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rated floor assembly thickness varies

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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.

    Greg McDowell Jr

    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


      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.
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