Yapı ve İnşaat / Çin Alım Satım İş Birliği Nakliye İhale İlanları Çin için İhracatı İlanları, Çin İthalat ve İhracat

KRS asphalt shingles are the most common roofing materials for steep roofs used today. They are made into many layers. The top layer consists of granules imbedded in asphalt and a seal-down strip. In the core of a shingle there is a fiberglass mat. The longevity of a shingle depends on the quality of the asphalt, the amount of asphalt used, and the quality of the fiberglass mat.