Harrison Waterproofing is an authorised and recommended installer for the two leading methods of internal waterproofing systems in Britain.

Where the water pressure is particularly high, where noise and dust are likely to cause concern or where it’s required to retain the existing features of a building, we generally recommend a Cavity Drain Membrane (CDM) system, to control damp or water ingress.

With a CDM system any moisture is allowed to pass through the masonry. Thereafter it’s controlled by the use of a waterproof, ‘eggbox’ design, High Density Polyethylene membrane, attached to the masonry.

Waterproofing Harrison Waterproofing

Once an area is waterproofed, we can either render directly on to the CDM or provide a ‘dry line’ plaster finish.

Where there is not a gravity fed option, the Cavity Drain Membrane system is supported by a pumped system.

We have installed the Sika water-proofing system in basements, lift pits, underground tunnels, bridges, underground vaults, reservoirs and swimming pools.