What is the difference between a fiberglass laminate and 3-tab shingles?
A laminate is composed of two shingle strips glues together in a way that creates a random appearance. They are rated for 25, 30, 40, and 50 years depending on the quality and thickness. The weight per square is a one layer, flat shingle. It has vertical keyways (slots) across it to create its pattern. It is available in 25 and 30 year ratings.