The external wall of your house is constructed of two separate masonry walls with a cavity or space of at least 50mm. This is known as a wall cavity. This wall cavity is important as it ensures that the inner wall stays dry and that no moisture penetrates the inside of the building. This is also the space where our installers will drill holes and fill  with a spray or foam insulation, cutting your energy costs.
Our expert insulation installers will be happy to show you the wall cavity when they visit your home to offer you their free estimate.