Dampness in basements or on plaster work at both high and low levels whether due to high adjacent ground levels, or defective external rendering is a very common problem in older buildings. Where possible all external defects which contribute to dampness in masonry should be rectified. However in many cases residual dampness will still continue to cause problems on plaster surfaces even after the repair works have been carried out. Their are two different types of waterproofing systems, both of which are designed to prevent dampness or water being transferred onto the finished decorations. They are the Membrane System and Cementitious Tanking.
The Membrane System is a highly effective way of isolating damp walls from finished decoration. They are a varied range of membranes which provide damp and waterproofing solutions adaptable to many types of application. The membrane is fixed using long tapered P.V.C plugs which go through plaster work into the masonry. The fitting of double sided tape at all joins insures a continuous damp proof surface.
Cementitious Tanking is a traditional way of waterproofing. It works by applying a tanking slurry (in 2 to 3 coats) to hold back damp or water often found in older properties. It is used in situations where external levels are higher than the internal floor level, causing water to penetrate through the wall. The barrier is usually continued onto the floor surface to provide a waterproof seal.