Spray foam us kind of a double edge sword.
It can actually seal up a building too well when applied to everything on a wood frame building.
I say at least use the $5 spray can around doors and windows minimum to seal up gaps.
You should be able to do interior walls with spray foam if you want some sound deadening between room.
Spray foaming roofing may not be ideal. I would only do it under a metal roof.
The way I have done it on exterior walls I always put fiberglass between the window to floor. Just assume it's going to get wet, fiber glass won't rot and it can breath a little. I always use pressure treated around windows and doors. If the window is tucked nicely up under the eve I will spray foam up to the window or door frame. If the window or door is exposed by a high roof line I will fiberglass one stud out on both sides of the windows and doors incase it gets wet, which it will.
I spray foam around all exterior light junction boxes, it seals out the wind and bugs.
If your structure is all masonry, spray it by the truck load since it's already sealed up like a tomb and probably very water tight.
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