New Height Limits for Deck Posts?

A proposed expansion of the IRC's Table R507.4 would allow builders to size posts based on expected loads and wood species.

Among the dozens of proposals under consideration for the next (2021) edition of the IRC, of special interest to deck builders is RB184-19, a comprehensive reworking of section R507, the part of the building code that addresses residential decks. If the proposal passes as written, expect to see some big changes, including new guidelines for determining deck post height as illustrated in the chart below.

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About the Author

Glenn Mathewson

Glenn Mathewson is a consultant and educator with BuildingCodeCollege.com, and a frequent presenter at JLC Live.

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