Rising Damp Causes and Cure

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( http://horizonpreservationcom.wordpress.com/ ) Rising damp is caused by capillary suction of the fine pores or voids that occur in all masonry materials. The capillaries draw water from the soils beneath a building against the force of gravity, leading to damp zones at the base of walls. In most cases that dampness will have salt associated with it. The salt commonly comes from the soils beneath and is carried up into walls by rising damp. When the dampness evaporates from the walls the salts are left behind, slowly accumulating to the point where there are sufficient to cause damage. Repeated wetting and drying with seasonal changes leads to the cyclic precipitation of salts and the progressive decay of the masonry. Once salt concentrations are high enough to cause damage, repairs will only be successful if they include treatment of both the damp and the salt. Therefore it is necessary to remove the contaminated plaster and re-plaster using a 3:1 sand-cement render incorporating a salt retardant additive.
Treating the rising damp; a damp-proofing cream is injected into holes drilled in the mortar course every 150mm and spreads in the wall before curing to form a damp proof course.

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• damp proofing
• damp walls
• rising damp
• damp house
• dampness

[macplastering]

good job