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This could be the cause of a penetrating damp problem.
Penetrating damp is caused by defects within the building or rainwater goods, allowing water to pass through the roof or walls and into the property. A water mark on an internal wall would be a sign of penetrating damp, and will usually indicate the point of the defect, so check externally in the same area as the watermark for any obvious problems.
This could be a sign of condensation.
Condensation occurs when there is excessive water vapour held within the air of the house. When water vapour cools due to contact with cold walls, surface condensation forms, which will make the walls damp and can lead to black spot mould forming which can be hazardous to health, as well as producing an unpleasant dank and musty smell.
The damp proof course (DPC) could be bridged by high external ground levels.
Removing the high ground levels will stop further rising and penetrating damp, but ground salts are hygroscopic and although the wall will no longer be receiving moisture from the high ground, the walls may still be damp due to the moisture received by the salts that still remain in the wall. Advice should be sought from a damp-proofing specialist.
Older properties may not have a damp proof course installed.
If this is the case, we recommend installation of our Newtonite Damp Proofing System, which includes an injectable DPC, Newton 804-DPC, and a number of damp-proofing membranes such as Newton 805 Newlath, which will isolate the wall finishes from moisture still in the wall as the wall dries out post 804-DPC application.
Houses in exposed areas often suffer from penetrating damp problems due to the effects of driving rain.
Newton 807-BKK eco is a clear coating that seals the walls with a vapour permeable treatment, preventing water from entering the walls and so stopping further penetrating damp and allowing the wall to dry out. Repairs to pointing and other defects need to be carried out in addition to this treatment.
Please call Newton on 01732 360 095 or e-mail firstname.lastname@example.org and we will be happy to give you a list of damp proof specialists who cover your area free of charge. Newton’s Registered Installers are trained to offer you the best level of service and expertise, and always offer a reliable solution for your damp problem.
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Our staff are able to provide guidance for projects of all sizes, whether you require some general advice about damp or waterproofing, or support with technical drawings and specifications.