Waterproof Membranes

Cavity waterproofing membranes are commonly used in basement systems to help protect the structure from the damaging effects of water ingress. They are typically installed on the interior face of the structure and are used as a form of damp proofing to help prevent problems associated with dampness, like mould growth and structural damage.

There are a variety of different types of cavity waterproofing membranes available, but they all work on the same basic principle. They create a barrier between the wall of the basement and the interior of the structure, helping to prevent water from penetrating into the building.

Dual v6 Cutaway 800

CM8 Membrane


CM8 Mesh Membrane

PowerMaxx2 -Transparent 800

CM20 Membrane

Here are a few key points about cavity waterproofing membranes:

Cavity waterproofing membranes are often made from high-density polythene (HDPE) or polypropylene. These materials are selected for their excellent water resistance, durability, and relatively easy installation.

Most waterproofing membranes have a dimpled design. The dimples create an air gap between the wall and the membrane, which allows water to flow down to a drainage system instead of seeping into the wall.

Waterproofing membranes are usually fixed to the walls with special plugs or adhesive. In some cases, they may also be mechanically fastened. It’s essential that they’re installed correctly to prevent any water from bypassing the membrane.

In conjunction with the membrane, a drainage system is often installed at the bottom of the wall. This allows any water that does get through to be efficiently drained away, preventing any build-up of water pressure against the structure.

Waterproofing membranes can be used on new constructions as well as in existing structures. In the latter case, they’re often used as part of a basement conversion or refurbishment project.

One of the advantages of cavity waterproofing membranes is that they’re generally low maintenance. Once installed, they should provide many years of reliable service. However, it’s still crucial to carry out regular checks to ensure that the membrane hasn’t been damaged and that the drainage system is still functioning correctly.

It’s worth noting that while cavity waterproofing membranes can be highly effective at managing water ingress, they’re typically only one part of a comprehensive basement waterproofing strategy. Other components can include exterior waterproofing measures, sump pump stations, Monitored alarms and battery backups. The correct approach will depend on a range of factors, including the local climate, the water table, and the specific construction of the building, so ask our experts to help you find the right product for your project.