The Dangers of Unofficial Cavity Wall Insulation
When installed correctly cavity wall insulation is designed to lower emissions in the home and assist in keeping properties warm; by filling the gap between the external and interior wall preventing heat from escaping. When installed incorrectly however the damage to your property can be limitless especially when left over time. As damp sets in to your property, rotting timbers and breaking wall ties what may have been a small amount of damage can become a real danger.
Damp Interior Walls
The gap between the exterior and interior walls of a property (the cavity) is used to prevent water from seeping through to the interior wall causing damp inside a property. Cavity wall insulation fills the gap which potentially creates a channel for water to pass across the cavity on to the interior wall and into the property. If you have a property which is prone to damp or in an area with high winds and strong rains such as coastal regions it may not be advised for you to have insulation installed, as the chances of damp rise significantly.
A Pre- installation survey should have been completed before any works took place to see if your property is suitable for insulation.
Strong timbers are vital to the structure, stability and overall safety of your property. If CWI is installed incorrectly it can lead to the timbers becoming damp and consequently weakening.
To stay strong timbers must remain dry; once they become wet mould and fungus has a chance to grow deteriorating the stability of the structure and increasing the chance of spores spreading to other areas of the property.
Blocked Air Vents
It is important to keep any timbers and woodwork dry. In every property you will find air vents to keep a passable air flow through the house; keeping the property dry and preventing mould and fungus from growing. If CWI has been installed incorrectly then some of these vents may have been sealed, this can damage the floorboards over time making them unsafe. If you feel the air vents to your property have been blocked then you should contact someone straight away; you may not notice the damage immediately, however the dangers that it will cause will only worsen over time.
Your Pre-installation survey should have covered the quality of your exterior brick work, pointing and the type of paint you have on your property, (such as a moisture prevention paint) before any installation took place. If there is any reason to think that the condition of the brickwork or the paint it is covered in will prevent water from leaving through the exterior wall then no installation should take place. Moisture must still be able to leave the property through the outside wall to prevent damp to the interior, furthermore any moisture that may get trapped in the outside bricks could also cause damage by freezing and consequently cracking the brick work.