CSLB C-39 Roofing ContractorEstimating and PlanningEasy
A roofing contractor measures a house and finds the total roof surface area (all planes combined) is 2,450 square feet. Rounding up to the nearest whole square with no waste added, how many squares should be listed on the material order?
- A25 squares
- B24.5 squares
- C24 squares
- D26 squares
Show answer & explanationAnswer & explanation
Correct answer: A. 25 squares
One roofing square equals 100 square feet. 2,450 ÷ 100 = 24.5 squares, and material is always rounded UP to the next whole square, giving 25 squares.
Why the other options are wrong
- B. Squares must be whole units when ordering material.
- C. Rounds down, which would leave material short.
- D. Overstates the requirement by a full square.
Roofing Square
A roofing square is a unit of measure equal to 100 square feet of roof surface, used to standardize material takeoff.
- 1 square = 100 sq ft
- Always divide total area by 100 to find squares
- Round up to the next whole square when ordering
Memory trick: 100 feet fits in one square foot of roofing math.