What is the difference between a cedar shake and a shingle?
The most significant difference is the amount of material that is exposed to the weather. An 18″ shake has 7.5″ exposed. An 18″ shingle has 5.5″ exposed to the weather. Thus, shingles applied at 5.5″ becomes a 3 ply roof (there are 3 layers of shingles at any spot on the roof), while shakes are 2 ply. Shakes are layered with felt between each layer, thus having 2 layers of felt at any spot. No felt is required for each layer of the shingles.