CSLB C-39 Roofing ContractorEstimating and PlanningMedium
A skylight curb measures 24 inches by 48 inches. The manufacturer's flashing kit is designed for skylights up to this exact size and includes head, sill, and step flashing pieces sufficient for the entire perimeter of one skylight. If a contractor is installing 5 identical skylights on the same roof, how many flashing kits must be ordered?
- A5 kits
- B6 kits
- C4 kits
- D3 kits
Show answer & explanationAnswer & explanation
Correct answer: A. 5 kits
Since each flashing kit is designed to cover the full perimeter of exactly one skylight of this size, installing 5 skylights requires 5 complete flashing kits, with no sharing of components between units.
Why the other options are wrong
- B. This orders more kits than needed, wasting material and budget.
- C. This would leave one skylight without complete flashing.
- D. This would leave two skylights without complete flashing.
Per-Unit Flashing Kit Takeoff
Prefabricated flashing kits sized for a specific unit (such as a skylight) must be ordered on a one-kit-per-unit basis, since components are not designed to be split or shared between separate installations.
- One kit per unit unless the manufacturer states otherwise
- Kits include head, sill, and step flashing pieces sized to the curb
- Always match kit size rating to the actual skylight dimensions
Memory trick: One skylight, one kit—no sharing the pieces.