Treating Dampness

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Treatment of Penetrating Dampness Above Ground

The first stage is to make sure that there are no defects in rainwater goods, pointing of brickwork or around windows and doors. Once these faults have been corrected then the wall can be sprayed with a water repellent. In many cases it is better to use a water- based product such as Envirosafe Façade Water Repellent as this can be applied even if the wall is a little damp. Solvent-based systems need to be applied to dry walls otherwise they will not soak in successfully.

Treatment of Penetrating Dampness Below Ground

There are two basic methods of treating walls below ground. One involves putting in a vertical barrier against the water. The other is a passive system that creates a gap between the wall and the finished surface, which allows the water to evaporate or in severe cases to be directed to a sump. This is controlling the ingress of moisture rather than stopping it. It relies on a pump to remove the water away from the cellar.

Creating a barrier using Cementitious Tanking Systems is commonly used in this situation. Walls are prepared by removing all loose material to create a sound surface after which Tanking Slurry is applied to create the barrier. Tanking Slurry becomes an integral part of the substrate and stops water entering the cellar.

Treatment of Rising Dampness

To stop rising dampness requires the insertion of a damp proof course. Injecting the brick/stone/mortar joints with a water repellent material does this. In the past this required the use of a pump and solvent based products. Today however water based creams are available which are injected into pre-drilled holes using a mastic gun, caulking gun or a standalone injection pump. These products are then absorbed into the wall and cure to form the damp proof course. Envirosafe One Shot Injection Cream is used in this system although we can also supply the liquids if required.

Treatment of Condensation

The best method for treating condensation is to identify the source of the moisture and treat. This will involve installing a system to change the air continually or at times when water is being produced e.g. cooking, washing, bathing etc. With the Kair Heat Recovery Ventilation Systems, air is continually exchanged with air from outside. This is done through a heat exchanger, which recovers up to 65% of the heat from the room. Ordinary extractor fans can also be used preferably linked to a humidistat. These will not however recover heat.

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