Cavity Drain Membrane

Cavity Drain Membranes

A crucial part of the waterproofing process is the selection of the correct cavity drain membranes

Cavity Drain Membrane provides an alternative way or waterproofing walls to the traditional cementitious tanking systems.

Cavity Drain Membrane is an internally applied basement wall / floor waterproofing system based upon a range of tough and durable cavity drainage membranes. As opposed to traditional tanking that works by holding back the water and pressure; wall cavity drainage membrane works by allowing the water to continue to penetrate through the wall to then control the water within the air gap between the wall cavity drainage membrane and the wall. The flow of the water is then controlled through perimeter drainage channel and directed to a suitable drainage point or sump pump. Once the cavity wall drainage membrane has been fitted, wall surfaces can be dry lined or plastered directly.

Timberwise Cavity Drain Membrane is suitable for use in accordance with BS 8102:1990 to provide Type ‘C’ drained protection to structures below ground giving a Grade 3 or 4 dry environment suitable for domestic or commercial use. It is essential that Timberwise Cavity Drain Membrane
is used in conjunction with a suitable sump and pump facility (unless passive drainage is available on one side of the building) and that this is maintained throughout the lifetime of the installation. To control the risk of condensation it is recommended that all basements should be provided with mechanical ventilation to ensure adequate air circulation in accordance with the guidelines in Approved Document F (BuildingRegulations 2005).

The advantages of using Cavity Drain Membrane

With our basement wall cavity drainage membrane, it prevents pressure from building up against the internal wall structure and the air gap behind the membrane allows the structure to breathe and to some extent to dry out. As King Canute found out stopping the flow of water is not always the best solution! Some times it is better to control the flow – thus giving predictable results.

Moreover, cavity drain membrane does not impose any load onto the structure or wall, it is also easier to install than some other waterproofing systems, modern, easier to repair should there be a problem with the system at some point, flexible, maintainable and importantly guaranteed.