Thinsulex TLX Silver Foil Loft Insulation is a thin, flexible insulation that may be used on walls and roofs and has a multi-foil surface. It may be put beneath or above rafters, depending on your preference, and it can be utilised in new or renovated roof rafters. Glass wool is used in this product to reduce the thickness of insulation required and the time required to install it. It has an airtight vapour barrier that prevents air leakage, as well as multi-foil insulation layers that keep air out. This product has no potential to cause global warming or ozone depletion. This product is BBA Approved†