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Joist bay insulation, vapour barrier and condensation – GreenBuildingAdvisor
- July 20, 2025
- Posted by: wendy
- Category: Uncategorized
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I posted about this a while back but want to make absolutely sure I understood correctly…
Zone 6, 1 inch silverboard xs (micro perforated) on the exterior, 1-1/8″ rimboard, 2 inch siverboard (non-perf) on the inside in the joist bays with the edges foamed in (tytan extreme window and door).
Am I safe to add fiberglass against the 2 inch foam in the joist bays without concern for condensation behind the fiberglass?