Vapor Retarder Slab Code: Complete 10 Mil Rule & Sealing Tips
If you’re pouring a concrete slab under a conditioned space, the vapor retarder beneath slab code requirements in the 2021 IRC mandate a vapor barrier—and not just any plastic sheet. The 2021 IRC made an important change: under Section R506.2.3, the minimum vapor retarder thickness was increased from 6 mils to 10 mils. Why the … Read more