We are working on checking the feasibility of retrofiting some heavy items onto the roof of a fairly large building in Southern CA. Building was built in 1979 and we have the structural plans. The roof framing plan calls out structural members none of us have heard of before. Plans are hand drawn, and the handwriting is kind of hard to read, so the members are either MPC 16 x 5 3/4 x 22 or MFC 16 x 5 3/4 x 22. The framing is a grid with what look like purlins at 8' oc and one big main center beam. All the same. Anyone have any idea what these are?
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