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Old 12-27-2012, 01:32 PM   #1
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New 4 ply 2 x 10 beam construction


I am building a cottage, the plans call for 3 beams to be made up for the floor to be built on. It calls for each one to be a 4 ply 2 x 10 beam of a 40 ft. length. What length of lumber would you use, how would you stagger it, and would you just nail it together or bolt it as well?

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Old 12-27-2012, 05:27 PM   #2
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New 4 ply 2 x 10 beam construction


If it's for a floor of 40ft span, 4-ply or any-number-ply 2x10s won't do, or have I misunderstood?

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Old 12-27-2012, 05:30 PM   #3
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New 4 ply 2 x 10 beam construction


do you have intermediate supports such as columns or piers? a 40' long beam as tony.g said is insufficient typically
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Old 12-27-2012, 06:08 PM   #4
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New 4 ply 2 x 10 beam construction


your also not giving info on if its one story, 2 story, if there will be bearing wallls on the first floor or location.. all these determine beam size and maximum span
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Old 12-27-2012, 06:11 PM   #5
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New 4 ply 2 x 10 beam construction


Quote:
Originally Posted by Rickyboy View Post
I am building a cottage, the plans call for 3 beams to be made up for the floor to be built on. It calls for each one to be a 4 ply 2 x 10 beam of a 40 ft. length. What length of lumber would you use, how would you stagger it, and would you just nail it together or bolt it as well?
Where on the plans are the columns/posts located ?
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Old 12-28-2012, 10:43 AM   #6
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New 4 ply 2 x 10 beam construction


it would be 4 piers (8' apart) with 16' lumber used to break on the piers. each ply- 16'x 16'x 8' lengths offset/staggered for each ply until all 4 plys are achieved.
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Old 12-28-2012, 12:11 PM   #7
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New 4 ply 2 x 10 beam construction


You say you have plans. Presumably these plans were developed either by an engineer or architect, who presumably developed the design based on the actual load of the house. It would be totally irresponsible for anyone on this forum to substitute their opinions for the actual design prepared by the professional who prepared the plans. If no professional prepared the plans, you have different issues, which likely cannot be addressed on an internet chat forum.

As to the proper method of fabricating the beams, that should have been specified on the plans, or possibly in specifications that came with the plans. Along with location, size, design, and attachment methods for any intermediate supports, and details for the joists. Forty feet is a long span, beyond normal tables, so design by a professional was appropriate.
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Old 12-28-2012, 12:39 PM   #8
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New 4 ply 2 x 10 beam construction


Even 2 X 10's sound light to me.
For runs that long I've been using LVL's or Gluelams.
I could buy them 40' long if that's what's needed.
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Old 12-28-2012, 04:10 PM   #9
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New 4 ply 2 x 10 beam construction


First pick the straightest lumber. You can account for some crowning, but at that length, you'll be building in errors. Designer called for 16' lumber, and I think that is due to his habit, but because you have supports every 8', you can make the beam with 8' or 10' lumber and may be decrease the number of plies you need, or keep it 4 plies for insurance. Joints must land on supports, if you choose to use short lengths. Exchanging 2x10 for 2x12 (have to change foundation pocket) is further insurance for future additions.

Each ply is overlapped at the half point, if you are using 16 footers. Use common 10 penny nails, about 1" from top/bottom edges. Even out the top edge as you nail. Then 1/2 bolts with washers every 16-18 inches, staggered. Lay out floor joists so nails/bolts don't coincide with joist hangers.
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Old 12-28-2012, 05:30 PM   #10
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New 4 ply 2 x 10 beam construction


Carpdad, what possible basis do you have to conclude that there are supports every 8 feet? And where do you see that the design called for 16 foot lumber? And why do you believe that the joints need to land on a support?

The OPS posted once, has not been back, and never stated what the support spacing is. Offering design advice for a 40 foot beam over the internet on a site you have never seen, and know virtually nothing about, is dangerous, and could lead to catastrophic failure if the OPS followed your directions, and it turns out they really do require a 40 foot clear span beam.

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