Condensation in dwelling houses is mainly a winter problem particularly where warm moist air is generated in living areas and then penetrated to colder parts of the building.
Water vapour is produced in relatively large quantities from a number of activities. It can also rise from damp ground under buildings and in some cases penetrate timber floors and pass freely up the cavities of brick walls into roof space. The severity and effects of condensation will then depend on the type and nature of building construction and the extent of the vapour barriers created in each design.
The traditional design of roofs has induced the occurrence of condensation, especially in the winter. In a flat or decked roof construction the waterproof roof membrane is also a vapour barrier. The water vapour is then prevented from permeating to the external environment. Condensation is then induced to occur within the roof deck or condense under the roof sheeting and drip from it.
Condensation will also occur in low pitched roof constructions particularly when the ceiling follows the slope of the roof. The wetting of ceilings with condensation will also occur when the cold air through either convection process or percolating from the external atmosphere lowers the temperature of ceilings and condenses water vapour from the underlying rooms. The effects are made apparent when little or no provision is made for ventilation of the roof space.
Condensation will often occur in brick cavity walls where moist air in the construction and external cold air circulate in a confined space. The temperature of the moist air is lowered, reaching the dew point and moisture is deposited on the coldest nearby surface, in some cases causing water to drip from the surfaces.
Condensation will also occur under suspended floors where the temperature of humid air in the floor space is lowered by cold air moving in through ventilators and water is then condensed on the underside of floor. This will often induce timber decay of the wooden floor.
Primary Measures Advised By Our Condensation Experts in London
1. Improve Ventilation
Where the condensation is a widespread problem, a more successful approach would be the installation of a positive pressure system. This will draw air in to the roof space, gently push it down in to the property, and cause moisture laden air to be continually pushed out.
2. Apply Heat
A constant low level background heat will gradually warm wall surfaces and reduce the risk of condensation.
Secondary Measures Advised By Our Condensation Experts in London
A strategically placed dehumidifier, to lower the water content of the air, can be very effective.
2. Surface cleansers and anti-mould paints
Surface cleansers or anti-mould washes are an effective short term measure to remove Black Mould from walls and other surfaces.
Anti-mould paints are particularly useful in kitchens and bathrooms or other areas where condensation is often difficult to control and where there is a high risk of mould growth. They must not be decorated over and will remain effective for many years.
For condensation control in London contact condensation experts in London - Damp Proofing London South on 020 7498 2837 or 07912 306337 or fill in our call back form.
Our condensation experts in London South West / South East cover such areasas Battersea, Clapham, Fulham, Putney, Kensington & Chelsea, Balham, Wandsworth, Lambeth, Barnes, Stockwell, New Malden, Wimbledon, Brixton, Streatham, Colliers Wood, Herne Hill, Dulwich, Tooting, Chiswick, Forest Hill, Beckenham, Sydenham, Croydon, Kingston, Sutton, Teddington, Penge, etc.