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Old 08-31-2009, 09:30 PM   #1
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trusses For Addition

I'm adding on to my house. I have a 24' x 30' slab poured. I want to span 24' with trusses. What should I use to build the trusses? 2x4 or 2x6 or something bigger? Also, the bottom of the trusses (the joists), should I spilt the 24' into 3rds using 8' lumber or do it in 2 pieces using a 16 footer with a 8 footer?
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Old 08-31-2009, 10:01 PM   #2
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Originally Posted by 1967jsr View Post
What should I use to build the trusses?
I would suggest to use a qualified truss manufacturing company - who will do the proper engineering and construction and deliver them onsite ready for you to install. You will then have a properly built roof structure plus pass building inspection without issue.
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Old 08-31-2009, 11:04 PM   #3
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Ditto sheetz, When I did my addition it only cost me about $120.00 a truss 6/12 pitch 28' long with overhang, raised heel. Delivered to the house. It's not worth the hassel of building them, plus you have to make some kind of jig to make sure they are all perfectly the same. And also you might want to look at some of the designs they have available as far as bonus rooms built into the truss for attic storage or a scissor truss to give a cathedral look inside.
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Old 08-31-2009, 11:18 PM   #4
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The engineering on the home-made trusses that will inevitably be required by any heads-up building inspector will cost a lot. Enough to offset the cost of having a truss company fabricate (and engineer) them for you. It really is very inexpensive, and is a much much much better idea than trying to do it yourself without an understanding of the ways trusses manage the imposed loads.
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Old 09-01-2009, 06:40 AM   #5
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It was touched on above, but to make it a little more clear, a truss manufacturer will provide you with all the documentation you need about wind/snow loading, bracing and fastening requirements to satisfy your building inspector.
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