CSLB C-39 Roofing ContractorSteep-Slope RoofingMedium
A roofing contractor is installing a new roof on a building where a skylight penetrates the roof plane. To ensure a watertight seal and proper drainage around the skylight, which of the following flashing components are essential for a complete and effective flashing system?
- AHead flashing, apron flashing, step flashing, and sill flashing
- BHead flashing, apron flashing, step flashing, and curb flashing
- CHead flashing, apron flashing, and step flashing only
- DHead flashing, apron flashing, step flashing, and counter flashing
Show answer & explanationAnswer & explanation
Correct answer: D. Head flashing, apron flashing, step flashing, and counter flashing
A complete skylight flashing system typically includes head flashing (top), apron flashing (bottom), step flashing (sides), and counter flashing. Counter flashing is crucial to cover the top edge of the step and apron flashings, directing water over them.
Why the other options are wrong
- A. Sill flashing is not a standard term for skylight flashing; apron flashing covers the bottom.
- B. Curb flashing is part of a curb-mounted skylight installation but doesn't replace the need for counter flashing over the other components.
- C. This option is incomplete; it lacks a crucial component like counter flashing.
Skylight Flashing System
A series of interconnected metal components designed to divert water away from the junction of a skylight and the roof plane.
- Prevents water leaks around roof penetrations.
- Consists of multiple overlapping pieces.
- Critical for long-term roof integrity.
Memory trick: Head, Apron, Step, Counter — the water's master.