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Penetrating damp is most commonly caused by one of two scenarios:
Darker patches may appear on the outside of the wall. Internally, damp patches will show at the same point. If you live in an exposed location, the damp patches will usually be worse during bad weather or in the winter.
When there are building defects or poorly maintained rainwater goods, external darker patches are usually visible on the wall. Small plants will often take root where defects have allowed debris to accumulate.
Penetrating damp is far more common in older properties with solid walls. A new-build property with cavity walls offers more protection. New-builds are unlikely to suffer from this type of defect unless there is some form of bridging of the cavity.
When the cause of penetrating damp has been rectified, the internal walls will take some time dry out, typically at a rate of 1mm per day. With large, solid walls, this can mean that the walls are still damp for a year or more, damaging new internal finishes.
Installation of a Newton System 800 Damp Proof wall membrane will allow for internal finishes to be completed whilst the walls are drying out.
Newton damp proof membranes can be installed by a builder or DIY. Our damp proofing packs and other damp proofing products such Newton 806-CWC thermal paint and Newton 807-BKK eco external water repellent can be purchased here and ordered on next day delivery. Visit our Damp Proofing Shop
Alternatively we could send you a list of Newton Specialist Basement and Damp Proofing contractors in your area.
Please note that if your damp problems are below ground within cellars or basements, or there are earth retaining walls, a basement waterproofing solution would be required. Read More: Basement Waterproofing.
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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.