Rising damp is not the most common form of dampness found in buildings, however older buildings tend to be affected by rising damp. The rising damp occurs when the original damp proof course breaks down, allowing moisture to rise through the bricks and mortar. (The technical term for this being called capillarity or wicking.)
The height of moisture rises is heavily dependent upon several factors; the structure of the bricks, the mortar, and the rate of evaporation. Since 1875 it has been a compulsory building regulation for buildings to have an effective damp proof course.
Overtime the damp proof course (D.P.C.) can break down and the resistance to the damp will slowing diminish. Rising damp is easily spotted in buildings, it will generally leave tide marks on walls with salt deposit together with damaged plaster. External rendering and high external ground levels contribute to the bridging of the original D.P.C.
Anglian Preservation will inspect the walls with a portable damp moisture meter, in some cases small core holes are drilled into the plaster and the plaster tested for chloride and nitrate salts. A detailed report, works plan and estimate will be provided. A chemical damp proof course is pumped into pre-drilled holes within the mortar joints, which stops capillary attraction. Re plastering may be necessary to remove the salt contaminated plaster which is hygroscopic leaving the walls to dry over time.
Our qualified surveyor will inspect the property and provide a detailed report, suggested treatment and estimate of costs.
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