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Steel Deck Cantilevers

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Title: Conewago Stationery

 

    Can anyone shed some light on the following note in SDI roof deck specs: "No permanent suspended loads are to be supported by the steel deck"? This note is in reference to a table showing the maximum recommended cantilevers for various types of deck. (See page 27 of this http://www.newmill.com/pdf/DeckDesignGuide.pdf deck catalog.) A section of the specs gives the loads that the cantilever is supposed to be able to support. Why shouldn't deck cantilevers support permanent loads? Should deck cantilevers only support light loads? What would be an acceptable load on a cantilever?
    I am looking at a case where 3" deck is cantilevering 3'-0". This is several inches shy of the recommended maximum cantilever length. The dead load the deck would support would be about 10 psf, with snow load under 35 psf.

Wesley C. Werner