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Old 05-26-2013, 05:36 PM   #1
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Basement Open Truss Soffit,Vapor Barrier


Finishing up a basement wall and ceiling project.
The floor is of the open truss construction,and when ceiling is sheetrocked it will leave an approximately 2 foot open area above between the rock and the bottom of the first floor.
Perimeter cavities have been insulated with ROXUL.
My question is,do I need to put a vapor barrier up in the cavities?

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Old 05-26-2013, 06:23 PM   #2
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Basement Open Truss Soffit,Vapor Barrier


Where are you located?

Gary

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Old 05-26-2013, 07:08 PM   #3
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Basement Open Truss Soffit,Vapor Barrier


Zone 5 Gary,sorry about that
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Old 05-27-2013, 12:16 AM   #4
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Basement Open Truss Soffit,Vapor Barrier


Thanks. Just seeing if my answer is pertinent or not. The rim board/OSB/plywood will be the temperature of the outside climate. On the inside it will be R-1.25 (per inch of solid wood) degrees less than exterior temp. Any vapor barrier used requires complete air-tightness or it will fail, which is why I always suggest foam/with canned foam or caulking; http://www.buildingscience.com/docum...ce-insulation/

How much, Zone 5? http://www.buildingscience.com/docum...r-requirements

It requires great attention to keeping the air barrier intact; http://www.carb-swa.com/articles/in%...Insulation.pdf

Be sure to air seal the framing/drywall ceiling and all plumbing/wiring/heating ducts/etc. holes that can admit air to the floor system cavities. http://www.buildingscience.com/docum...wall-approach/

I really don't see how a vapor barrier will work with an open truss floor as yours. IMHO, just add foamboard behind the Roxul (against rim). Pages 14-19 (even used Chicago- Zone 5); http://www.buildingscience.com/docum...ting-sheathing

Gary
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