:: ROOF INSULATION FROM INSIDE Aluthermo® is an insulator and a vapour barrier rolled into one: Aluthermo® is efficient and economical. Regardless of the spacing or height of the rafters, Aluthermo® provides an excellent seal.  It is laid continuously directly underneath the rafts. Even in the absence of a roof lining, Aluthermo® is impermeable to moisture from outside. Aluthermo® simplifies the insulation of your roof. You will therefore avoid costly labour, so that you can appreciate your new living space all the more rapidly. Aluthermo®, a healthy insulation system for a healthy home.