Rising Damp and Treatment
Rising damp is the upward movement of moisture through walls and sometimes floors by capillary action from below the ground. It can rise to a usual maximum height of 900mm in the walls depending on the masonry types and outside ground levels. Salt deposits generally form a horizontal tide mark, below which there will be discolouration, peeling wallpaper and possibly white efflorescent salts which have been drawn out of the brickwork by the water. All buildings are surrounded by natural moisture that is trying to get into the dry structure of the building.
Floors can display moist patches and staining, materials such as stone and brick are naturally porous and will soak up moisture like a sponge without the aid of a damp proof membrane or rising damp treatment. When a building is constructed, a rising damp treatment is generally installed in the form of a damp proof course in the walls to prevent rising damp appearing, however, when this treatment does not exist or becomes damaged the most common result is rising damp.
The result of this is damage to interior plaster and wall coverings. It should be noted that recent a finding by the Asthma Foundation concluded that damp in rooms could increase the risk of developing asthma.
If left untreated it will rot any floor joists and other interior timber that come into contact with it, as well as causing more damage to the interior of the property.
A new DPC (damp proof course) will need to be installed. This is achieved by removing all internal plaster and backing coats back to the brickwork at a minimum of 1,000mm, depending on exterior ground levels, to stop any chance of bridging the affected areas.
Drilling holes into the base of the wall at 120mm intervals and injecting Triton Chemicals new generation DPC formula. This is a water based Thixtropic gel, which diffuses naturally into the substrates. After injection, Tri- Gel reacts to form a water-repellent silicon resin network within the capillaries of the substrate. This network is permeable to water vapour which means that the walls can breathe and dry out naturally. This formulation is not reliant on alkalinity for effective curing. Tri-Gel can be used to treat brick, stone and other substrates.
Once the affected area has been injected a 3-1 sand and cement waterproof render is applied to prepared brickwork followed by multi finish plaster once the render coat has been allowed to dry out.
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Unit 142 Culvert Court, Culvert Road, London, SW11 5AU