alternating tread devices

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1 article tagged with “alternating tread devices”.

Wooden ship's ladder stair with alternating treads in a loft interior

Ship Stairs and Alternating Tread Devices: When Code Allows Them

Ship stairs and alternating tread devices can legally reach a loft or mezzanine where a full stair will not fit. Here are the IRC rules, exact dimensions, and space-saving math.

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Calculations are for reference only. Always verify with local building codes.