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Old 07-13-2012, 05:22 PM   #16
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Beam lateral support - Joists on top


Wow... So you're telling me.... If that column is midspan..... Then the 3 2x12's do NOT have to be continuous from Point A the wall, to Point B the column??? They could have used a bunch of 6' cutoffs laying around the jobsite and call it good??????? Lets just say that column is midspan 14'6.... There should have been SIX pieces of 2x12's cut 14'6, and the break should have been at the column, not anywhere larry, curly, or moe wanted to make it. And I stand firm on that... And yes, I'm well aware that things aren't solid pieces 700' long for bridges.

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Old 07-13-2012, 09:11 PM   #17
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Beam lateral support - Joists on top


I simply pointed out that your understanding of the term continuous was incorrect based on your post. And I defined very carefully the required connections between individual pieces that allow a continuous span to be built from short pieces, specifically that the fasteners be adequate to carry full moment and horizontal shear across joints. This is not particularly difficult to do, with wooden members it is quite typical to drive 16d nails every 6 inches in a staggered pattern, and this is generally accepted as full moment and shear capacity without analysis, although in some cases a mathematical analysis may be required. It is certainly possible to build a fully continuous wooden beam from relatively short members, so long as the fastener pattern is correct.
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Old 07-13-2012, 10:09 PM   #18
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Beam lateral support - Joists on top


If we were speaking about top plates then I would have to agree with you. And I suppose I was using the term continuous loosely. As in my 20 years of framing I have never assembled, a header, or beam with splices that you speak of. Top plates, sure, splice away. You say it's quite typical to splice wood together. Maybe 30 years ago. It is not typical as I have never seen it done that way. If you have a 15' header in a 2x6 wall. It's 3 solid pieces of 2x, 6x member, or glulam beam. If you have a 30 foot span, its a gluelam beam. No splicing of 2x12's.. Back to the OP though.. I still feel as if it should have been a solid member from A to B, as with the splices in the 2x12 are coming apart,not lapped properly in the least, knots that appear could very well go all the way through the member, it is rolling what appears to be at least an inch, and I feel it was improperly built. That is my opinion, if you guys see it as "typical" then so be it.
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Old 07-15-2012, 07:41 PM   #19
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Beam lateral support - Joists on top


What Daniel is really saying is that a beam CAN be made of pieces of wood providing the fastening system that holds those pieces together is sufficient enough to distribute the loads. What you're thinking of Copper is the "rule of thumb" that exists in the field in that you make the members span the full width. That rule of thumb is a general safety measure against the weekend DIYer's and non-engineer carpenters who may not provide enough nails to make such a piece-meal beam work. In the case of the OP, the beams seems to have been constructed well enough since the structure it is supporting is still straight and true, despite the beams actual appearance.

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