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How to Waterproof a Basement

Before we start to waterproof a basement, we have to choose the correct product and contractor. The contractor must have accreditation and experience with sealing the basement area.

The walls should be clean and free from render and plaster so that we are keying onto the block/brickwork A ‘slurry’ coat is then mixed and applied to wall details 2 no cots should be applied to the wall surfaces and a generous coat should be applied with a brush or spray. Make sure that there are no ‘seeping’ points at the water junctions, and this should be allowed to dry out roughly for a 24hr period (depending on air temperature).

Once fully cured and inspected, making sure no salt is leaching through from the earth wall behind the retaining wall. Once the slurry coat has dried a ‘liquid waterproof’ coating is applied in 2no coats. Each coat being applied horizontally + vertically, for the floor detail this has to be applied as above and the fillet/wall bottom meets the vertical has to be coated with a 100mm over sail.

The liquid is the applied the same way in 2no passes this is also allowed to dry. The floor is then screeded or tiled etc... with no floor fixings being applied through the waterproof membrane. As for the walls these should not be painted straight onto the waterproof coating but either dot + dabbed with plasterboard, or a multi finish plaster applied.