What are the dimensions of a standard asphalt strip shingle?

• A. 8" X 16"
• B. 24" X 24"
• C. 12" X 36"
• D. 10" X 30"

Answer: (C)

A standard asphalt strip shingle measures 12 inches in width and 36 inches in length. This size is the industry norm because the 12-inch width aligns with the typical nail line spacing and allows a uniform, consistent pattern when shingles are overlapped. The 36-inch length provides enough material for a full roofing course, enabling a predictable exposure and efficient coverage when multiple shingles are laid across the roof. These dimensions also fit common bundle quantities and roofing calculations, making material planning straightforward.

Other dimensions don’t fit the typical installation practice for strip shingles, which is why they aren’t considered standard. The 12 by 36 size is what you’ll most often encounter on standard residential roofs.