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RainT (Structural) (OP)
3 Aug 05 7:23
Hello, this is my first time to design a wood,
can you help me.
The bldg is one story 8.6mX8.6m I am going to use wood truss. The question are, what is the maximum spacing of the truss I should use and what spacing of the purlins I use? the bldg will carry 30psf.

boo1 (Mechanical)
4 Aug 05 13:44
Typical wood trusses are set at 24" O.C.  What is your roof ing material and wind loads?
whyun (Structural)
4 Aug 05 17:33
Typical roof joist spacing, as boo1 suggests, is 24" o.c.  Other typical spacing is 16".  Standard sheet of plywood is 4'-0" x 8'-0".

To determine a reasonable spacing for the wood trusses, first select the typical joist you would like to use (say 2x4 or 2x6), determine a maximum span for the load condition, then use a even number feet that is less than the maximum span.

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