I have a 90x60 flat roof restaurant with a 40' span and (2) 25' spans. Since the ARCH is going with 3/4" plywood (instead of the customary 5/8"), is there a benefit to a 2'-8" c/c max. truss spacing, particularly for the long span or are there pitfalls? It seems like cutting down the pieces & parts will simplify the construction and produce some economy. For the short spans, is it inefficient to specify roof trusses at that length when TJI's @ 24" c/c max. may do the job better? Or can I delegate to the manufacturer/truss designer to elect which member ( joist type, depth & spacing ) to submit for these spans based on the loads given, including parapet drift? My intent is to detail the project with conventional "WOOD TRUSSES @ 2'-8" C/C MAX.", but enable the option for the Owner to purchase Red-Built metal web trusses, TJI's or otherwise, which I'd be able to approve. I appreciate any insight in preparing an efficient design for this type of roof. Thanks,
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