Forums >> Revit Building >> Technical Support >> Roof: just can't get it right!

sroreilly

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Joined: Mon, Jan 17, 2011
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Version R2011,

 I've tried many different ways to get my roof right, but I've officially given up! I'm having two issues, and I'm hoping that some genius out there will be able to tell me how/why I'm having such problems. I just can't see how it can be THIS complex! 

(So, I've attached some pics of my roof.)

Problem 1: the one roof that I have between the garage & the main roof I cannot get to slope/attach to the main roof correctly. It hangs in outer space above the main roof. How can I get this down? I've tried moving the  boundary lines to many different positions, tried following (what I thought were) reasonable sketch lines, but still can't get it correct. Also, I am then left with a dead space for all the snow (or water) to pile up.... Not good. Not correct. 

Problem 2: And this is not the first time..... It seems I have to fiddle with the boundary lines to take excess roof out from below a joining roof. I think I read that you can "cut geometry" in this situation. Cut geometry doesn't work for the roof.  Or, cut a hole in the one roof. I tried that too, but that becomes so messy, and takes a very long time through trial & error to get it "close". I'm sure that there is a better way....

 I've watched CadClips.... I keep looking for more tutorials... there used to be a good one on 'ask Amy', but I can't find it anymore.  

Well, I'm hoping for some suggestions....

Thanks in advance....

S. 

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itsmyalterego

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your picture doesn't seem to have attached. And your description seems to largely reference it, so I can't offer any advice.  But:  what you're trying to do is probably quite easy with the right tools, and there are several ways to successfully build roofs. 

Boundaries lines and toggled slopes can be a bit finicky, so, I feel you there. 

But here's something I have the displeasure of attempting to as-built.  It's accurate, and the yellow-trimmed roof is all one piece.  So, have hope!  complex geometry is possible.  I ended up using control points.

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sroreilly

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Ah, well drat. 

I'm trying to upload again...  

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mbsteve

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From the vegaries of the underlieing walls and in particular the wall tops do not seem to coincide with a proper structure. It is the underlieing structure that is at fault not the way that Revit creates the roof. Edit the walls with out the roof and make them make sense, first.

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WWHub

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I agree with steve .... Revit will model only as good as you provide ... that area will not clean up - change your roof overhang or walls.

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sroreilly

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Thank you for your responses.

Sorry, but I'm confused. I don't quite understand what you are meaning about the walls, though. Some are at 10', some at 9'. The garage elevation is meant to be lower than the house. 

I'm wondering if you mean that my wall between the garage & the house need to be a different height? I can detach them all.... 

I am restricted as to the overhangs & the roof slopes (by the architect that designs the community). My boss wants the walls a certain height. 

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mbsteve

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I saw some irregularities in the walls, but you may indeed have to create separate roofs for the garage and the house and then cut them together.

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sroreilly

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Thank you for your responses.

Sorry, but I'm confused. I don't quite understand what you are meaning about the walls, though. Some are at 10', some at 9'. The garage elevation is meant to be lower than the house. 

I'm wondering if you mean that my wall between the garage & the house need to be a different height? I can detach them all.... 

I am restricted as to the overhangs & the roof slopes (by the architect that designs the community). My boss wants the walls a certain height. 

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sroreilly

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Thanks mbsteve:

I've attempted a few different ways.... I have a few different roofs here, and then have them joined. 

I still don't get what is meant by the irregularities in the walls. 

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itsmyalterego

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that many slopes would drive me absolutely nuts.  Again, I would turn off the slopes, which you must do before being given an option to define the roof with control points, like topo, and ridge lines. It's a little more difficult to be precise this way... but easier to get close to your desired geometry..

From the attached images I'm still having trouble seeing what you intend the roof to do.

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mbsteve

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Joined: Fri, Sep 22, 2006
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How is it that you expect to have a nice clean roof line when you have so many differing planes that you expect to pitch from. Use a few of the primary wall lines and then extend or cut back the walls to hit the roofs. The backward pitch of the roof ridge is because of non parallel lines I think. Hard to know exactly what is going on not being the modeler. Simplify the wall lines is the best way for me to explain. Remember you are going to either have trusses built to fit this roof or a pour carpenter is going to have to figure it out and then the roofer. Have you ever heard of the KISS principal. It needs to be employed here. The building will be complicated enough.

Hope this helps and I not trying to beat you up. Just think it through a little.

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Roof Phases

1

Gap in Roof

9

Roof Fascia Doesnt Render

1

Roof Edge Profile

8

Create Roof Family Object

6