Monday, 17 January 2011

Damp Proof Course Specifications

Establish a drill course both horizontal and vertical as required to avoid any bypass of moisture from common party walls.


The levels of the damp will take into account any conventional damp course and internal floor levels.

Injector nozzles will be inserted into the drilled holes and the process of injection using D.P.C chemical damp course fluid injected under pressure reaching a point of refusal by emission of the fluid from the wall.

The process of injection is usually complete 8-10 seconds depending on the ability of the particular wall to absorb the fluid.

After treatment the nozzles will be removed from the drilled course and all drilled holes sealed effectively with a sand/cement render plug.

Wherever possible all treatment will be executed from the external elevations of the property. Where internal treatment is necessary the client must provide unrestricted access to the walls to be treated including the removal of radiators, baths,  toilets and kitchen units where appropriate.

Rising dampness will be stopped by the installation of a new chemical damp proof course.

After the installation of the new damp proof course the walls must be allowed to dry out naturally by the course of evaporation. This is always necessary and the rate of evaporation is dependent on many factors including the level of moisture retained in the wall, the porosity of the wall and its various coverings and decorations and the heating and humidity of the surrounding environment.

A wall will never properly dry out even after treatment if there are other sources of moisture ingression. These can take many forms such as cracked or defective brickwork, rendering, sills and plinths. High outside ground levels can result in the damp proof course being "bridged". Wall plaster abutting a solid floor can absorb surface moisture from the floor. Defective rainwater goods can also be the source of water penetration.

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