"In order to make the air gap above the insulation work effectively, the framing must be airtight at the joist end as well as have a continuous air barrier, and preferably some continuous insulation below the joists. You are essentially creating a…"
"My mind runs back to this article from Joe Lstiburek
BSI-064: Bobby Darin and Thermal Performance
Seal and insulate the Rim Joists first and then add continuous insulation on the underside of the joists. In the Kansas City Market, we have…"
"The thin application of expanding foam along the perimeter has a much lower R-value than the foam board. There are also small gaps between the foam board and the roof deck as others have pointed out.
When I install with foam board and expanding…"
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