Cavity Wall Insulation

Cavity Wall Insulation

The Cavity Wall

If your home was built from 1920 onwards, the chances are that its external walls are made of two layers with a small gap of between 5cm to 10cm that gives you your "cavity"' This means they are cavity walls and you should be able to insulate the space with insulation.

Did you know that around a third of all the heat lost in an un-insulated home is through the walls? Insulating cavity walls reduces heat loss and can save you around £115 a year on your fuel bills.

Cavity wall insulation
How does it work

Cavity wall insulation slows down the rate at which thermal heat escapes, keeping as much of it as possible inside your home for as long as possible. The cavity wall Insulation makes it much more difficult for heat to pass through your walls by filling up the cavity with a material with lots of air pockets in it. These pockets greatly reduce what is known as your walls' U value - which is a measure of how quickly they lose heat - from around 1.5 to 0.5 W/m2K . The lower the U value, the slower heat is lost - and the less energy you need to keep your home warm. You may on occasions also see references to an R-value. This is a measure of thermal resistance and is the inverse of a U-value - the higher a U-value is the lower the R-value is.

Cavity wall insulation defect
Thermal image showing poor fiber type insulation install

Best Cavity Wall Insulation

We would recommend ESP beads ( Polystyrene Bead ) cavity wall insulation as the best product to use to insulate your cavity.

The polystyrene bead used for cavity wall insulation is in the form of virgin pre-formed bead which are usually combined with a binding agent or adhesive at the time of injection. Polystyrene bead are produced to a specified size and density which remains unaltered during the installation process. The materials are produced under strict quality control to ensure compliance with the performance requirement of the appropriate British Board of Agreement Certificate. The installation must be carried out in accordance with the relevant BBA Certificate, their surveillance scheme, the System Suppliers installation Manual and all CIGA guides to best practice. Once installed, the bead filling in the cavity will remain an effective insulant for the life of the building and will require no further maintenance.

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Thermal Imaging is proberly the best way to find where your property is losing heat and energy, a thermal heat loss survey will let you clearly see where the heat is escaping from, having this information will save you lots of money when dealing with the problem and not wasting money on products and services you don't need.

Thermal Imaging