frost depth

Posts tagged #frost depth

1 article tagged with “frost depth”.

Deck staircase under construction with concrete pier footings and sonotube forms in the ground

Deck Stair Footings: Frost Depth, Pads, and Post Bases

Deck stairs need footings below the frost line. This guide covers the required depth per IRC R403.1.4, how to size concrete piers and pads, choosing post bases that keep wood dry, and a step-by-step pour.

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