Difference between Purlins, Joists and beams.
Difference between Purlins, Joists and beams.
(OP)
I get really confused as these terms are used interchangeably. I know that joists are kind of beams that transfer loads to girders. But, are all beams transferring loads to girders joists? And, what exactly is a purlin. As far as my knowledge goes, it does the same job.
Thanks in advance!
Thanks in advance!






RE: Difference between Purlins, Joists and beams.
Purlins - Fairly small, repetitive members holding up deck directly. Always referring to roof members.
Joists - Same as Purlins but perhaps larger members with longer spans. Either roof or floor members.
Beams - Similar to joists but usually spaced further apart (5 to 14 feet). Either roof or floor but usually floor members.
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RE: Difference between Purlins, Joists and beams.
RE: Difference between Purlins, Joists and beams.
RE: Difference between Purlins, Joists and beams.
RE: Difference between Purlins, Joists and beams.
They weren't sure about Purlin, but they looked him up and apparently he wrote The Hedgehog and the Fox.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Difference between Purlins, Joists and beams.
RE: Difference between Purlins, Joists and beams.
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RE: Difference between Purlins, Joists and beams.
RE: Difference between Purlins, Joists and beams.
Rafters are sloping joists at the roof, that are parallel to the slope direction.
Mike McCann, PE, SE (WA)