What is a Basement Waterproofing Membrane?

Waterproof membranes are HDPE barriers that block the passage of water. They have an egg-tray-like shape. The stand-off studs form an air gap between the structure and the habitable space. The void serves as a drainage channel. Hence, they are also known as cavity drain membranes.

The studded membrane isolates wet cellar walls and floors from dry internal surfaces. Any water seeping through the basement structure drains behind the membrane into channels and sumps. From there, pumps discharge the flow to an outside drain. The system complies with BS 8102 for Type C waterproofing. It is simple to use in new-build and existing buildings.

Which Cavity Drain Membrane is Suitable for Cellar Floors?

You can use a CM 8 mm or a CM 20 mm. The decision rests on the amount of potential water intrusion. The former has a drainage capacity of 4.95 litres per sqm and the latter more than 14. You also have the option to buy the 20 mm waterproof membrane in a bright yellow colour. The contrast between the hi-viz plastic and the black rubber tapes makes sealing the joints easy.

What is the Right Membrane for Tanking Basement Walls?

For waterproofing walls, our 8 mm studded membrane is the most popular. It comes in two forms. The first isWykamol CM 8. Use this product if you want to fit a stud wall in front of the barrier. The second option is our CM 8 Mesh. It has a mesh layer that provides a key for a range of finishes. You can plaster directly onto the mesh. You can also use a dot and dab plasterboard adhesive.

Twistfix offers more basement tanking options. You can choose from the following range of watertight barriers.

Use our two-layer cavity membrane for external use on new-build basement projects. The product includes a geotextile mat. This external drainage and protection sheet fits on the outside face of the structure. It blocks the passage of water and contaminants from the surrounding soil.

Our 3 mm air gap membranes come with a mesh surface. The mesh face allows for the direct application of plaster. They are ideal for use in isolating damp surfaces from internal finishes. The low-profile studs make the Wykamol 3 mm tanking membrane ideal for use after damp-proofing. You can also use it in wet rooms and showers.

Our basement tanking systems form trustworthy watertight barriers. Each waterproofing membrane is BBA Approved and compliant with BS 8102.

We stock cavity drain membranes in various roll sizes and stud depths. We offer trade prices and fast delivery across the UK. Don't hesitate to contact us for advice on choosing the best type of waterproof membrane for your needs. Our expert team are always happy to help.