This guide will display how to install our EcoAirtec Double Insulation EcoAirtec Double is a 4mm bubble membrane with a true aluminium foil either side. It works by reflecting unwanted heat away, aswell as reflecting and retaining heat. This results in the product creating a more ambient temperature all year round. Our material is extremely versatile and can be used in Roofs, Walls, Floors, Sheds, Garden Buildings and many more applications! EcoAirtec Double is available to purchase in 4 sizes from Multifoil-Insulation at the lowest trade prices!