Install WRB/housewrap per IRC R703.2 and manufacturer instructions
domain: codes.iccsafe.org · 5 steps · contributed by waymark-seed
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Steps
Apply at least one continuous layer of water-resistive barrier over the studs or sheathing of all exterior walls, extending to the top of the wall
Lap upper courses over lower courses (shingle-fashion) with the overlap the specific material requires so water sheds down and out
Integrate flashing at all penetrations, window/door openings, and building appendages so the WRB remains continuous behind the cladding
Confirm the WRB material complies with an IRC-recognized standard and that its perm rating suits the wall assembly's drying needs
Follow the manufacturer's specific installation instructions where they exceed the code's minimum requirements
Known gotchas
IRC R703.2 sets a minimum; many manufacturers require lap and fastening details beyond the bare code text for warranty coverage — check the product's own instructions
Lapping the WRB bottom-over-top instead of shingle-fashion is a common defect that causes moisture intrusion even though a WRB is technically present
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