Overview
ANATOMY An on-grade deck—one built just above the ground—doesn't require posts, steps, or railings. But it has the same structural elements as any deck—ledger, joists, beams and piers. Building one begins with determining the sizes of the framing material. Tom Silva uses these rules fo thumb: for rim joists or beams made of doubled-up 2x lumber, the boards' nominal width (in inches) should match the span (in feet). So a rim joist spanning 10 feet requires two 2x10s. The ledger is made from a single board of the same width. For interior joists, Tom halves the span then adds two—a joist spanning 8 feet warrants a 2x6. (In all cases, round up odd numbers or fractions to the next even number.)
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