Why properly insulate your cavity walls?

Did you know that around a third of all the heat lost in an un-insulated home is through the walls? Cavity wall insulation is an effective way to save energy and money at home. A well insulated house keeps warmth exactly where you need it – indoors.
So, insulating your cavity walls will help you to heat your home more efficiently. Using less energy reduces carbon dioxide emissions (CO2): one of the biggest causes of climate change. You will also save money on your bills too.
Cavity wall insulation can also help to reduce
Cavity wall properly insulated are so cost effective that it will pay for itself over and over again. The better insulated your home, the less energy you need to keep it warm – and the more money you’ll save.
By insulating your cavity walls you could cut your heating costs and, by saving energy, your household will produce less CO2. So, insulating your cavity walls is a great way to help fight climate change.
How does cavity wall insulation work?

Heat will always flow from a warm area to a cold one. In winter, the colder it is outside, the faster heat from your home will escape into the surrounding air.
Cavity wall insulation slows down the rate at which it escapes, keeping as much of it as possible inside your home for as long as possible. How? 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

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