Is my home suitable for IWI?
If your home was built before 1920, it will most likely have solid internal walls with no cavity. The lack of a cavity means more heat can escape from your house through the walls.
Internal wall insulation is applied to the internal face of a property’s external walls and can often be the single biggest home improvement you can make to reduce heat loss. The insulation makes it much more difficult for the heat to pass through your walls, keeping as much of it as possible inside your home for as long as possible.
You should be able to tell which wall type you have by looking at the brickwork on the outside of your house. If your home has solid walls, you will be able to see a pattern showing the long and short side of the bricks like Fig A.
If your home has cavity walls, you will only be able to see the long side of the bricks like Fig B.
IWI is suitable for all properties but is most often installed in homes where External Wall Insulation is not appropriate, such as listed buildings or those located in a conservation area. While IWI may impact internal living space and be more disruptive throughout installation, it is often cheaper, quicker and less complex to install than EWI and won’t require planning permission.