Bitumen Coating Sheet: Bitumen sheets are mainly used for waterproofing. And it can use for both residential and commercial buildings. It protects the roof deck from the rain before the roofing is put in. It provides an additional weather barrier just in case of blow offs or water penetration through the roofing or flashing. It protects the roofing from any resins that bleed out of the overlay. It helps forestall unevenness within the roof overlay from telegraphing through the shingles.