Wonderbuilds 3B Bonding Felt is designed for installation as the bottom layer of roof cladding, for waterproofing engineering structures and for vapor sealing. Can be used as underlayer for bitumen shingles or other types of roofing materials for pitched roofs. Not recommended to use as one-layer roofing cladding or one-layer waterproofing. Manufactured according to EN 13707:2004 A2:2009.
