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.

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