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QUESTION & ANSWER

Professional Deck Builder

November 2009
Maximum height for a 4x4 post

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QUESTION & ANSWER Maximum Height for a 4x4 Post Q Is there a maximum allowable height for a 4x4 deck support post? A Glenn Mathewson, a building inspector from Westminster, Colo., responds: Unfortunately, there are few pre-engineered and universally accepted standards that address this question. The International Building Code and the International Residential Code (IRC), the foundations for most of the building codes in the United States, specify only that a post must be at least a 4x4. This isn't meant to imply that 4x4 posts are good for all conditions, merely that there's no condition where less than a

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