building trusses

Old 07-17-03, 07:21 PM
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Post building trusses

What are the measurements used to determine the size of a truss? I now it has to do with span, run, and rise but how are they all calculated together. I need help asap....
Old 07-17-03, 08:23 PM
bungalow jeff
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There is a bit of engineering involved. You can order pre-fab trusses from a manufacturer. The sales rep can help you choose the truss geometry and size fo r your span. Or you could hire and engineer to design them, but pre-fab trusses are more economical for standard construction.
Old 07-18-03, 03:11 AM
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Jeff is correct. Buy a prefab truss. You just tell them the pitch, and the span, and they sell you the truss. They are very cheap.
Now, just so you know, in order to calculate the truss strength, you would need calculus 303. Plus a couple books of shear, and load tables. so lets just skip to the meat of this deal. You cannot build a truss. You can build a rafter, but you cannot build a truss. Trusses can only be built in factories using very stringent powerful press's. You can buy a complete truss cheaper then you can buy the material to build a rafter the same size. Now, all rafters must be built to your local building codes and permit sections. Buy a prefab and save yourself alot of headaches. Good Luck

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