After SBS waterproof construction, there are water marks on the board in the hot weather the day after tomorrow.

It is because the effect and quality of waterproof products are not very good, and waterproof construction is not in place. Yuhong elastomer modified asphalt waterproofing membrane is made of styrene butadiene styrene thermoplastic elastomer modified asphalt as impregnation and coating material, polyester felt, glass fiber felt and glass fiber reinforced polyester felt as tire base, and the upper surface is covered with thermal insulation materials such as polyethylene film, fine sand or mineral flakes.