Carpenter Red Seal Exam Prep · Question
When installing house wrap (WRB) on an exterior wall, how should the horizontal laps be oriented to ensure proper water shedding?
To shed water effectively and prevent it from migrating behind the WRB, the upper course of the house wrap must always overlap the lower course, similar to shin
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Question: When installing house wrap (WRB) on an exterior wall, how should the horizontal laps be oriented to ensure proper water shedding?
Answer options: ✅ Upper course over lower course
- Lower course over upper course
- Laps should be butted and taped
- Laps can be oriented either way, as long as they are sealed
Correct answer: Upper course over lower course
Explanation: To shed water effectively and prevent it from migrating behind the WRB, the upper course of the house wrap must always overlap the lower course, similar to shingle fashion. This ensures any water running down the wall stays on the exterior of the barrier.
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