WebMar 6, 2024 · The rim joist can be insulated using a flash-and-batt method: Apply 2 inches of closed-cell spray foam to the rim joist to reduce the potential for condensation, followed by fiberglass batts. Mechanicals. Besides properly detailing the foundation, ... WebSome flash and batts approaches only flash the perimeter and the penetrations. That creates a varying vapor profile, which in turn can have moisture condensing in a variety of places within the wall. Others that flash the entire exterior face do it with an inappropriate depth with the same results.
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WebJan 30, 2011 · If you decide to use foam against the wall sheathing in a flash-and-batt type installation, the more foam you use the better. Make sure you don't install a poly vapor barrier but do seal edges and penetrations in your drywall or backer board. Additionally, you should be sure to run your bath fan until no moisture remains in the bathroom. WebMar 4, 2014 · That's not really a "Flash", it's more a of a belt & suspenders approach. Which I like, however, my bank account doesn't. Don't be offended, I'm just double checkiong. Also, I'm still not hearing your opinion on the foam injection for the Timber Frame side. I visualize basically a flash & batt method except that the foam is injected from the ... essai zoe r90 zen
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WebNov 15, 2014 · Thermal Control. Installed insulation R-value: The installed R-value is approximately R-12 for two inches of high density spray foam (2.0 pcf) and R-13 for three and a half inches of fiberglass batt, totaling R-25. … WebJun 23, 2024 · - Flash and Batt requires you to use a reverse vapor profile for the wall, meaning you are putting your air-tight barrier and vapor control line at the exterior/cold of the assembly in a heating climate. WebMar 17, 2024 · We are working on a project in Climate Zone 6 and have specified rigid exterior insulation (2" XPS) over 2x4 framing with fiberglass batts or cellulose wall insulation in stud cavities. We detail to seal at … hb bau mainburg