nternal tanking is the provision of a waterproof internal tanking membrane to the inside of the basement or sub-structure in accordance with BS8102:2009 (Type A – Barrier protection). When selecting a suitable internal tanking membrane system, consideration should be given to the form of construction, ground water levels, ground drainage, soil type and ground contamination.
When internal basement tanking with applied membranes, you must allow for hydrostatic pressure acting upon the membrane, and therefore a ‘loading coat’ may be required. Sub-soil drainage systems should also be incorporated into the design, when required.
A cavity drainage system within the basement or sub-structure is the provision of a continuous pre-formed cavity, which intercepts and drains
away incoming water in accordance with BS8102:2009 (Type C – Drained protection).
There is a permanent reliance on this cavity to collect groundwater seepage through the structure and channel it to drains or a sump for removal by drainage or pumping. When selecting a suitable drainage cavity system the external basement structure must provide enough resistance to water ingress to ensure the cavity only accepts a controlled amount of water. When specifying a cavity drainage system, due consideration should also be given to the form of construction, ground water levels, external ground drainage, soil type and ground contamination.
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