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But the 2015 IRC included a new one (Table R507.5) that will make it easy for deck builders to spec a joist size for a given span and joist spacing. The table includes spans for common lumber species used for deck framing like southern pine, Douglas fir, hem-fir, redwood, western cedar and other species. The table accounts for wet service ...
Engineer 10 adds that a No. 2 2×6 over a 16-ft. span can carry 10 psf while a 2×8 will carry 20 psf. Sistering the two together means a load-carrying capacity of 30 psf. “This is based on bending strength only not deflection, therefore a load larger than that will cause collapse,” he writes. “The load can be considered permanent dead ...
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. A beam of four 2x10s and no plywood has 18% more bending resistance than three 2x10s with plywood, but ...
erick | Dec 12, 2005 11:08pm | #9. Ditto, with a properly sized beam down the middle doubled 2X6's should be fine. However , instead of sistering and worrying about properly connecting, they seem to still be adequate @ 8" o.c. (HF #2), basically dropping one in between, given 3/4" glued & screwed plywood.
For example, a double 2×8 beam can span 8-ft.-9 in. when the deck joists are 6 ft. long. When the deck joists are 8 ft. long, the beam can span 7-7. When building a deck with 7-ft. joists, you know the beam can span somewhere between 7-7 and 8-0, but you don’t know exactly where. Check with your local code official, or simply drop back to ...
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. I can check the metal plates for bearing and tension, and the net section of the 2x6 ...
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.
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 ...
Dimensional shrinkage of pressure treated lumber. I’m building a deck to an existing elevation using 2 x 8 pressure treated lumber. It measures 7 1/2″ and the wood has a moisture content that ranges anywhere from 30% to 50% on these new boards with an average rating of near 35%. The small town home center said that the lumber was kiln dried ...
2 x 6 Walls – Header Construction. Hi All, 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 ...