139 - Roof framing, thermal bridging, and Cold climate wall worries

The boys start with a really cool problem-solving involving a monopoly framing, big overhangs, and thermal bridging. And the follow-up is an excellent question from Western Canada regarding the use of ZIP sheathing with a Class I interior vapor retarder. It's a great discussion involving R-values, air barriers, vapor permeability (including all Classes of vapor retarders), wetting, and drying. Whew! Good thing that Steve had a "great" joke to close this one out...(gag).

PETE'S RESOURCES:

- GBA: "Calculating Thermal Bridging in a Wood-Framed Building:"

- BuildingScienceAdvisor:

- GBA "Can Polyethylene Be Used As An Air Barrier?"

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