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Forums >> Revit Building >> Technical Support >> eyebrow dormer
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Joined: Wed, May 23, 2007
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I am trying to create an eyebrow dormer. See the attached pdf. I can create the correct profile by extruding the roof but I can not figure out how to get this shape to slope up along the extrusion.
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You can create the roof by making an In-place family in the roof category and then using the blend extrusion. The family will have to include a void to trim it back to the roof.
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I agree with tim i think the only way to accomplish this is with a blend.
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I have never used a blend but I am not sure that it is necessary. This shape is very similar to a barrel vault except that it slopes upward along its centerline. I have attached a roof that I made by extrusion, which has the correct shape. This would be perfect if I could rotate it about the front edge so that the ridge was sloping up at 4:12. See attached.
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Do that like Tim123 said.....
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I do not know how to create an in place roof family. Can you point me in the right direction?
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I tried creating a mass (for the first time in R2010) but can not figure out how to extrude the form along the slope. Once created Revit will not allow it to be rotated. HELP!
Edited on: Tue, Nov 3, 2009 at 8:58:18 AM
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Don't do a mass. Do an in-place family using the roof category. If you're using 2010, click on the down arrow by component on the home panel. Choose the roof category. Choose solid, and blend. The blend works by creating a profile on one  far) end and another at the other end (close). You could also use extrusion and rotate it if this works. Create a void extrusion to cut it to sit on the roof.
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I created an in place roof component but could not rotate it from level. The profile is not a blend. It has a constant section that just diminishes as it penetrates into the main roof deck. Any other suggestions on how to create this roof?
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By the image you post you can create that roof with a "Solid Blend" then another "Void Blend" to remove the interior if you want that..... IF the roof is the second image you post (the PDF) then you just need to create a "Solid BLEND"... you don't need to rotate anything, use the BLEND....
Edited on: Wed, Nov 4, 2009 at 3:46:20 AM
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I guess I am getting hung up on the “blend” part. If I understand correctly, when you blend, you transition from one profile to another. That is not what is happening on an eyebrow dormer. The dormer profile only curves in one axis. The lines running back to the main roof are all straight. Otherwise you cannot get the plywood sheathing to lie onto the rafters. An eyebrow window is a semi-circular barrel vault that slopes upward toward the main roof. The profile at the main roof is the intersect point of the dormer and roof. There is no good way to create the intercept profile without projecting the dormer through the roof. The main roof has an 8:12 slope and the dormer has a 4:12. I guess that I could temporarily change the main roof to 4:12 project the dormer and trace the intercept with model lines and then rotate that back up to 8:12 and use the model lines for my intercept profile. There has got to be a better way!!
Edited on: Wed, Nov 4, 2009 at 10:21:28 AM
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If you want you could make a Roof By Face. See my blog for a video tutorial. revitguy.blogspot.com
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You can rotate the sweep if you unlock it, but looking at the illustration that you posted, the front bit is vertical. When you rotate the sweep it will rotate the front face also. A blend can have the same profile at each end, with the front one lower than the other
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Same one done with a rotated extrusion - the front is not plumb.
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This is the one you wish the "solid extrusion" has an option to follow along the path just like in AutoCAD. In this case using only ONE profile (the front end) and then extrude it along the path and maybe on roof plane face as well.
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68304_eyebrow_dormer.pdf
