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Span entries are listed for 2×6 through 2×12 joists and 12 in., 16 in., and 24 in. on-center spacing. The illustrations (one for cantilever joists and one for flush rim-beam hung joists) point out where joist span measurements are taken from — the saddle of the ledger mounted joist hanger to the center of a dropped beam or saddle of the ...
The recently completed 16- by 24-foot building has 2×4 walls and a roof with a 2×10 ridge and 2×6 rafters. It was only after the building was up did Leo realize he hadn’t figured in the added weight of the lumber on the ceiling joists. “The 16-ft. 2x6s are there to keep the 2×6 rafters from spreading,” he writes.
Deck builders can now refer to Section R507.6 Deck Beams and Table R507.6 Deck Beam Span Lengths to determine the size of 2-ply and 3-ply built-up beams made from 2×6 through 2×12 lumber. These values didn’t change in the 2018 version of the IRC. (For more on other aspects of framing an elevated deck, have a look at this guide.)
The lumber is6" vertical, 2" horizontal (nominal). It is a wierd connection - the metal plates are on the 2" sides of the 2x6 (top and bottom) and the bolt is about 7" long, through the end of the 2x6's. The smooth holes are 2 1/2" from the ends of the 2x5's.
Another consideration to keep in mind when you are specifying a beam is its resistance to bending. To compare built-up wood beams, I multiply beam width by beam depth squared, and then I divide the product by 6. A triple 2×10 beam has a bending-resistance factor of 64.2; add plywood between the 2x10s, and the factor increases 15% to 73.7.
8" oc would reduce the span for your subfloor material, but makes no difference at all in terms of joist strength and deflection. It reduces the space in the joist bays from 14 1/2" to 6 1/2", which will be a royal pain for any HVAC, plumbing and electrical work, not to mention blocking. -- J.S.
Where sixteen foot spans demand 2x10, the strength multiple is 1.5/2 * cube of (9.25/6). The multiple is 2.7. Again, if the structure had been built with more old growth real 2x6, a multiple of 2.0 would come with 6 1/2" between joists. A sistering new crummy 2x6 aiding only through nail attachment might give a multiple of 1.5, something ...
RE: 6 x 6 or three 2 x 6's ? Mike Mike (Structural) 23 Oct 21 16:59 xtal - my gut says any of the 4 options will be fine. 6X6, (3) 2X6, (3) 1.5"X5.5" LVL, or steel. my gut says you should not buy the cheapest grade in the yard if you go with a sawn lumber option.
Mostly framed with 2 x 4 walls and headers were simple (2 -2x + 1/2″ ply…done)but I have started doing 2 x 6 walls. My methods for making headers for the 5-1/2″ wall thickness seem to be to time consuming. Looking for ideas that’s are quick and cost efficient and will still make the inspectors happy. Thanks, Chris
Common deck-stair tread configurations include two pieces of 5/4×6 or 2×6 lumber, three pieces of 5/4×4 or 2×4 lumber, or a single piece of 2×12 lumber. Pick whichever configuration you wish, but for 5/4 treads, stringers need to be spaced no more than 12 in. apart, and for 2x treads, stringers are spaced no more than 16 in. apart.