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Window in dormer will not cut

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    Window in dormer will not cut

    Hello I am creating two dormers. For some reason the results I am getting are very different.
    In the left one I have already used dormer opening tool. In the right I have yet to do this.
    However, problem is that while on the right the window I drop in cuts a hole so that it is properly hosted but on the left the hole is not cut. I get error message:

    Can’t cut instance of 610 x 1220mm window out of wall.
    I thought I wouldonly get this error message if I was dropping window into a void or something like a door but clearly this is not the case.
    If you look at image you can see: a window embedded in a wall without cutting an opening!!????
    What is going wrong?
    Attached Files

    Can you share your rvt file, so we can troubleshoot?


      Stupid question - are they the same window family? From your image it looks like two different families, one possibly has a masking region in it.
      Revit for newbies - A starting point for RFO

      BEER: Better, Efficient, Elegant, Repeatable.


        OK here is file and thanks for any input you can give.
        I would also be grateful if you could answer other questions such as:
        If you look at right hand dormer in 16 05 17 Dormer problem. jpg you can see another problem I am having.
        I am trying to join small flat roof over dormer using join/unjoin roof tool but get error message:
        Part of the roof to be joined misses the target face.

        I am not sure why this is because flat roof clearly overlaps with 75 degrees Mansard roof.

        If it comes to that, why is junction of 2 planes of mansard roof so unsightly. Why does lower plane not run into upper plane smoothly?
        Attached Files


          I would make that mansard roof by extrusion. It will solve many (if not all) of the errors, and the dormers cutouts will work fine, including windows display.
          Last edited by PijPiwo; May 16, 2017, 06:16 PM.


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