8 can be applied to walls, floors, vaults, and tunnels, and is equally suitable for internal above‑ground waterproofing where traditional plaster finishes are not appropriate. The studded design forms an air gap that relieves hydrostatic pressure, allowing moisture to move freely behind the membrane without penetrating internal finishes. This makes CM8 ideal for dry‑lining systems, including timber battens and steel framing, which can be fixed directly through the membrane using appropriate plugs.
CM8 is lightweight, easy to cut, and simple to install, making it a practical choice for contractors working on both refurbishment and new‑build projects. Its robust HDPE construction provides long‑term resistance to salts, contaminants, and environmental degradation, ensuring dependable performance even in challenging conditions.
20m long, 2.2 m wide.
also sold by the metre (£8 per m).
Key Benefits
- 8mm studded HDPE construction providing enhanced drainage capacity
- Suitable for Type C waterproofing in accordance with BS 8102
- Minimal surface preparation required for installation on walls, floors, and tunnels
- Creates a ventilated air gap to relieve hydrostatic pressure and manage moisture effectively
- Compatible with dry‑lining systems including timber battens and steel framing
- Durable, chemical‑resistant HDPE ensuring long‑term waterproofing performance
