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Got another question about the vapor barrier in our car port/workshop. I'm putting in R28 insulation and was thinking of putting a layer of GPS over that and then covering with a soffit material. 2 x 10 I-Joists. Really not sure if this should be covered in poly with acoustic sealer or not? There seems to be a few different opinions on how this should be done including the insulation. Any advise would be helpful.