Damp And Its Effects

Without doubt one of the most frequent problems encountered by home and building owners is damp and damp proofing

. The most common source of moisture in the base of the walls of buildings is from defective ground and surface drainage. This is present to some degree in almost every building in the country, due to a combination of such factors as rising ground levels, the failure of ground drainage systems, and the increased use of concrete finishes around buildings without proper consideration of drainage slopes.

Damp conditions at the foot of walls may be greatly increased by condensation. This occurs when warm moisture-laden air cools to due point (the temperature at which moisture condenses) against a cold surface. Such cold surfaces commonly occur when the insulation value of the external wall is reduced by water penetration, as described above. Intermittent occupancy with intermittent heating provides the conditions for condensation of further water on these cold damp surfaces, particularly in ground floor bedrooms. These phenomena are the main causes of damp in the base of walls rather than 'rising damp' alone.

The effects of damp also make the property cold and unappealing. Damp can also prove a breeding ground for mites and mould aggravating respiratory problems such as asthma.

Damp and its effects can be controlled by adopting one or more of the following measures:

The provision of suitable moisture sinks to dissipate the moisture at its source without causing problems to the structure or occupants, and the repair of any contributing defects acting as moisture sources, such as broken pipes.

The introduction of either physical barriers using damp-proof membranes or materials to form a 'damp-proof course' or hydrophobic (water-repellent) materials as in 'chemical damp proof courses'.

The isolation of vulnerable materials such as timber and interior finishes from damp fabric.

If you are facing damp problem at your home, you can request a survey from TapcoHomedry.co.uk . They have been established since 1971 and are London, Surrey and the Home Counties premier damp proofing, water damage, fire and flood restoration company.

by: Jim Strange

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