Posted by TonyIN on October 11, 2009 at 15:17:38 from (72.49.225.36):
In Reply to: pole barn trusses posted by 7lazy77 on October 11, 2009 at 11:09:37:
I"ll second what Rod and MSD say. It is very rare (at least here in the midwest) to find residential roof trusses at any spacing other than 24" o.c. We may occasionally see them at 19.2" or 16". Odds are if they are residential, they were sized for drywall on the bottom chord, 1/2" plywood on the top chord, and asphalt shingles. So... drywall really doesn"t like to span further than 24" especially on a ceiling, which further reinforces the notion they were setup for 24" spacing. Same with the 1/2" plywood sheathing and normal roof loading. See also if the builder has the truss shop drawings. They should have been shipped with the trusses (around here in Southeast IN, you have to have these on site for your inspections). These drawings will not only give you load info and spacing, but also bracing info. Pay close attention to both erection bracing and final bracing. I"ve seen a few collapse during construction. The plywood roof sheathing is factored into the design of the trusses for lateral reasons also. Last, be careful hanging anything or loading the bottom of these without additional support. Large point loads (splitting a tractor...) may overstree the truss. There you go. More than any of us really wanted to know.
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