Yes, I think they are high/low steel depths. The roof is flat but the plan shows a hipped taper which would make sense, if the 48.5 LH is level at the bottom of the hip and a 56.0/48.5 LH goes up to the ridge. Thanks.
I have a roof plan for a building constructed circa 2005 which denotes the LH-series longspan joists as the following:
48.5 LH
50.0/48.5 LH
51.5/48.5 LH
53.0/48.5 LH
54.5/48.5 LH
56.0/48.5 LH
This is obviously different from the LH joist notation that I am used to seeing (e.g. 48LH15). Is...