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1/23/2012 10:38:20 AM | | | superJMuser
433 Posts Joined 08/19/2009www.revitinfo.comEntry Type: Issue Category: Building Elements Subcategory: Floors | Floors as Roofs
So I am working on a project where we have decided to model the roof as a floor, so that we can get the metal deck profiles in Revit automatically...a stupid limitation on the part of autodesk, but we can work around it by just using a floor.
However, in order to get the floor to do what I wanted it to do, I had used a negative slope on one side (essentially so I could set the ridge height and let it slope down from there).
This worked great until I started placing a floor hosted skylight family. It placed fine, but would not allow me to copy it. I got the an error basically saying it couldn't find the host, so it was deleted.
I haven't been able to see a lot of consistency in the error, as I have another roof that is set up similiarly. The difference is, this roof only has 4 sides/edges, while the one with the error had 6 edges.
I was able to fix the problem by changes the slope side and also changing the slope from positive to negative.
Hope this helps someone out there. ____________________ |  | | |
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1/23/2012 10:57:10 AM | | R. Robert Bell
17 Posts
Joined 04/20/2010 | Re: Floors as Roofs
In Response To: superJMuser
While your information may help others if they take your approach, I must say that I hope no one else does take your approach. I shudder to think of what the downstream ramifications would be of using floor elements as a roof. How will the MEP consultants be affected? How about energy calculations?
I would prefer to admit that the software cannot do "something" with the roof elements as-is and just live with it rather than introduce a host of unknown issues due to taking an unsupported route. _______________
R. Robert Bell |
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1/23/2012 11:07:45 AM | | superJMuser
433 Posts
Joined 08/19/2009 | Re: Floors as Roofs
In Response To: R. Robert Bell
Hey Robert, those are good comments. I have talked to a number of structural engineers that are already using floors for their structural roof element. Also, most MEP equipment that I am aware of is face based anyway (at least the consultants we use).
All that said, I will keep everyone posted on how it goes. Thanks for the comments. _______________
superJMuser |
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1/23/2012 11:14:23 AM | | tib
1 Posts
Joined 01/23/2012 | Re: Floors as Roofs
In Response To: superJMuser
Using Floors for Roof is the only way to go at this time. I can attached steel framing to the metal deck (floor) and if the elevation or slope changes then the framing moves with the deck. I cannot attach steel framing to a roof element. |
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1/23/2012 12:08:12 PM | | superJMuser
433 Posts
Joined 08/19/2009 | Re: Floors as Roofs
In Response To: tib
This is a good thought. I am curious how it will affect MEP. We are doing a combined Structural/Architectural file using Revit server, and we are going to show the structural deck as a floor element that has the roof insulation and membrane on top of the same floor element in Revit. This way, our skylights will cut all of the objects at once and it's easier to coordinate...but again, I don't know what is going to happen with MEP. I am sending them an updated Model today, so we shall see! _______________
superJMuser |
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3/2/2012 3:15:18 PM | | superJMuser
433 Posts
Joined 08/19/2009 | Re: Floors as Roofs
In Response To: R. Robert Bell
I thought I'd follow up on this issue. Floors as roofs does NOT work well with Autodesk Green Building Studio. As a matter of fact, I was unable to get the model to read into Green Building Studio when I tried, and I am almost sure the reason was due to the roofs being modeled as floors.
That said, other Analysis software seems fine with it, like IES Virtual Environment, which I have tried and been successful importing the gbxml file. The reason here, I believe, is that IES runs an "optimization" on the gbxml file before it creates the geometry so I assume during the parsing of the file from Revit, it understands that the horizontal face with the lowest elevation is a floor, and the one with the higher elevation is a roof (assuming there is no adjacency to a room above it, in which case it would be a floor).
Hope all that makes sense. _______________
superJMuser |
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