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    #1

    Railing in a Model Group

    Hi all, I am using Revit 2022. I have a balcony which repeats over 20 floors. I'm modelling it partly with a floor, a generic model family to form some funky shaped cladding and then a railing to the edge. As it repeats 20 times I want to combine everything into a model group.

    I add the floor and my generic model family and it works absolutely fine. But as soon as I try to add my railing into the group, it comes up with the dreaded "Fix Groups - Group instances of the same type do not contain identical members". My railing isn't particularly complex, the path has curved corners but apart from that it's a pretty standard rail with a rectangular balustrade on top. If I draw the rail as a straight run of 100mm long, it adds to the group fine. But as soon as I model the path I want and add to group, computer says no!

    I've tried deleting all instances of the model group, I start from scratch by adding everything into a new group and as soon as I copy it up to the level above, I get "Fix Groups". I've also tried doing a model group which only has the railing in and it won't even do that. Can anybody suggest anything please? Is there a way that I can have a railing embedded within my generic model family? If I could incorporate it into the cladding family it should work OK but I don't want to have to model all of the posts individually. The standalone rail in the Revit project is perfect, it just refuses to add to the group 😬
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    #2
    Just checked and I get the same message when I add a curved corner to the railing in a group.
    It tells me 'different curve', interesting

    [edit] and not with all my railing type, so there is something in the railing type that causes this issue

    [edit] looks like when I add a handrail the issue occurs
    Last edited by Robin Deurloo; May 13, 2022, 10:42 AM.
    Company Website: www.deurloobm.nl
    Revit Ideas: Is this family Mirrored? | Approve warnings | Family Type parameter just those in the family
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      #3
      Originally posted by Robin Deurloo View Post
      Just checked and I get the same message when I add a curved corner to the railing in a group.
      It tells me 'different curve', interesting

      [edit] and not with all my railing type, so there is something in the railing type that causes this issue
      OK thanks. I did suspect that it would be something in the railing type but when I tried using the pre-loaded system railing types I still get the same message. All of the railings in my model give me a problem. So it's going to be difficult to try and pin down what is causing it

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        #4
        The issue occurs for me when I add a Handrail and disappears when I remove that again, so check that I'd say.
        Company Website: www.deurloobm.nl
        Revit Ideas: Is this family Mirrored? | Approve warnings | Family Type parameter just those in the family
        • Likes 1

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          #5
          Originally posted by Robin Deurloo View Post
          The issue occurs for me when I add a Handrail and disappears when I remove that again, so check that I'd say.
          Yes, you're right. Thanks!. I remove the top rail and it adds to the group, no problem. Not sure how I get around that as I need the top rail in there! 😂

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            #6
            from my test, adding a Rail Structure does not give any issues, but adding Handrail 1 or Handrail 2 does
            Company Website: www.deurloobm.nl
            Revit Ideas: Is this family Mirrored? | Approve warnings | Family Type parameter just those in the family
            • Likes 1

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              #7
              i never put railings in groups. i've found they get confused with which element they should be hosting to. maybe the last couple of revit versions behave better but i'm still in 2021.
              There are no stupid questions, only stupid people

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                #8
                I get the error if the railing is hosted to the level, but the issue disappears if I host it to the floor in the same group

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                  #9
                  Originally posted by LeChumpOfStultz View Post
                  I get the error if the railing is hosted to the level, but the issue disappears if I host it to the floor in the same group
                  I guess I was referring mostly to stairs, (but also balconies (floors)). Still not a pro with multi level stairs but haven't really had a chance to do them properly in the last few years.
                  There are no stupid questions, only stupid people

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                    #10
                    Originally posted by LeChumpOfStultz View Post
                    I get the error if the railing is hosted to the level, but the issue disappears if I host it to the floor in the same group
                    That would be consistent with Model Groups then -- keep the host in the group. Unhosted families work best though with Railings being a System Family that's not as clear.
                    Greg McDowell Jr
                    about.me/GMcDowellJr

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