Vapor barrier over 1920’s garage slab

I have a client that wants to turn an unused garage on the 1925 house into a workshop area that is insulated and conditioned with a mini-split. I’m looking for recommendations… I have a client that wants to turn an unused garage on the 1925 house into a workshop area that is insulated and conditioned with a mini-split. I’m looking for recommendations…Read MoreGreenBuildingAdvisor