Insulating membrane for timber, PVC and aluminium windows and doors, made up of high-performance polymeric tape in water vapour-proof fabric (from the inside to the outside), which can be plastered and painted. The UV-resistant surface is coated with a high-quality acrylic adhesive. Applied on the inside of the primary joint between the wall and the sub-frame or window, it follows the movements of the connected parts thanks to its high elongation capacity.