Carpenter Red Seal Exam Prep · Question
A carpenter is installing a rainscreen system on a 3-storey wood-frame building. What is the minimum recommended clear airspace depth required behind the exterior cladding?
CSA A440.4-19 / CAN/CSA-A440.4-19, 'Windows, doors, and unit skylights – Installation,' recommends a minimum 19 mm (3/4 inch) clear airspace for rainscreen wall
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Question: A carpenter is installing a rainscreen system on a 3-storey wood-frame building. What is the minimum recommended clear airspace depth required behind the exterior cladding?
Answer options:
- 10 mm
- 6 mm ✅ 19 mm
- 25 mm
Correct answer: 19 mm
Explanation: CSA A440.4-19 / CAN/CSA-A440.4-19, 'Windows, doors, and unit skylights – Installation,' recommends a minimum 19 mm (3/4 inch) clear airspace for rainscreen walls to allow for effective drainage and ventilation.
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