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    rated floor assembly thickness varies

    Wondering if anybody has a better way to do this.

    In the wood frame projects we're doing the floor has both a fire rating and an increased sound rating. The first is accommodated by a sheet of 5/8" GWB on metal furring attached directly to the bottom of the structure (which varies in depth across the building). The second is additional insulation above this layer.

    I would like to track as few things as possible. Modeling a 2" floor (plywood and gypcrete), a ceiling, and something (presumably a ceiling) for the insulation is two things more than I'd like (but I can get over that).

    Currently we're doing it all as a series of thick floors but we've also been ignoring the varying structural depths up until now and I'm starting to wonder if that's really the best approach. Perhaps a single 2" thick floor and a series of thickened ceilings (ideally automatic rather than sketch) would be a better approach. The downside to the ceiling is that I now need to manage it's height above the floor but perhaps, all told, that's less work than potentially hundreds of manually placed floors.

    Thoughts?
    Greg McDowell Jr
    about.me/GMcDowellJr

    #2
    Much like the previous wall discussions, I would model the plywood gypcrete as a floor (maybe a roof is better?). Then model the furring and gypsum board as a ceiling. Assuming the structure is a link? I'd leave insulation as annotation unless you need to quantify it.
    Chris Heinaranta | Architectural Technologist

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      #3
      I tried including the ceiling assembly in my floors a while back and it was a huge pain in the ass down-stream. It makes total sense from the perspective of an assembly (e.g. UL L501) and makes it easy to propagate the rated ceiling everywhere but I found it tough to deal with overall. The big issue I've run into with it comes down to multi-unit buildings (hotels, apartments) where the unit is a group that ideally contains the ceiling but the floor-to-floor heights vary across the building, or as you mentioned, the floor depth changes - meaning multiple groups are required.
      Revit for newbies - A starting point for RFO


      chad
      BEER: Better, Efficient, Elegant, Repeatable.

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