foam insulation

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Forum topic by chopper6322 posted 06-05-2012 01:14 PM 926 views 0 times favorited 2 replies Add to Favorites Watch
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59 posts in 2611 days

06-05-2012 01:14 PM

Now, I may be way off on my knowledge of insulation, but i have heard it said that an airgap between the wall and insulation is helpful, i’m getting ready to begin installing foam inulation in my shop and my question is do i want the insulation pressed against the outside metal wall or flush with the studs so it will be against the OSB inner wall? I’m not sure if I’ve explained this well, but any help is appreciated, thanks guys.

-- "As iron sharpen iron, so one man sharpens another" Proverbs 27:17

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3104 posts in 2484 days

#1 posted 06-05-2012 02:01 PM

I see you’re in TX, which will sometimes render different advice than if you were in Canada. You’re insulating against the heat most likely and you have severe humidity issues.

Spray the metal and the studs, but not the nailer part of the stud (where you’d normally attach drywall). You’ll want as much as you can on the metal to prevent air flow. Be sure to adequately vent the roof with soffit vents if you have soffits, and roof vents. Don’t foam over those.

If you’re talking about foam board insulation then you’ll want to also press that against the outside wall followed by a 6 or 4 mill plastic vapor barrier. This barrier should cover the entire wall and be overlapped and taped according to code. Tape every hole and joint, floor too. The idea is to let no air behind the sheetroc. Spray foam even the outlet boxes air tight.

-- A positive attitude will take you much further than positive thinking ever will.

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59 posts in 2611 days

#2 posted 06-05-2012 02:27 PM

Thanks Russell, when you talk about spraying the metal, is that with the expandable foam insulation? and also about venting the roof, there is no soffits and no attic in it either, should i put an attic in for better insulating? or just treat the ceiling the same as the walls?

-- "As iron sharpen iron, so one man sharpens another" Proverbs 27:17

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