Rising damp is ground moisture containing salts rising up a masonry wall.
Ground moisture will rise up any permeable masonry wall by capillary action. Capillary rise is a natural phenomenon which can only be stopped by the introduction of an impermeable horizontal barrier at the base of the wall. This barrier is commonly called a damp-course.
Rising damp occurs in heritage brick and stone houses which lack an adequate damp-course. Most commonly found in Victorian and Edwardian structures and Californian bungalows. Also in buildings 50 years and over can exhibit rising damp.
Some or all of the below symptoms may be present.
The two most common causes are deterioration of the damp course due to age and burying of the existing damp-course with internal concrete floors or external paths and earth levels.
Yes, because when it comes time to sell, the prospective buyer will order a building inspection which will reveal the problem (with the use of a moisture meter) even if it has been covered up. This discovery results in the loss of the sale or at least a heavily discounted price.
Yes, by installing a new damp-course at the base of the masonry wall. This can be achieved either by using the Tech-Dry DIY Damp Course Installation Systems or by employing a specialist contractor. All damp-course installation work must be followed by necessary replastering.
The Tech-Dry Damp Course is a tough durable polysiloxane barrier that is both alkali and UV stable. A 25 year written guarantee is issued on all new damp courses installed by Tech-Dry.
It is quite simple and easy. A sturdy hammer drill and 10mm drill bit is all that you need. For detailed instructions please download our instruction brochure or contact us.
After damp course treatment, it is imperative that all treated walls be replastered after an adequate drying out period. For detailed information, please download the post installation instructions or contact us.
Mould is a ventilation issue and therefore is not caused by rising damp. Improving ventilation can be achieved by increasing the number of sub-floor vents and the opening of doors and windows, preventing steam from bathrooms and kitchens from escaping into living areas. For more detailed information on the issue and instructions for remedial action please look at the CSIRO reports improving sub-floor ventilation, mould growth in houses, and condensation in houses.