I'm going to be adding a second level on an attached garage and will be using engineered I joist for the span. The floor on top of joist must be glued and screwed.
So I'm not sure what I'm going to do for a vapor barrier under the floor as I will be insulating the joist space since the garage isn't heated.
I realize spray foam is the best but that's not in the budget.
I saw somewhere that the floor can be bought with a coating on it ???
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