When it comes to keeping your house warm one of the most effective methods of energy efficiency is to have cavity wall insulation (CWI) installed into your property. The Energy Saving Trust estimates that 35% of heat loss is through the walls of a property, at IEC we believe the polyurethane foam CWI we install Is the most effective product in reducing this.
We chose to install injected closed cell polyurethane foam because not only does it offer market leading thermal values, but it is also incredibly versatile. It can be used in a number of different property types to achieve a number of different goals in both new build and existing properties.
As well as traditional brick-brick even cavities closed cell polyurethane foam can be used in the following:
- – Random stone cavities – Whereas other forms of blown insulation such as mineral fibre can’t guarantee to fill the cavity. Closed cell polyurethane systems are designed to be injected as a liquid before expanding and curing in the cavity to offer a complete fill.
- – Flood risk areas/ exposure to wind driven rain – because of its closed cell structure polyurethane foam is non-absorbent and as such will not allow the ingress of water through the cavity into your property. Other methods of insulation tend to soak up water not only ruining the thermal qualities of the insulation but also allowing the water to pass through the cavity to the inner leaf.
- – Narrow Cavities – Whilst most insulation products can’t be used in cavities less than 50mm the closed cell polyurethane we use has been tested by the British Research Establishment (BRE) and has been deemed suitable for use in cavities as narrow as 25mm.
- – Properties with failing wall tie – Because of the excellent adhesive qualities of closed cell polyurethane foam once injected into a cavity it will offer excellent structural stability to a property and will nullify the effects of failing wall ties.
The installation Process
The installation method we use is an in-situ application, meaning the closed cell polyurethane foam is injected into the cavity as a liquid which rises and cures inside the cavity to create the foam insulation. This is done by using a 2 part system which runs down two separate lines which meet in the injection gun starting the reaction which leads to the cured foam which will insulate a property.
This install process means that we can install closed cell polyurethane foam into both new build properties once a cavity has been constructed, and also retrofit into existing properties which don’t have CWI as the installation process can be completed from the outside of a property.