CSLB C-39 Roofing ContractorSteep-Slope RoofingHard
A contractor is roofing a home in a region subject to ice damming. Per California Building Code requirements for steep-slope roofs in these areas, self-adhering ice barrier membrane must extend from the eave edge to a point how far inside the exterior wall line?
- A12 inches
- B18 inches
- C24 inches
- D36 inches
Show answer & explanationAnswer & explanation
Correct answer: C. 24 inches
In areas subject to ice damming, code requires a self-adhering waterproof ice barrier membrane to extend from the eave's edge to at least 24 inches inside the exterior wall line, protecting against water backup caused by ice dams.
Why the other options are wrong
- A. 12 inches is insufficient to protect against typical ice dam backup.
- B. 18 inches does not meet the code-required minimum extension.
- D. 36 inches exceeds the code requirement, though not prohibited.
Ice Barrier Underlayment
Self-adhering waterproof membrane required at eaves in ice-dam-prone regions to prevent water backup damage.
- Extends 24in inside exterior wall line from eave edge
- Required in areas with history of ice damming
- Provides secondary water barrier beneath shingles
Memory trick: Two feet inside keeps ice dams denied.