Carpenter Red Seal Exam Prep · Question
A carpenter is installing a weather-resistive barrier (WRB) on a new residential build in a moderate climate. The building sheathing is OSB. What is the most appropriate overlap for horizontal seams of the WRB according to best practices?
Industry best practices and building codes typically recommend a minimum horizontal overlap of 100 mm (4 inches) for weather-resistive barriers to ensure proper
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Question: A carpenter is installing a weather-resistive barrier (WRB) on a new residential build in a moderate climate. The building sheathing is OSB. What is the most appropriate overlap for horizontal seams of the WRB according to best practices?
Answer options:
- 75 mm (3 inches) ✅ 100 mm (4 inches)
- 150 mm (6 inches)
- 50 mm (2 inches)
Correct answer: 100 mm (4 inches)
Explanation: Industry best practices and building codes typically recommend a minimum horizontal overlap of 100 mm (4 inches) for weather-resistive barriers to ensure proper shedding of water. Smaller overlaps like 75 mm or 50 mm increase the risk of water intrusion, while 150 mm is excessive and unnecessary for primary protection.
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