My barn measures 44' x 30'. I'm going to section part of it off for a wood shop measuring 20' x 30' with a second floor for storage. My question us can I get away with 2 - 20' - 2 x 12 at the 10' and 20' with 2 x 6. would this be sufficient? Want to have shop with clear span no posts. drawing attached
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floor joist support
- Thread starter yetisas
- Start date
bob15
Well-known member
Have you looked for two steel I beams instead of the double 2x12's? Or even laminated/engineered beams.
What are your eight columns going to be? Steel or wood beams?
As for the 2x6's, without knowing what you will have up there, I would go with a 2x8. Bigger is better.
What are your eight columns going to be? Steel or wood beams?
As for the 2x6's, without knowing what you will have up there, I would go with a 2x8. Bigger is better.
Kenc
the double 2 x 12 will be supported by the building walls on one end and 4-2x6 on the other end. storage stuff will mostly be pool equipment, deck chairs and tables etc. stuff I don't want cluttering the rest of the barn.
Bob15
the 8 columns your referring to are actually the 2x6's in-between the double 2x12 beams
the double 2 x 12 will be supported by the building walls on one end and 4-2x6 on the other end. storage stuff will mostly be pool equipment, deck chairs and tables etc. stuff I don't want cluttering the rest of the barn.
Bob15
the 8 columns your referring to are actually the 2x6's in-between the double 2x12 beams
engineer031
Well-known member
I would use 2x8 stringers down the road you or someone else may put something heavier up there and the cost wont be that much more to do it now
ddawg16
Well-known member
If there are NO plans for any type of storage up there....you are right at the edge when using the span tables. But, I can't imagine putting in a ceiling in your barn if you don't plan to use it for storage.
Steel beam or PSL beam. For reference, my garage is 20' wide and I have 16"x7" PSL beam spanning the middle.
If you put in one center post, (assuming you have posts on the sides and back) you now are dealing with a 15' span. That will make a big difference on the size of your joists.
Steel beam or PSL beam. For reference, my garage is 20' wide and I have 16"x7" PSL beam spanning the middle.
If you put in one center post, (assuming you have posts on the sides and back) you now are dealing with a 15' span. That will make a big difference on the size of your joists.
bob15
Well-known member
Kenc
the double 2 x 12 will be supported by the building walls on one end and 4-2x6 on the other end. storage stuff will mostly be pool equipment, deck chairs and tables etc. stuff I don't want cluttering the rest of the barn.
Bob15
the 8 columns your referring to are actually the 2x6's in-between the double 2x12 beams
So what is holding up the corners? Still would go with a couple I-beam's and 2x8's. Or a single I-beam in the middle and 2" x 12" x 16'.
theoldwizard1
Well-known member
I am not a structural engineer or a professional carpenter, but my gut say 3 not-doubled 2x10 would probably be fine. If you are going to stay with 10' spacing, I would upgrade with to 2x8s.
Actually, if is just storage, I'll bet you could use one doubled 2x12 and 2x8s.
The real key is how are you going to attach it to the existing wall ? Nails, lags, and even bolts are NOT adequate ! Use joist hanger at least for the the beams. The beams need to have support DIRECTLY underneath them, down to the floor.
Actually, if is just storage, I'll bet you could use one doubled 2x12 and 2x8s.
The real key is how are you going to attach it to the existing wall ? Nails, lags, and even bolts are NOT adequate ! Use joist hanger at least for the the beams. The beams need to have support DIRECTLY underneath them, down to the floor.
Justanoldguy
Well-known member
I love these type threads.
They get more and more complicated as they go on.
Good luck.
They get more and more complicated as they go on.
Good luck.
warren57
Well-known member
Depends on load in your area, type of lumber being used, what the loft is going to be used for (live load) and weight of construction materials (dead load) etc.
Go online and there are volumes of information on rafter sizing and floor joist sizing.
A general rule of thumb to support roof load over a 16' garage door is 3- 2x12's nailed together. And this has no additional load like a loft would add.
Chances are you should go with a glue lam beam. Easier to handle, cheaper in the long haul. And very strong.
Go online and there are volumes of information on rafter sizing and floor joist sizing.
A general rule of thumb to support roof load over a 16' garage door is 3- 2x12's nailed together. And this has no additional load like a loft would add.
Chances are you should go with a glue lam beam. Easier to handle, cheaper in the long haul. And very strong.
tcianci
Well-known member
Take that drawing to any lumber dealer that sells engineered wood beams. He will have the software to determine not only the size of the members needed but the fastening schedule and support member sizes as well and they do it all for free.
Advice on here is worth what you paid for it: Nothing
Engineered drawings that will be accepted by a municipality for permitting purposes: Priceless
Advice on here is worth what you paid for it: Nothing
Engineered drawings that will be accepted by a municipality for permitting purposes: Priceless