CSLB C-39 Roofing ContractorEstimating and PlanningEasy
A client's roof requires 21 squares of standard three-tab asphalt shingles. Each bundle covers 33.3 square feet, meaning three bundles equal one square. How many bundles must be ordered for the entire job?
- A70 bundles
- B21 bundles
- C63 bundles
- D42 bundles
Show answer & explanationAnswer & explanation
Correct answer: C. 63 bundles
Standard three-tab shingles are packaged 3 bundles per square. 21 squares × 3 bundles/square = 63 bundles.
Why the other options are wrong
- A. Overstates the bundle count beyond the correct multiplier.
- B. Confuses number of squares with number of bundles.
- D. Uses a factor of 2 instead of the correct 3 bundles per square.
Shingle Bundle Ratio
Standard three-tab asphalt shingles are packaged so that 3 bundles equal exactly 1 roofing square (100 sq ft).
- 3 bundles = 1 square for standard 3-tab shingles
- Each bundle covers about 33.3 sq ft
- Architectural shingles may use different bundle counts
Memory trick: Three's company: 3 bundles make one square.