Dampness in homes

Damp is one of the most common problems experienced by home owners. Damp can spread, damaging domestic fittings, decorations, furnishings and encourages mould growth.

Mould and damp go hand in hand. If you have mould there is damp and where there is damp you will find mould. Mould grows in dimly lit areas found in places like attics, basements, bathrooms and on window sills.

Mould spores are light and easily becomes airborne. They can threaten your health by stimulating the spread of fungus and decay in the structure of your home.

Before you can cure a damp problem you must first find the source. Longuard Damp Proofing surveyors are experienced in identifying the sources of all dampness in homes and recommending the most cost effective method to cure your damp problems.

Hygroscopic Damp - Salt Damp

Ground water is often contaminated with Chloride and Nitrate salt. As water rises up the wall and subsequently evaporates away, these salts are deposited in the masonry.

Chloride and Nitrates salts are Hygroscopic, they readily absorb moisture directly from the air causing a damp stain. The distinct wetness that can be seen on a wall affected by rising damp typically results from a high concentration of Hygroscopic salt.

Hygroscopic salts are not just associated with rising damp or ground water. High levels of these salts can be found on chimney breasts and fire places.

Penetrating Damp

Penetrating damp is caused by water leaking through walls, usually caused by structural problems in a building such as faulty guttering or roofing. Penetrating damp often shows up through damp patches on walls, ceilings or floors which may darken when it rains. You're more likely to get penetrating damp in an older building. Learn more about penetrating damp.


Condensation is the most common form of damp and is caused by moist air. It's mainly a winter problem as at this time of year, walls are much colder than the air. There are noticable water droplets on windows or walls, unpleasant smells and dark moulds. Our solutions range from advice on lowering humidity levels in the home through to a range of ventilation products. Learn more about condensation control.

Rising Damp

Rising damp is caused by ground water moving through a wall. Most walls allow some water in, it's usually stopped from causing any damage by a barrier called a "damp proof course". If this is missing or ineffectual, you may suffer rising damp. Learn more about rising damp.