Interior Dimension On A 28' Roof Truss? - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 07-04-2012, 05:18 PM   #1
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Interior dimension on a 28' roof truss?

Hi, I'm new here and have dumb question that Google is not answering for me.

I'm trying to design my own home, and I simply want to know what interior dimension I can plan to match up with a given truss size. Thus, can I draw a blueprint with a 28' interior dimension (not counting the exterior walls) with a 28' roof truss? Or would a 28' roof truss yield something less than 28' in usable interior space?

My wife wants a brick exterior, and we want to frame up inside the brick with typical pine frame construction, if that matters. I'd been assuming the lumber would be load-bearing rather than the brick, but I guess I'd also appreciate feedback on that point.

Thanks for any info!,
Eric B.
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Old 07-04-2012, 05:42 PM   #2
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You need to get the plans for an actual 28 foot truss, as there are numerous styles of trusses, and the specific attachment point for any given truss will be different from one manufacturer to another. Many truss manufacturers have on line drawings of their trusses, often in CAD format, so you can add them directly to your plans.
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Old 07-04-2012, 07:41 PM   #3
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Any trusses I have used are measured to the outside of the building in regular 2x6 or 2x4 wall construction.
So with the 2x6 wall (5.5") plus 7/16 OSB plus 1/2" drywall on each side is 6&7/16 times 2 sides is 12&7/8" less then the outside.
28' - 12&7/8" = 26' 11&1/8"
Basically you lose 13", some put the edge of the plates in line with the outside of the truss and gain the 7/16" on both sides as the exterior sheeting is outside the rafter.
Brick cladding would go outside the trusses in my application of them.
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Old 07-05-2012, 10:09 AM   #4
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Don't the truss suppliers make the truss to fit your plans or are you trying to use some standard size truss that is available to save money? Call the truss supplier in your region.
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Old 07-06-2012, 04:16 PM   #5
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eric: if i may suggest, i would not recommend you design your own house. given the question you asked, it seems you'd be better to "design" what you would like, then take it to someone who can put that into practice. i bet it will be the best money you spend on the house. good luck.
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