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Hydroscopic salts are a sympton of rising damp and have the ability to trap moisture and will also be present following damp proofing treatment, eg the new damp proof course which has been installed. These salts will remain unless they are also treated as a separate problem. They are often the result of rising damp and on completion of damp proofing treatments in the property, the moisture which is already above the level of the new damp proof course will in time evaporate, but whilst this process occurs, salts in the fabric of the structure will be carried to the surface of teh wall at times of high humidity. There are various chemical types of salt which come from different sources such as unwashed building sand, contaminated masonry and substrate from agricultural buildings that have been converted into living accommodation.There are also salts within the ground.
Whilst it is not justifiable to replaster in every situation, the existing plaster needs to have the ability to control the effects of residual moisture and the passage of migrating salts following damp proofing treatments. Our Surveyors will only recommend the need to replaster where it is necessary to do so.
McCoy Hill offer a varied range of plastering solutions following damp proofing treatments. Subject to the site conditions and the clients requirements, most commonly used are: