Excuse me, what is the best material for waterproofing the roof of second-hand houses? I heard that there are waterproofing materials and silicone waterproofing materials. Which brand is good?

1, PE film SBS modified asphalt waterproofing membrane for the owner's roof, 4mm, minus 20 degrees, one layer, or 3mm self-adhesive waterproofing membrane.

2. SBS modified asphalt waterproofing membrane with shale surface, 4mm, minus 20 degrees, one layer, or 3mm layer self-adhesive waterproofing membrane is not used for roofing.

Note: At present, the quality of materials in waterproof industry is quite different, so it is suggested to choose brand materials: Liaoning Daewoo, Zhuobao, Keshun, Yuhong, etc.