What different types of insulation are there?There are three popular types of insulation
Batts or segments - This is the traditional type of insulation that features in most older homes. Made from fibreglass or mineral wool, they come in rolls or pre-cut sizes. They are quick and easy to install, especially during a new build when the framing is up and before the linings are put on. But they are harder to retrofit because the wall linings need to be removed. Batts insulation generally has lower R-values than other forms of insulation. It can also be harder to get a precise fit, especially around pipework and light fittings, leaving gaps for draughts.
Spray foam insulation - This was widely used in the 80s and 90s. It. is made of polyurethane foam which is sprayed into a cavity and expands to fill cracks and voids. It is good because it fills gaps tightly creating a well-sealed thermal envelope. But it is tricky to install and means you need to remove all internal wall linings. It can also damage your home's framing if not installed correctly. the foam can also contain chemicals which can cause or exacerbate respiratory issues. Most installers no longer use spray foam.
Blown loose-fill insulation Blown loose-fill insulation is a better alternative to spray foam. Blow in insulation is a dry-fibre product which is blown into cavities and then fills the gaps and voids. It creates tight seals and fills spaces completely creating good thermal resistance. Because of the way the product is made, there is no need to remove wall linings. Blow insulation can be blown in through small holes, either through internal walls or via external walls and cladding. The product does not contain any harmful chemicals. Insultech Insulation recommends blow in insulation for walls and ceilings.