Loft insulation is a quick and straightforward way to insulate and protect your home against heat escaping through the loft in the winter month. Loft insulation is the process of laying down insulation material between the joists of your loft. This prevents heat from escaping during winter, as well as preventing it from penetrating your living spaces in the summer. Due to the relative simplicity of the process, loft insulation is one of the cheaper insulation methods out in the market.