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Thread: Complicated roof

  1. #1
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    Complicated roof

    Hi,
    I am new to Revit and i'm struggling to draw a difficult roof.
    The ridge and eaves are both level. One wall is straight and the other wall tapers as shown in the photograph.
    Because the walls aren't parallel the roof pitch appears to change to keep the ridge and soffit level.
    Please can someone explain how to draw this roof?
    Many thanks
    Attached Thumbnails Attached Thumbnails Complicated roof-img_2115.jpg  

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    Forum Co-Founder Alfredo Medina's Avatar
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    Welcome to Revitforum.

    Is it something like this? A or B? I am not sure if the wall on the right side is in two segments or in one. Both of these examples have all eaves at the same elevation, and the ridge is horizontal. Anyway, let me know which of these two options is this case. It´s difficult to do with Roof by Footprint or with roof with modified points. These were done with roof by face.

    Attached Thumbnails Attached Thumbnails Complicated roof-2019-01-05_17-35-25.jpg  
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    Member tuekappel's Avatar
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    Hi Alfredo
    I'll try not to sidetrack the dicussion here, so please ignore me if you will
    -Just curious; In case A, the coloured surface would be a hyperbolic parabeloid (non-developable) surface rather than a flat surface, correct?


    Because, you know, sometimes in real life we have to build these buildings, and the bricklayer will have to "stretch" the roof tiling in this one...-it's almost visible in the original photo.
    Attached Thumbnails Attached Thumbnails Complicated roof-2.jpg  
    Last edited by tuekappel; January 6th, 2019 at 07:08 AM.

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    Member mjajansen's Avatar
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    In the picture, the left side of the roof is also twisted (the angle in the middle is different than at the front of the building) , so it will be difficult to model this with the roof rool.
    I would make a mass and use that for a roof.
    Last edited by mjajansen; January 6th, 2019 at 08:20 AM.

  5. #5
    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by tuekappel View Post
    Hi Alfredo
    I'll try not to sidetrack the discussion here, so please ignore me if you will
    -Just curious; In case A, the coloured surface would be a hyperbolic parabeloid (non-developable) surface rather than a flat surface, correct?
    Because, you know, sometimes in real life we have to build these buildings, and the bricklayer will have to "stretch" the roof tiling in this one...-it's almost visible in the original photo.
    Hi, Tuekappel, yes, that's correct. That portion that you painted orange is not flat. If I try to use the "Set" tool on that area, Revit does not find a plane, just highlights individual lines from the model surface pattern, and if I use the slope tool, the value of the slope changes slightly all over the surface as I hover the mouse around it. Same happens with the surface on the right side in case B. I think the photograph is like case A. I notice in the photograph that the roofers started to adjust the tiles to that change of direction starting from that "line" that divides the two portions of the roof. Also, the gutter and the soffit have a joint at that point. Interesting.
    Last edited by Alfredo Medina; January 6th, 2019 at 12:55 PM.
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    Hi alfredo,

    Thankyou for replying.
    The roof is like the one tuekappel has highlighted orange. Can you explain how you would draw this please?
    I am using Revit LT and im not sure if drawing roof by face is an option.
    I appreciate the help.

  7. #7
    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by Madmay View Post
    ... Can you explain how you would draw this please?
    I am using Revit LT and im not sure if drawing roof by face is an option.
    ....
    Hello, I used In-place mass (points, surfaces, create form), and then Roof by face. I can explain how, but you're right: Revit LT is missing those features. I just checked the chart that compares both versions.

    Hmmm.. In this case, I think the roof would have to be modeled using Revit, and then opened with Revit LT, or copy-pasted to a Revit LT file, or linked into Revit LT. I might be wrong because I don't have Revit LT here to test what I'm thinking.

    Attached Thumbnails Attached Thumbnails Complicated roof-2019-01-07_7-05-48.jpg  
    Last edited by Alfredo Medina; January 7th, 2019 at 11:18 AM.
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    Moderator cellophane's Avatar
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    it is annoying to have to do, but in lieu of shape editing / massing you can make that from separate roof pieces in a pinch.

  9. #9
    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by cellophane View Post
    it is annoying to have to do, but in lieu of shape editing / massing you can make that from separate roof pieces in a pinch.
    The problem is how to do that orange part without those tools.

  10. #10
    Mr. Revit OpEd
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    Is Roof by Face an option with LT? I Don't have LT. If yes, then create the surface with AutoCAD or Sketch Up and import that to create a roof by face?

    I'd be inclined to just use a Roof by footprint and accept the subtly of the difference between actual roof and the drawing. The OP doesn't say how the scope of their project affects the roof. If it is an existing building/roof it may not be altered by the scope? If so, an approximation of the roof should be sufficent?

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