What is the difference between 3-tab shingles and Architectural shingles?
A. A three-tab shingle is the old style that has been around for many years. These shingles are a single layer of granular material with two slots cut in the fiberglass mat. When installed these shingles have a distinct pattern of slots on the roof surface. Architectural shingles are made of two pieces of material laminated together to produce a three dimensional effect. The laminations appear to be random and do not usually have a pattern.