IMPERDAN FP 40 P is a waterproofing bituminous sheet with non self-protected surface of 4.0 kg/m², LBM-40-FP (APP -5 ºC). Composed of a non-woven polyester felt reinforcement and covered on both sides with polymer modified bitumen (pliability -5ºC) mastic. A polyethylene film is used as anti-adherent material on both sides. Tested according to standard EN test methods.