Is there a reason why its not possible to map to a floor revit category? only Roof seem to be available
Welcome to the forums @Fherbere !! Thank you for joining.
Regarding floors: that feature is not complete. At the moment you can’t assign faces to be floors or ceilings. We do have those on our backlog to address in a future release.
Thanks for the update @Ben …i imagine the floor category is at the Top of your backlog 
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@Fherbere
FYI, one of our developers @chris_evolvelab got some things working with floors last week - it’s not released yet but here’s a quick preview GIF:
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The Helix release 2.2.5 now supports floors!!:
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