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1961 Steel Joist - LA Series

1961 Steel Joist - LA Series

1961 Steel Joist - LA Series

(OP)
I need to check an existing steel joist roof built in 1961 for loads due to some new HVAC equipment.  The joists are designated as 40LA18 and they span 68'-10".  An old thread (thread507-74306) was posted back in 2003, and it sounds like some of you have information on this series.

Thanks,
Jason

RE: 1961 Steel Joist - LA Series

According to the SJI 50 year Joist Digest, a 40LA18 has a uniform load capacity of 632 plf for a clear opening or net span of 69 feet.

Good luck!

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