Quote:
Originally Posted by speede5
True, but is it more expensive than ripping out the entire interior to add Poly? spray foam forms its own vapour barrier hence the suggestion.
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Comment not directly meant to apply to surferguy's situation:
Theoretically it does but technically spray foam delaminates from the wood as expansion, contraction and shifting happens creating air paths. We still poly when spray foaming as good practice on new builds. Though not likely a huge concern on a detached garage. Attached garage is a different story where I would do it in order to barrier against exhaust fumes, especially under a living space.