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Most decks can be supported by wood posts resting on concrete footings, piers, or a combination of the two.
Size. Assuming a minimum soil bearing capacity of 1,500 psf, 8-inch-diameter concrete piers bearing on square footings measuring 2 feet on a side and 9 to 11 inches thick are adequate for most single-story decks where beams are spaced 14 feet apart or less and joist spans are 14 feet or less (see Footing Size table).
With a background as a cabinetmaker and general contractor, Michael Chotiner is a home improvement and building products expert. His work appears in BUILDER, REMODELING, and THE JOURNAL OF LIGHT CONSTRUCTION, among other publications.