An open web steel bar joist spans between structural supports at grid A and grid B with a sloped top chord. The joist depth measures 36 inches at the higher support on grid B and tapers to a depth of 28 inches at the support on grid A. Grid lines A and B mark the vertical support axes at each end of the joist span. Designated joist marks include J3, J4, J10, J11, and J12.
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