Under-floor wood needs treated or durable lumber when joists are within 18 in of the ground, girders 12 in or columns 8 in.
Siding, sheathing and framing need decay protection if closer than 6 in to soil or 2 in above an exposed slab or step.
Decay protection is also needed for framing within 8 in of ground on foundation walls, sills on ground slabs without a barrier, girder pockets under 1/2 in clearance, weather-exposed members and basement columns not on a 1 in pedestal.
Floor-to-Foundation or Load-Bearing Wall Connections
Steel floors are anchored to foundations, sills or walls per Table R505.3.1(1), with bolts within 12 in of corners and track ends; tighter spacing applies in Exposure C.
Steel joists get two No. 8 screws at each bearing track, and subfloor screws go 6 in apart at edges and 12 in in the field.
Searches all 4,276 IRC 2024 sections, 5,532 IBC 2024 sections and defined terms (Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 so far) and each city's local rules as they are added. Section numbers and titles from the International Residential Code and International Building Code, 2024 editions, copyrighted by the International Code Council; the IRC's electrical chapters (34 to 43) follow NFPA 70, the National Electrical Code. Requirements are summarized in our words (IRC Chapters 3 to 43, IBC Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33); read the full text at the link on each result. Local values come from each city's published documents.
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