Rising / Penetrating Dampness And Condensation
It’s important to diagnose the relevant type of dampness from the start. Our surveyors have many years experience in dealing with the three types of dampness which are rising, penetrating and condensation. For the treatment of rising damp we specialise in the use of cavity drain membranes in conjunction with the installation of a silicone gel damp proof course and attendant replastering, as they form a physical barrier between the wall and the internal finish thus solving the problem indefinitely.
Water rises from the ground through the foundations and up into the walls by capillary action, carrying with it salts, which in time become more and more concentrated and leach through plasterwork leading to spoiling of decoration and weakening of plaster. These effects are caused by the lack of, or failure of, an existing damp-proof course, which can be remedied by the installation of new chemical damp-proof course.
The company uses only the safest, low toxicity environmental friendly chemicals available. Installation is carried out to British Standard BS6576 observing the codes of practice laid down by the British Standards Institute and the British Chemical Dampcourse Association.
Salts are hygroscopic in nature (moisture attracting), and will absorb water from any available source, having cut off their main source by introducing a damp proof course, those still stored within the brick or stone work and its internal finish can still interact with the air inside the building which will always contain some moisture. To this end, it is essential that all contaminated plaster be removed and a barrier between the interior of the room and those salts still present in the masonry, this being in the form of sand and cement render with included waterproof and salt retardants agents or the application of studded tanking membrane system and a final finish coat of plaster.
Penetrating damp issues can normally be solved easily by finding the cause, and rectifying the problem (usually something simple like a missing shoe from a down comer pipe) and then letting the affected area dry out naturally, with only localised re-plastering required. Where moisture ingress is occurring due to porus brick / stonework we also carry out external repellent treatment using the market leading storm seal which has a unique thixotropic consistency which allows the structure to breathe and has up to 10x the life of normal spray applied surface products.
Condensation results from the fact that air can hold more water vapour when warm than it can when cold. When warm air is chilled it deposit’s the water it can no longer retain as condensation. This is an effect that can be demonstrated by breathing on to a mirror or other cool surface.
In it’s less serious form condensation may steam up windows and mirrors. In more severe cases it can cause dampness on wall surfaces and in furnishings. Underlying brickwork or masonry will normally be of lower moisture content. It may cause mildew on fabrics and leather and in extreme cases can result in walls to become visibly wet, it is frequently accompanied by mould growth of which the most common is black spot mould which appears at first like small soot like spots which can join up and form large black areas of toxic mould which is harmful to health.
The cure for condensation is regular levels of heat and ventilation and we offer free advice and literature on how you can do this. We also have a range of products to combat this problem.