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  1. cdc1

    What is the capacity of my ceiling joists?

    I have an 1890 historic building that I have to update the ceiling with 2 layers of 5/8" drywall. I have 2X12s' spanning 24 feet on 16" centers. The ceiling is covered with 1/2" toungue and groove pine, the floor above is covered with 3/4" oak flooring. I estimate the...

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