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Old 09-06-2010, 05:46 PM   #1 (permalink)
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Truss spacing

Need help deciding on this.

I'm in Arkansas and I live on 10 acres in the country. I say this to say that codes and permits are a non-issue.

I am building a 30x40 pole barn. My poles are going to be 10 feet on center.

I am trying to figure out how far apart to put the trusses?

I know on houses you go 24 inch centers. Most pole barn manufacturers go 48 inches and some 5 feet.

The trusses are all 2 x 6 and are being recycled from a poultry house.

I plan to use 2 x 4's laid flat every 2 feet as purlions. Then I will use sheet metal to roof.

My annual snow fall is less than 12 inches and the trusses have a 4/12 pitch. thx
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Old 09-06-2010, 07:06 PM   #2 (permalink)
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My grandpa's house was on 16's

I build a menards wood barn shed thing for their lumber yard that was 6' OC.

Somewhere inbetween should suit you just fine.

FWIW we get 20+" of snow at times.

EDIT: The menards wood barn had 24" OC perlins.

Last edited by Jbevs; 09-06-2010 at 09:00 PM.
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Old 09-06-2010, 08:09 PM   #3 (permalink)
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what was the truss spacing on the original structure?? I wouldn't change from the original design unless you ran it by a local truss company first...

IMO you could likely run 48" centers on the truss (safely) and 24" centres on the 2x4 pulins. I wouldn't want the steel to span more than 24" without support.

Last edited by Leyland; 09-06-2010 at 08:18 PM.
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Old 09-06-2010, 09:56 PM   #4 (permalink)
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Get one of these, it should answer all of your questions....
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Old 09-07-2010, 02:40 AM   #5 (permalink)
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not nowing how much load/force snow puts on a roof, as its about likely to snow here as it is rain beer.......

I would go 24 inch center. this will make installation easy as you can reach and stand on the next truss going in. make sure you screw your purlins or roof batterns down I'd use 2, 3-4inch 14g screws on each join/end and then stagger each single intermedately so you dont screw in the center as your roof screws will go in a straight line in the center of yoru 2x4...

putting your purlins/roof batterns at 24 also will help with your snow load and also help working platform during construction as it with the trusses only allow a 20 x 20 inch space to fall through...

will you ply/osb the entire roof before purlins? building paper/wrap/felt?

dont forget your bottom cord ties/binders...normaly spaced no more than 10 feet apart and we try and push them tight into the corner where the web meets the bottom cord

what shape roof is it? hip/gable/gambrel/dutch gable???

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Old 09-07-2010, 07:30 AM   #6 (permalink)
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My pole barn is 30x48 and the trusses are at 48". Pitch appears 6/12

Purlins appear closer than 24".

My annual snow fall is 6+ feet.

I do heat it in the winter when I am working, so lots of melt and run off, so true snow load is less that, somewhere less than 2'.

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