Almost all basement structures are likely to be subjected to water pressure during some period of their life.
For basements up to 4m in depth, the waterproofing system should be designed for a head of water three-quarters the depth of the basement. In deeper basements the head of water can be expected to be 1m below ground level.
BS8102:1990 considers that ‘drained protection’ in other words, a cavity drain membrane fitted to the structure is the most effective and trouble free type of water resisting construction.
Cavity drain membranes allow for moisture ingress to be controlled and drained and discharged from the structure. When a cavity drain system is affixed to the walls and floor structure this creates a dry and habitable inner environment whilst the water proofing carries on, unnoticed behind the system.
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