Do you have information on purlin grades and species to meet 50 psf top chord live load using 2x4s on edge 24″ o.c. over trusses at 6 o.c.?
WTCA does not have any information on purlin sizing. Purlins are part of the permanent bracing system, and as such, a Building Designer responsibility. Contact the National Frame Builders Association (a trade association of post-frame building professionals) for more information on purlin requirements. Their contact information is: National Frame Builders Association (NFBA); 4840 W. 15th St., Ste. 1000; Lawrence, Kansas 66049; 785/843-2444; 785/843-7555 fax; www.postframe.
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