I got a client with a 1960s sheer front office building.  He wants to check out the roof-rigged window washing track, which he says is keyed into the building structurals.  He wants me to find drawings which document said condition.  He already has a set of original structurals which make no mention of such a system - leading me to the suspicion that (since I have never seen mention of such rigs on original structural drawings in 1960s buildings) such rigs are after-market retrofits - which strikes me as rather weird, since how else were they planning on washing the windows.

Any opinions out there, as to the circumstances of vending, designing and installing such systems, especially vis a vis the original engineering design?

Christopher 

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