Cavity walls are designed so that the two leaves of the wall allow water to seep into the cavity and leave the inner home completely dry, especially in windswept, high rain exposure areas. If insulation is incorrectly installed, then the foam used to fill the cavity can hold onto moisture. Voids in the foam can also direct water towards the inner leaf of the wall and this can exacerbate any existing problems, as well as potentially causing them.
Cavity wall insulation damp can cause a variety of problems with your home, including mildew, mould and bacteria growing on the walls of your home. This can lead to breathing problems as mould, especially black mould, release dangerous spores into the air in your home. Mould should be removed as quickly as possible through ventilation and cleaning, as it can lead to other serious diseases and feeling sick all the time.
Cavity wall insulation damp can also be caused by rats and mice getting into the insulation fill and making nests out of it. From this, gaps are created so when it is raining, rainwater can penetrate through the outer leaf of the wall and into the inner leaf. Another cause of damp problems is that insulation cannot cover wall ties, and so this leads to a guaranteed gap that water can seep through. Steel ties can also channel water themselves, especially if they have mortar droppings on them.
One way to fix damp caused by cavity wall insulation is to have it removed. You should be protected by the CIGA (Cavity Insulation Guarantee Agency) guarantee, which lasts 25 years. With this, you should be able to contest the installation, receive compensation and have the insulation removed.
Damp can also be prevented by sealing the outer brickwork, so water cannot penetrate in the first place and any existing moisture can seep out of the brickwork. This, alongside proper pointing of masonry, will reduce the majority of water penetrating the outer leaf and reduce the stress and water retention of the insulation. Has your property been damaged by damp due to cavity wall insulation?
If cavity wall insulation damp has already occurred, outer leaf sealing can be an inexpensive alternative to removing the insulation itself. This can also reduce your energy bills by sealing in heat as well. This can also be used while the insulation is being installed to prevent problems before they occur.
Did you know you could be entitled to compensation if your property is suffering from damp as a result of poorly installed cavity wall insulation? www.mycavityclaim.com to find out more.