Technical drawings

Polyethylene Cavity Drain Membranes are the ultimate solution to basement waterproofing. In an ideal situation, water pressure should be removed from the building by lowering the ground levels and diverting water away from the property.

As we all know, an ideal situation rarely occurs in the real world. Normally it is impossible to achieve the above due to a basement's very nature of being a subterranean room.

Cavity membranes create an envelope within the building on the negative side of water pressure allowing the natural drainage of ground water to enter the structure and be collected behind the system to be efficiently dealt with by providing a pre-designed drainage facility behind the finished surfaces.

Traditionally structural waterproofing systems require the removal of plaster and render to prepare the wall surface for the application of the treatment. This type of waterproofing relies totally on an adequate bond between the treatment material
and the wall surface. This is destructive and causes distress, mess and damage to the building. In many cases, Cavity Drain Membranes can be fixed directly on to existing surfaces using the special water sealed fixing plugs saving time, mess and money.

Traditional cement based systems are not vapour barriers and condensation problems can often be created by using these dense render type materials.

Cavity Drain Membranes are not only water impervious linings, they also provide an efficient vapour barrier, combined with added insulation qualities, this makes severe condensation unlikely.

Pressure created by water retaining systems such as cement based tanking inflicts stresses on a structure, which can cause additional problems. These types of waterproofing systems will only have a limited life and can affect other rooms or adjoining property. Cavity Drain Membranes are unaffected by being in continual contact with wet surfaces. They are also complete barriers
against salt contamination.

Aggressive Sulphate, Nitrate, and Chloride salts are completely isolated from the internal finish surfaces.

Internal finishes to walls and floors can have added insulation performance. Correctly installed and with maintained drainage the Cavity Drain System should last for the life of the structure.