Purlin Design

Question: 

Do you have information on purlin grades and species to meet 50 psf top chord live load using 2x4s on edge 24 in. O.C. over trusses at 6 ft. O.C.?

Answer: 

SBCA 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.

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