What is the Difference Between Rising Damp and Penetrating Damp?

This is a question that many of our customers ask and in this short article, we explain how rising and penetrating damp differ, along with typical solutions.

Rising Damp

As the name implies, we are talking about moisture that rises up from the ground when we mention the term ‘rising damp’. Buildings need a damp proof course to prevent moisture from attacking the structure; damp passes through most materials with capillary action, much like a sponge soaks up water and if not addressed, the moisture will continue to spread. Older London homes typically have a black layer of DPC that is bitumen-based and impervious to water, which can easily be damaged by ground subsidence. Our independent damp survey includes a thorough inspection of the DPC and we look for tell-tale signs such as damp patches on internal walls and moss growth outside.

Solutions

Often, the best solution is to inject a chemical foam into the wall cavities, which acts as a moisture barrier and also provides excellent thermal insulation, which reduces or removes condensation. The original DPC can be repaired in some cases; we work closely with the best damp-proofing company in London and they guarantee their work for a full 30 years. 

Penetrating Damp

Moisture that enters a building from the roof or external walls is called penetrating damp, because it eventually penetrates into the interior, damaging timber and plaster. The mastic that seals timber window and door frames can be compromised and this would allow rainwater to penetrate the frame and cavity wall. The passing of time sees the damage slowly spread and if a house is unoccupied and there is a damp issue, the results can be devastating. Condensation is a tell-tale sign of penetrating damp and our condensation experts can come up with a solution.

Solutions

The most important thing to do is find the source of the moisture and fix it; only then can you think about damp damage repair. We offer an independent damp survey that covers every aspect of damp, mould and timber rot; we use cutting-edge digital devices to pinpoint damp and you receive a detailed report in your inbox the following day. While we do not provide damp-proofing services, we work closely with the best damp-proofing company in London; they issue a 30-year warranty on all damp-proofing work.

The Importance of Regular Damp Inspections

The only way to be sure that your London home is free from damp and mould is to book an independent damp survey from a reputable company such as London Damp Specialists. You can call us on 020 7205 4886 or leave a message in the online form and we will get back to you.

Pre-Purchase Damp Survey

It is not difficult to conceal damp damage; a coat of paint here and a skim of plaster there and the average person would be none the wiser. Be sure that the property is free from damp and mould by booking an independent damp survey with a company that has been providing a top-rated service for more than 40 years.