CSLB C-39 Roofing ContractorEstimating and PlanningHard
A hip roof has a ridge line of 36 linear feet and four hips measuring 14 linear feet each. Ridge cap shingle bundles cover 25 linear feet per bundle. Applying a 10% waste factor, how many bundles of ridge cap should be ordered?
- A4 bundles
- B6 bundles
- C5 bundles
- D7 bundles
Show answer & explanationAnswer & explanation
Correct answer: C. 5 bundles
Total linear footage = 36 ft ridge + (4 × 14 ft) hips = 36 + 56 = 92 ft. With 10% waste: 92 × 1.10 = 101.2 ft. Bundles needed = 101.2 ÷ 25 = 4.05, rounding up to 5 bundles.
Why the other options are wrong
- A. Omits the waste factor, understating true need.
- B. Overstates requirement beyond the calculated value.
- D. Significantly over-orders material.
Ridge Cap Takeoff
Ridge cap material quantities are determined by summing all ridge and hip linear footage, applying a waste factor, then dividing by bundle coverage.
- Add ridge length plus all hip lengths together
- Apply standard waste factor (commonly 10%)
- Divide total adjusted footage by bundle coverage and round up
Memory trick: Combine every hip and ridge before dividing by bundle length.