AC174 Deck Board Span Ratings and Guardrail Systems (Guards and Handrails)—Approved January 2012, editorially revised Dec 2019 (PDF Download)
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AC174 deals with deck board span ratings and guardrails. Deck boards, in this case, are restricted to use in exterior applications for residential buildings classified as Type V-B (IBC), Type V-N (UBC), Type 5B (BNBC), or Type VI (SBC) construction; and to dwellings regulated by the IRC. The document also deals with evaluation of guardrail system performance in exterior applications for residential and/or nonresidential buildings classified as Type V-B (IBC), Type V-N (UBC), Type 5B (BNBC), or Type VI (SBC) construction, and dwellings regulated by the IRC.