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UK Roof Eaves

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    #1

    UK Roof Eaves

    Could anyone point me in the direction of how I could model this type of roof please.

    The 3 particular features are:
    * The eaves sweep up a little.
    * The eye-drop roof over the dormer window.
    * One side of the roof has a lower eaves / soffit than the opposite side

    Many thanks.
    Roof Eaves 1.JPG Roof Eaves 3.JPG
    Roof Eaves 2.JPG Roof Eaves 4.JPG
    Tags: None
    #2
    First instinct would be to draw the outline and start playing around with shape editing the Roof.

    THe dormer I would approach as a seperate roof/element.

    Comment

      #3
      * The eaves sweep up a little.
      Basically it's an "inverted" mansard roof. I would build this from two roofs. One for the bottom slope, and one for the top, both of them by footprint. For the bottom roof use the cutoff level and cutoff offset parameters to stop the roof at the elevation of the slope change. Move the inner roof to this cutoff level.

      * The eye-drop roof over the dormer window.
      No nice solution, I can only think of an in-place model. Roof by extrusion doesn't work on slanted ref planes.

      Or you can build it into the roof window family.

      Or build as mass and roof by face. This is also true for the other two problems, maybe build the whole roof as a mass, than use roof by face.

      * One side of the roof has a lower eaves / soffit than the opposite side
      Use the 'offset from roof base' parameters of the roof's sketch lines.
      Last edited by infeeeee; February 21, 2020, 12:31 PM.

      Comment

        #4
        Here is a little bit on the Combination Roof (I've always heard it called a Witches Hat fwiw)

        https://revitforum.org/showthread.ph...roofs-in-revit
        Revit for newbies - A starting point for RFO

        chad
        BEER: Better, Efficient, Elegant, Repeatable.

        Comment

          #5
          Originally posted by cellophane View Post
          Here is a little bit on the Combination Roof (I've always heard it called a Witches Hat fwiw)
          https://revitforum.org/showthread.ph...roofs-in-revit
          Originally posted by infeeeee View Post
          Basically it's an "inverted" mansard roof. I would build this from two roofs. One for the bottom slope, and one for the top, both of them by footprint. For the bottom roof use the cutoff level and cutoff offset parameters to stop the roof at the elevation of the slope change. Move the inner roof to this cutoff level.
          Hi Chad & Infeeeee,

          That's been great, just what I need for the client at this stage (and at 1:100 scale).

          Revit WitchHat Roof.JPG
          Last edited by Damo; February 28, 2020, 01:35 PM.

          Comment

            #6
            Originally posted by infeeeee View Post
            No nice solution, I can only think of an in-place model. Roof by extrusion doesn't work on slanted ref planes.

            Or you can build it into the roof window family.

            Or build as mass and roof by face. This is also true for the other two problems, maybe build the whole roof as a mass, than use roof by face.
            Tried a few solutions, as you say none were 100% satisfactory. I made a roof by extrusion and tried/hoped that I could tilt it once built (by rotating it in section), but nope.

            Eventually I made an In-Place Component and used a Solid Blend.

            Used Aaron's tip for applying materials 'within' the model, as it's not possible to paint the roof tile once complete.

            There are a few anomalies, (like the roof tile is wrapped over the top, so right-way up on the east elevation and upside down on the west elevation, but it's not noticeable at small scale), but it's OK for now.
            Revit Eyebrow Dormer Window.JPG

            Comment

              #7
              If you need the roof to actually curve outwards instead of just a different slope, you have to model separate Roof By Extrusion elements for each face of the roof, and use the vertical cut tool that's part of the Roof By Extrusion function, to trim each piece back to align with the hip edges. It's quite time consuming and tedious.

              A Roof By Sweep tool would be nice to have.

              Comment

                #8
                I feel for you on this Damo - one of my first 3D modelled house designs nearly 20 years ago featured an eye-brow dormer - which I modelled in Nemetschek's Allplan.

                Really interesting to see a Revit approach here, thanks. I've got a house scheme coming up with 'sprocketed' eaves (I think they are called) similar to your roof edges.

                I've read that builders back in the day (early 20th C?) hated architects adding these sort of flared-edge roof details
                William Sutherland rias riba
                WS Architecture Ltd

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