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    Roof Cutting At Intersection Problem

    hi all, I am a newbie for revit and the forum. Have been learning revit for around 2 weeks and having some fun.

    However problem arises, please have a look at the attachment pic. I have been trying to cut a intersect roof yesterday and got struck all day. :banghead:

    I was able to join the roofs by the join command, however there was no cutting at the intersections between the roofs at the main roof. I tried to create a solid as a roof component by model in place, place it underneath the main roof and cut it, but it didn't work at all. I also tried dormer command, but couldn't find a way to define all the cutting edges.

    Any advice are welcome....I would greatly appreciate if someone can enlighten me the best way to get the main roof cut. Thank you in advance
    Attached Files

    #2
    there is a few different ways to acheive what you are after, but try this one first
    Go to Architecture Tab
    Select Opening Vertical
    Select the roof to cut
    Sketch (or pick lines, my choice) the shape to cut out.
    All done
    Attached Files
    Mark Balsom

    If it ain't broke, fix it till it is.

    Comment


      #3
      Hi Mark, Thanks for your reply. I tried your method, however it created a problem.

      the underside of the opening were not flushed with the roof it intersects. (pls see the attached image), is there a way that they can meet seamlessly?

      thanks again.
      Attached Files

      Comment


        #4
        You have to pick the line that is formed where the top of the two roof planes intersect. It looks like you picked the intersection where the underside intersects.
        If you have wireframe turned on, turn it off, it gets a little confusing which line to pick.
        Attached Files
        Last edited by mark b; August 7, 2012, 10:04 AM.
        Mark Balsom

        If it ain't broke, fix it till it is.

        Comment


          #5
          Mark you are superb! It works beautifully... Massive thanks for your help.... have a good day!

          Comment


            #6
            I would have modelled the whole roof as one piece.

            However, ther is one option omitted from the suggestions above, which is much more 'Revit'.

            Dormer openings are often misunderstood (read rarely used) and work great in this type of instance.

            A Dormer (Home>Opening>Dormer) opening is formed between the main roof and the joining roof (I assume you use the 'join roof' tool) and any walls involved (if you were punching a traditional dormer in the miiddle of a roof) and will adjust if you move any geometry.

            1. Home>Opening>Dormer Opening
            2. Select roof to be cut (if memory serves)
            3. select cutting items (joined roofs & intersecting walls, in your case, just the roof)
            4. Click finish.

            Voila, the opening is cut and the intersection between the roofs is tidy (even if the roof pitches differ which doesn't happen with shaft/vertical openings) and if you modify your main roof or intersecting roof, the cut will update.

            2 cents
            Last edited by Tim West; August 8, 2012, 10:25 AM.
            I used to be high on life, until I realised it was cut with Morons.
            Combating ignorance daily through learning.

            Comment


              #7
              Originally posted by Tim West View Post
              I would have modelled the whole roof as one piece.

              However, ther is one option omitted from the suggestions above, which is much more 'Revit'.

              Dormer openings are often misunderstood (read rarely used) and work great in this type of instance.
              Tim, I agree with you on this one, but as the OP is a newbie to Revit and also said he had tried to use Dormer Tool already with no success, thought i would show him another option to get him on his way.
              Mark Balsom

              If it ain't broke, fix it till it is.

              Comment


                #8
                And here is another example of me reading questions thoroughly!!

                I learnt something new though, that you can have model lines on the roof plane to use to define the dormer opening!!
                I used to be high on life, until I realised it was cut with Morons.
                Combating ignorance daily through learning.

                Comment


                  #9
                  Hi Tim, Thanks for your input. Do you mind to show me the way to model the roof as one piece? First thing I tried was roof by footprint, but I was struggle to define the slopes. Especially the two small gable roofs. I would love to have similar roof model in one piece for my future modelling.

                  And also can you explain little more what do you mean by model lines on the roof plane to use to define the dormer opening???

                  Sorry if I am asking too much.... I just want to learn as much as I can.:crazy:

                  THankss. :beer:


                  roof plan attached for ref.
                  Attached Files

                  Comment


                    #10
                    Okay,

                    I'll start this post with a Grrrrarrrghfarrrrrrq!!

                    Revit did not act as expected (hardly surprising) and is stoopid!!

                    To create a valley with opposing slope arrows will not work! It will work if the slope arrows are half a degree rotated, but not 180 degrees opposite!!

                    If you were modelling this roof, you may be adding an internal box gutter in the valley, so to model this 'correctly' (and easier-ly) model in the gutter, which works fine.

                    Enough blah. Please see attached pics. Please note the small inset added to allow revit to accept opposing slope arrows (this is between the slope arrows that create the valley... and technically cheating...

                    Damn iOS, I will upload the images at work tomorrow... Biggest city in New Zealand, and I have been waiting 10 months for an aDSL connection!!
                    Last edited by Tim West; August 8, 2012, 10:24 AM.
                    I used to be high on life, until I realised it was cut with Morons.
                    Combating ignorance daily through learning.

                    Comment

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