CM8 Cavity Drain Membrane

CM8 Cavity Drain Membrane: Durable Waterproofing Solution

The CM8 Cavity Drain Membrane is a premium 8mm studded membrane, available in both 500g or 700g densities, suitable for Type C waterproofing applications. It delivers a grade 3 environment in compliance with BS8102:2009 and NHBC Chapter 5.4. The CM8 HD700 is recommended when a heavier, denser membrane is necessary, as advised by the Wykamol Technical Department.

Key Advantages

• Perfect for use in Type C cavity drain membrane system in line with BS8102:2009.
• Quick to install with minimal preparation necessary for wall surfaces.
• Can be easily cut down using a sharp blade.
• Allows immediate redecoration with no drying out process.
• Causes little or no damage to existing structures.
• Tolerates both low and high temperatures.
• Converts damp/wet conditions into dry, habitable spaces.
• Waterproof, salt inhibiting, root and contaminate resistant.

Typical Uses

• Ideal for walls, floors, vaults, tunnels, and both above and below ground level. It can be used in waterproofing applications and damp-proofing applications.

Substrate Preparation

• Concrete slabs must comply with BS 8204-1:2003+A1:2009 for new construction.
• Surfaces should be leveled with the help of Wykamol’s Universal Mortar.
• Walls suffering from mould or masonry fungi should be brushed clean and treated with Microtech Biocide before the membrane is installed.
• Dry rot in walls necessitates a detailed assessment before application.

Application

• The membrane is fixed using Wykamol CM Brick Plugs with the studs facing the wall.
• It’s recommended to apply Wykamol Microsealer to the concrete walls and slab, before applying CM8, to prevent lime efflorescence and dusting.

Finishing and Aftercare

• The membrane can be finished using a stud frame or dot and dab dry lining methods.
• CM8 Membrane may be overlaid with closed-cell insulation before laying T&G flooring or can be layered with a conventional 65mm of sand and cement screed.
• Normal decorating materials can be used as soon as the floor, screed or plaster finishes are dry.