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Old 06-16-2011, 06:28 AM   #1
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100'x40' house


What should the oc spacing be for the trusses. I was thinking 24". Also what size sheeting on the roof 1/2" or 5/8". All opinions are appreciated.
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Dustin

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Old 06-16-2011, 06:37 AM   #2
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100'x40' house


Not enough info, depends on a number of things. I doubt you would have a 40' unsupported truss. But usually 24".

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Old 06-16-2011, 07:33 AM   #3
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100'x40' house


It is a 60x40 house with a attached 40x40 garage. And yes they will be supported with 2x6s. I was just wondering what spacing should use because it's a long building.
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Old 06-16-2011, 11:14 AM   #4
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100'x40' house


Whether you're going to use 1/2 or 5/8 sheathing - have them use "clips",
between the trusses.
If you can - plywood sheathing.

rossfingal
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Old 06-16-2011, 01:42 PM   #5
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100'x40' house


Space 24" on center and use 5/8" apa rated sheathing. Max span depends on pitch, member size, and loading. My alpine truss span table shows a 2x4 common truss with a 3/12 pitch can span 40' supporting a total load of 40 psf.
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Old 06-16-2011, 04:39 PM   #6
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100'x40' house


Above advice on the span it right. See your truss guy/gal. Trusses are usually 24" OC, but they don't have to be. 2x6 studs are likely OK, but it depends on your snow/wind loads and ceiling height. My trusses will be 2x4 and 2x6, 24" OC, span 42', with a 5:12 slope. I would never use less than 5/8" ply on the roof, and clips, as mentioned. I am not a fan of OSB anywhere; it you get a roof leak, it may well turn to "oatmeal" (quoted from Martin Holaday on greenbuildingadvisor.com). I would have said "sh**" but that is too rude for some forums. Make sure your foundation is skookum, too; that span could generate a significant load.

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