Carpenter Red Seal Exam Prep · Question
Which of the following materials is typically considered both an air barrier and a vapour barrier in a Canadian residential wall assembly?
6 mil (0.15 mm) polyethylene sheet is commonly used in Canada as a combined air and vapour barrier due to its low permeability to both air and moisture vapour.
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Question: Which of the following materials is typically considered both an air barrier and a vapour barrier in a Canadian residential wall assembly?
Answer options: ✅ 6 mil (0.15 mm) polyethylene sheet
- House wrap (spunbonded polyolefin)
- Exterior fibreboard sheathing
- Rigid insulation board (without taped seams)
Correct answer: 6 mil (0.15 mm) polyethylene sheet
Explanation: 6 mil (0.15 mm) polyethylene sheet is commonly used in Canada as a combined air and vapour barrier due to its low permeability to both air and moisture vapour. House wrap is primarily an air barrier and water-resistive barrier, but not a vapour barrier.
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