Joist: 2x8 If joists are spaced: 24" Span: 10 1/2'. Joist: 2x10 If joists are . Codes specify maximum spans according to the type of wood used. A deck more than 2.
If you see a deck framed with 2x8 pressure treated lumber (typically Southern Yellow . (8" -2) x 2 = 12' = maximum allowable span for a generic "deck floor joist".
1 and No. 2 Grade of Douglas fir and maximum span floor joists - imperial units. . (inches), Joist Spacing Center to Center . 2 x 8, 12, 16' - 6", 15' - 10", 15' - 7".
Find out how far your deck joists can span when framing your deck. Choose from Southern Pine, Ponderosa Pine and Western Cedar and from 2x6 up to 2x12 joists.You can change the on center . 2 x 6, 2 x 8, 2 x 10, 2 x 12. Joist Spacing.
Mar 8, 2015 . The 2015 IRC includes a new table R507.5 Deck Joist Spans for Common Lumber Species. . for deck builders to spec a joist size for a given span and joist spacing. . Span entries are listed for 2×6 through 2×12 joists and 12 in., 16 in., . So run the table by your building official for approval before using it.
A southern pine (2) 2x12 beam can span 8 feet when supporting joists spanning a maximum of 14 feet, and it can cantilever 2 feet beyond the posts on each.
Consider span, spacing, and depth to build beyond code for a small upcharge. . suggest an imminent structural failure, just joist spans stretched to the max. . Spacing 2x10 joists at 16 inches, instead of 24 inches, on-center provides a.
2x6 joists should only be used on ground-level decks that do not require, and will . to strengthen the deck frame or to increase maximum allowable joist spans.