Carpenter Red Seal Exam Prep · Question
A carpenter is installing a new vinyl window on a building with a fibreglass batt-insulated wall. What type of backer rod and sealant combination is most appropriate for creating a durable and flexible exterior seal around the window frame while allowing for movement?
A closed-cell backer rod is ideal as it prevents the sealant from adhering to the back of the joint, allowing the sealant to stretch and compress effectively. S
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Question: A carpenter is installing a new vinyl window on a building with a fibreglass batt-insulated wall. What type of backer rod and sealant combination is most appropriate for creating a durable and flexible exterior seal around the window frame while allowing for movement?
Answer options: ✅ Closed-cell backer rod with silicone sealant.
- Open-cell backer rod with butyl caulk.
- Closed-cell foam strips with acrylic latex sealant.
- No backer rod, just a thick bead of polyurethane sealant.
Correct answer: Closed-cell backer rod with silicone sealant.
Explanation: A closed-cell backer rod is ideal as it prevents the sealant from adhering to the back of the joint, allowing the sealant to stretch and compress effectively. Silicone sealant provides excellent adhesion, flexibility, and weather resistance, making it suitable for exterior window sealing. Butyl caulk and acrylic latex sealants are generally less durable or flexible for this application, and omitting a backer rod can lead to premature sealant failure.
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