Is a vapor barrier of value in this 40′ x16′ barn ??? Built on a concrete slab( no insulation under it). The walls are insulated R19. The doors, two, are inexpensive overhead garage doors. The windows(few) are single thickness glass. I plan to heat it ONLY when I am working for a hour or more(woodworking and crafts). It will be heated with a small oil burner – hot air. Also a contractor told me to use plastic sheeting instead of Tyvek(or equivilent) over the sheathing and under the siding. For this building will the plastic work?? Thanks in advance.
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