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Forums >> Revit Building >> Technical Support >> Change in rafter thickness in roof

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Mon, Jan 4, 2010 at 5:04:09 AM | Change in rafter thickness in roof

#1

seeb


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Joined: Tue, Dec 29, 2009
14 Posts
2 Stars: 1 Votes


Hi,

I am working on a roof that slopes up to meet a curtain wall system and creates an overhang of 4 feet. The roof is timber frame and its thickness is continously 16", except for when it meets the curtain wall it is supposed to thin out to 6". I thought I could use the Rafter Cut option, under Instance Property, but the change in rafter thickness happens to the lower side of my sloped roof! Can you please help me to get around this problem.

I have attached an image I hope it helps

Thank you



Attached Images

70705_Housing_estate_in_Kolding-local.jpg

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Mon, Jan 4, 2010 at 10:48:39 AM | Change in rafter thickness in roof

#2

KingRevit


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Joined: Mon, Oct 15, 2007
321 Posts
4 Stars: 12 Votes


Have you tried selecting the roof adding a Split Line then using Modify Sub elements.

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Mon, Jan 4, 2010 at 4:00:15 PM | Change in rafter thickness in roof

#3

seeb


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Joined: Tue, Dec 29, 2009
14 Posts
2 Stars: 1 Votes


Yes, that option has just allowed for more flexibility of the roof plane, with the uniform thickness. I am trying to taper the roof at the edge. any ideas? Thanks

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Mon, Jan 4, 2010 at 6:57:32 PM | Change in rafter thickness in roof

#4

MARS1276


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Joined: Thu, Jan 24, 2008
193 Posts
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Try creating a profile to use as your roof sweep for that one side.  It could start at 16" and taper to the 6" at the 4 foot overhang.

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Mon, Jan 4, 2010 at 8:04:56 PM | Change in rafter thickness in roof

#5

seeb


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Joined: Tue, Dec 29, 2009
14 Posts
2 Stars: 1 Votes


 

I used Swept Blend tool and the geometry is working now but I have lost all the material layering ability of a normal roof (it seems I can only asign one material to the geometry). So does this mean I have to fake the section. 

I have attached the section

Thanks!



Attached Images

70749_Housing_estate_in_Kolding-local.jpg

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Wed, Jan 6, 2010 at 1:28:23 PM | Change in rafter thickness in roof

#6

MARS1276


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Joined: Thu, Jan 24, 2008
193 Posts
1 Stars: 1 Votes


If you are wanting to assign more than one material to your geometry used for your sweep, you might want to assign it the same material as your roof, but then use the paint feature to give the other parts a different look (I'm guessing you want the appearance of a facia?  Otherwise, yeah, might have to find a way to "fake it".  Filled Regions work well for that sorta thing... except I don't know how to make them parametric if there is such a way to do so.

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