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Diagnosing the causes of dampness (GR 5 revised)

Diagnosing the causes of dampness (GR 5 revised)

by John Houston (18-Mar-2015)


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Book Description

Dampness of one sort or another is the most common problem in housing. It results in visible wetting of walls, ceilings and floors, blistering paint, bulging plaster, sulfate attack on brickwork and mould on surfaces and fabrics, usually accompanied by a musty smell. It can also lead to less obvious problems, eg thermal insulation is reduced in effectiveness or brickwork cracks because metal components embedded in it have corroded. As with all repair work, the first step to solving any damp-related problem is to diagnose the cause correctly. This Good Repair Guide provides advice on how to identify the potential cause of dampness in homes. It is aimed at housing professionals, home owners and occupiers, and replaces the guidance published in 1997. The other guides in the series, Good Repair Guides 6–8, cover specific remedial treatment for the principal causes of dampness.


Internal dampness: moisture from condensation
External dampness: rain penetration
-Causes of rain penetrating solid walls
-Causes of rain penetrating roofs
External dampness: rising damp
-Causes of rising damp
Construction moisture
Leaking pipes
Leaking roofs
Ground and surface water
Contaminating salts
Hidden dampness
Specialist inspection

A4, 4pp

3 photos

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