A: Currently, the most commonly used waterproof felt on the market is the traditional five-layer oil felt. Although it is still used in rural areas, the vast majority of new and old construction sites have switched to the five-layer or seven-layer oil-resistant felt specified in CNS 10416 (that is, replacing ordinary core-paper oil felt with a felt that has a non-woven fabric or fiberglass mesh sandwiched in between, and replacing the base asphalt with synthetic asphalt, thereby significantly improving the quality). The most common types available in the market include:
- Baked modified asphalt waterproof felt… YesAPP、SBS、APP與SBSMix three kinds.
- Self-adhesive sheet-shaped modified asphalt waterproofing felt is easy to install, does not involve thermal work, and is environmentally friendly and safe; however, it is important to choose a reputable brand; the quality imported from advanced countries will generally be far superior to that of other countries or domestic products.