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Cavity wall insulation

Climate change is a major threat to humanity, fuel bills continue to rise and our reliance on imported energy continues to grow.

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Cavity wall insulation

Cavity wall insulation is used to reduce heat loss through a cavity wall by filling the air space with material that inhibits heat transfer. This immobilises the air within the cavity, preventing convection, and can substantially reduce space heating costs. Cavity wall insulation also helps to prevent convection and can keep a house warm by making sure that less heat is lost through walls; this can also thus be a more cost-efficient way of heating one's house.

A cavity wall is made up of two masonry brick walls running parallel to one another with a space (cavity) between them of at least 50mm. Masonry bricks are very absorbent, so moisture absorbed by the outer wall typically drains through the cavity, rather than coming into the home, helping to prevent damp issues. This type of wall construction became the norm in the 1930s superseding solid walls and as time has gone on, the size of the cavity between the two skins of brick has continued to grow – a typical cavity wall now is between 280-300mm thick.

Although some builders began insulating cavity walls in the late 1970s, it only became compulsory under building regulations to do so during the 90s. As such there are many properties in the UK that currently have unfilled cavity walls. The good news it that these can be insulated very easily!

Once we confirmed if your home is suitable, our team will drill small holes about the size of a pound coin into the outside of the property.

We ‘ll then use specialist equipment to blow insulating material – usually made from made from a high fraction, recycled granulated mineral wool fibre or polystyrene beads – into the cavity.The insulating material creates a “quilt” affect in the cavity around your home, meaning much less heat is able to escape and you won’t have to use as much energy to keep your home warm inside.

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