Measure from the center of the joist to the finished height of the ceiling and add 6" This will give you 3" extra to tie the wire around the fastener and 3" inches below the ceiling height for tying to the main runner On commercial projects I usually add 1' at the top and 1' below the ceiling heightIn a ceiling assembly UChannel is suspended from the overhead structure using hanger wire Drywall furring channel is commonly clipped with metal furring channel clips or wiretied perpendicular to the underside of the UChannel at appropriateCeiling HangerShelves hang from joists in garage, basement or storage shed
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