Cavity Drain Tanking Membrane: Cavity drain membrane systems can be used in all below-ground building structures that are affected by dampness or water ingress especially from water under pressure from a high water table
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. The robust polyethylene basement lining membrane forms a sealed envelope within the building. Its dimpled profile – similar to a rigid bubble wrap – creates a continuous air cavity between the original cellar wall and the back of the membrane, where ample water drainage and air circulation allows underlying substrate to both drain and breath.
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The membranes are attached to the walls by special compression plugs that do not puncture the membrane and are laid loose over the floor area. The wall membrane is then plasterboarded over and the floor membrane is either screeded or fitted with a floating floor. The membrane lengths are double joint taped for strength and water tightness.
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In areas of high water pressure and no natural land drainage a sump chamber and drainage channels are also built into the floor to feed pressured water to a submersible pump.
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