An area of the building envelope which is often overlooked when improving the insulation of a building is the floor. Cold floors are not seen as a priority to insulate but adding insulation can help save money in fuel bills, save carbon and create a more comfortable environment. In a domestic dwelling, the ground floor, and any floor that is above an unheated space, such as a garage, would benefit from being insulated. The type of floor, and how it can be insulated depends on several factors and there are a range different floor types, each of which should be insulated in a different way. To help understand some of the different possibilities, we’ve created this guide to some of the key terms used when discussing floor insulation.