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Forums >> Revit Building >> Technical Support >> Join 2 roofs, like joining 2 walls

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Fri, Nov 5, 2010 at 8:45:58 AM | Join 2 roofs, like joining 2 walls

#1

JeroentjeM


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Hello,

 we join our walls, so that if a window is placed in the inner wall, it also cuts the outer wall. Works like a charm.

My thought was, to do the same with roofs. We use 2 rooflayers, 1 for constructional, 1 for the ceramic tiles. (paste roof to face, using masses) I would like roof windows to cut throught both layers, but I can't seem to join these 2 roof layers, like I do with walls?

Thanks!



Edited on: Fri, Nov 5, 2010 at 4:07:02 AM

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Fri, Nov 5, 2010 at 12:20:21 PM | Join 2 roofs, like joining 2 walls

#2

WWHub


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Joined: Tue, May 16, 2006
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I have never done this so this is only a guess. 

It may be because you are using masses to begin with.  If you don't have a special reason for using a mass (shape), then I would use the standard roof creation tools.  You can test this for us by creating a simple, square, roof, copying it up or down the roof thickness and changing the material in the copy.  now host your object and join the roofs.

 

Let us know what happens.


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Tue, Nov 9, 2010 at 7:36:03 AM | Join 2 roofs, like joining 2 walls

#3

JeroentjeM


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Hello,

tried it this way, this also does not work. It seems that roofs can't be joined like walls. The reason to use masses for our roofs, is that Revit does not offer any other way to meet the requirements of our roof supplier.

Our roofs are fitted on a wooden beam, mounted on the concrete floor. This beam has a side-offset of 35mm. This gives the roof a certain vertical offset. In example with a shielded roof, with different angles, revit thinks that the vertical offset is the same, all way round. But this is not. With roof by footprint, I should make my footprint a little bigger to get the right values, but this would be guessing. Or using a excel or something to calculate these values.

Long story, but anyway, I've tried a lot of different ways, but none of the standard Revit solutions seems to be the right one.


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Tue, Nov 9, 2010 at 9:37:43 AM | Join 2 roofs, like joining 2 walls

#4

Kronny


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Modern roofs are frequently erected using prefabricated roof trusses.

These are built off-site in a controlled environment and delivered ready to be positioned on the roof.


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Tue, Nov 9, 2010 at 10:15:58 AM | Join 2 roofs, like joining 2 walls

#5

JeroentjeM


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Exactly. we use prefabricated roofs, which should be positioned by the terms of the supplier.

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Tue, Nov 9, 2010 at 1:41:41 PM | Join 2 roofs, like joining 2 walls

#6

WWHub


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I just did a test project using regular roofs and a skylight.  The roofs joined correctly but the opening did not cut the connected roof.  I looked at the skylight family and I see they used an opening cut in the family and that will not cut the joined roof.

 

Your solution may have to be a hosted void family on the joined roof.  I would simply make this a face-based void which will cut its host.  


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Wed, Nov 10, 2010 at 7:27:48 AM | Join 2 roofs, like joining 2 walls

#7

JeroentjeM


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Hello WWhub,

thanks for the efforts! I too did these tests, but also replacing the opening cut with a void, which is big enough for both roofs, does not do the trick.

For this reason we just decided to add the second layer of ceramic tiles into the base roof, so only 1 roof needs to be drawn. This used to have some disadvantages, because we would have to cut our roof to make it look as if the second layer (roof tiles) are extended into the gutter. But it looks like we need to cut the rafter ourselves anyway, so this is no problem any more.

Because we would like our roof ending "two cut square" but this does not seem to work for shielded roof types with different angles. So cutting by hand would be the answer. Not ideal, but I've read many posts, and it seems that roofs is the least flexible within Revit...?

 Thanks for all the help so far.

Jeroen


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Wed, Nov 10, 2010 at 1:23:34 PM | Join 2 roofs, like joining 2 walls

#8

WWHub


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I knew that the void in the family would not work so I was not suggesting putting the void in the family but instead adding it directly to the model.

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