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45° and 50° inclinded roof with Two Cut - Square and a whole lot of issues

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    45° and 50° inclinded roof with Two Cut - Square and a whole lot of issues

    Hi guys,

    I'm creating a roof on my solid wooden house (CLT structure).
    The first thing to know is that the roof is also solid wood of 9cm thick and 16cm insulation on top.
    The walls to which the inclined roof is attaching to is 20cm thick solid wood.
    We don't overlay the roof on these walls but we make a cut in the walls so the roof can simply fall in to place in the wall as shown below:
    CLT roof to CTL Wall.png
    Roof selected in blue for better view.

    Now this works all fine untill the next step.
    We have a roof with the frontside and backside 45° slope.
    Left side 50° slope.
    If I create this roof with similar options as above, the difference in the roof slopes cuts off a slight angle of my roof.
    Due tp the roof not having the same thickness, a different angle of a solid structure goes lower or higher as the other.
    Bit hard to visualize without a 3D model but this is the result:
    CLT roof 45D to 50D.png
    Now this cut should not happen.
    Because when I attach the wall to this roof, they will later also have the inverse of this cut in the wall.
    Later I want to send these walls and roofs to production and they will cut of a slight section of my roof (which is extra work so extra costs) and that slight section will not be removed in my walls so later it won't fit.
    I currently have half solutions with manual reveals in the wall and adding the section manually back on my roof with a Fascia,
    but all these are alot of manual work and I don't know if this will be correct later if we use AgaCAD to send the 3D wall models to production.

    Next big problem is the Two Cut - Square rafter cut.
    We use these to get the roof with a normal looking thickness and not vertically cut like the Plumb Cut.
    Problem is, my front wall of my building has a few corners in it.
    When I make the roof, the left and right side of the similar roof react different:
    CLT roof left to right Two Cut Square.png
    Left side creates a weird corner due to the footprint not all in 1 line.
    Combined with the Two Cut Square rafter cut.
    Detail from another side:
    CLT roof left detail.png

    The right side then again has the different problem that the cut looks better but my Two Cut Square rafter cut is gone where it cuts.
    It's again a normal vertical cut as you would have with a Plumb Cut.
    2 different renders with the same footprint, same roof and both wrong.

    And then last but not least.
    If I use the Two Cut Square rafter cut, the size A in the footprint shown below can't be too small.
    Rafter cut footprint size.png
    If it's too small it can't be cut correctly and it won't create the footprint and the roof.
    However, we have buildings with this section A only being 10cm or even less.

    I've tried many things and contacted several more experienced persons with Revit to get this fixed but currently without good results.
    Hope anybody can give me some light in the tunnel to get this the way we want so we can get this in production.

    Best regards.
    Mitch Verelst

    #2
    You might find more accurate, though tedious, results if you approach each roof face individually. The roof in the image is made up off individual roofs for each face. The sketch for each roof has to be adjusted to clean up with adjacent faces as well as moved (up/over) so it overlaps the wall the way you've described.

    The wall roof relationship you're using for this design is not one that Revit is designed to create. It assumes either full bearing on the wall's top plate (truss) or a rafter tail condition where the rafter is cut to bear on the top plate fully.

    Attached a mockup the images came from...
    Attached Files
    Last edited by Steve_Stafford; December 16, 2019, 05:17 PM.

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      #3
      Hi Steve,

      Thanks so much, Ive been able to complete my task now.
      Still alot to do with all the different panels but workable.
      Bit sad that it s not a roof relationship standard in Revit but I guess we can't have it all.
      Thanks alot!

      Mitch

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