foam insulation

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.

-- Failure does not stop me, it makes me try harder..... because I'm crazy.

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