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Damp Proofing

Chemical Injection Damp Proof Courses

Typically a chemical injection damp proof course is created by drilling holes at about 100mm centres in the brickwork or mortar joints at ground level. A damp proof course fluid is then pumped into these holes under pressure. The fluid reacts with carbon dioxide to form a water repellent silicone based resin within the capillaries of the bricks or mortar. This resin stops the further passage of water but is permeable to water vapour thereby allowing the materials to breathe and dry out.

Many companies also offer an 'organic' based injection method whereby the damp proof course fluid reacts with the water present in the brickwork to form the impermeable barrier.

With most chemical damp proof course systems it is vital to remove the lower 1m of plaster from the internal wall since this is usually contaminated with hygroscopic salts. The walls are then re-plastered with a suitable 'renovating plaster'. The renovating plaster is typically a cemetitious, lightweight plaster containing lime which acts to inhibit mould formation. If renovating plaster is not used a 1:3 sand cement render can be used but the sand must be sharp sand to BS1199 and a salt retardant additive is required. A layer of thistle board finishing plaster or a multi finish is then applied. Carlite finish is not suitable.

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19 January 2020
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