WATERPROOF REPAIR METHOD OF BUILDING ROOF FLOOR

PROBLEM TO BE SOLVED: To facilitate execution and improve durability, the shading and heat shielding of a building after execution without penetration of water by making a fluorocarbon resin film an upper side and sticking a waterproof film laminating a fluorocarbon resin film, a aluminum foil, a reinforced film and an adhesive layer on a building roof floor. SOLUTION: A waterproof sheet 1 is composed by laminating a fluorocarbon resin film 2 such as polyvinyl fluoride, an aluminum foil 3, a reinforced film 4 such as a polyethylene film, an adhesive layer 5 such as non-vulcanizing butyl rubber-based adhesive and a mold releasing agent 6. The whole thickness of the waterproof sheet 1 is made 1.0 mm or thicker except for the mold releasing agent. For example, urethane-based primer is applied on the surface of a building roof floor repairing a crack and a lost part by a sealing material or the like, and after drying the waterproof sheet 1 is stuck by making the fluorocarbon resin film 2 an upper side. Next, a joint tape laminating the fluorocarbon resin film, the aluminum foil, the reinforced film and the adhesive layer is stuck on the end of the sheet 1 to be covered.