Basement waterproofing - Type C membrane

Type C waterproofing is defined in BS 8102: 2009 as ‘drained protection’. This is achieved by the incorporation of a drained cavity within the basement structure. The basement wall must provide enough primary resistance to water ingress to ensure the cavity only accepts a controlled amount of water or dampness. Water is collected in the cavity, between the external wall and an internal lining (cavity drain membrane), and diverted to a suitable drainage point.
The use of cavity drain membranes does not allow pressure to build up against the internal construction. The air gap allows the structure to breathe and, to some extent, dry out. Cavity drain membranes are laid on floors and fixed to walls using special plugs and sealing materials, with little or no preparation required to the substrate. Once the membrane has been fitted, wall surfaces can be dry lined or plastered directly, and floors can be screeded or a floating dry board system installed.
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