I am trying to develop the capacity of the roof joists of an existing building located in Oregon.  I have the original construction documents dated 1962, and they specify the joists as “18LA 10 STL JOISTS @ 8’-0” O.C.”  They span 35’-0”.  I know these are not in production anymore, but anyone has access to old design catalogs that could provide their capacity it would be really helpful.

My research to date shows:  In 1966 LJ- Series replaced the LA- Series, then in 1978 there was an elimination of J-, LJ-, and DLJ- Series and Introduction of Joist Girders.  

I have already attempted to contact Vulcraft, but they are not proving to be very prompt in replying.  I figured I would try here also.