Hey all, we just recently had a metal garage put up and i am wanting to insulate. I think we’re settling on using 2” foam board, mostly because of cost. I know theres better options, but cost and me doing it is the driving factor. The foam would be glued up, and at a later time will be covered in 1/4” plywood. My question is theres a crap ton of air gaps, all because of the shape of the metal. (See pics) do these need to be sealed with spray foam before putting the foam board up or should i leave them to let it breathe?