Basement waterproofing is required when a structure or property, or part of a property, is built at ground level or below. It is likely that there will be a build up of water in the ground surrounding the basement, raising the water table, leading to hydrostatic water pressure. This water pressure is exerted on the floor and walls of the basement and can lead to water penetration through cracks, joints and structural weaknesses in the basement. Without basement tanking this water ingress can then lead to mould, decay, structural problems and other damp-related issues.
Basement Waterproofing Methods
Basement waterproofing can be achieved in two ways, either by blocking the passage of water into the building with external waterproofing or cementitious waterproofing. Or you can control the ingress and flow of the water to a pre-determined evacuation point by the use of cavity drainage systems.
Cementitious tanking materials are used for basement tanking when there is a requirement to block water ingress into the building. After preparing the surface the basement tanking slurry is applied to the masonry surface in two to three coats depending on the volume of water ingress. The basement tanking slurry then cures to form a water impermeable surface which should then be covered with a render to protect it. By using this basement tanking method the basement remains completely waterproof and the walls remain dry and breathable.