Most steel building insulation already includes a vapor retarder over the fiberglass batt. Make certain your insulation is sealed at the ends by rolling the vinyl-backing over the ends or taping the side-laps wit plastic tape.
Screw Area Recommendations
The area to be taped need to be mechanically brushed to remove dust and oil deposit from the ambience. A cleaner such as rubbing alcohol needs to then be applied to eliminate post-brushing deposit. The final quality control step is to take a look at the outdoors sides to guarantee there are no spaces or loosened places.
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