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Forums >> Revit Building >> Technical Support >> Serious problems with roof
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Hello, I can't seem to find the right method to draw our roofs. We use prefab roofs, which come from a supplier that has its own demands for placing the roofparts. In the attached image you can see our way of detailing this roof. (pre-Revit). Now the main problem is that the rotation point of the roof is 35mm outside the roof. There's no way I think Revit is prepared for this? If we have a roof with all the same angles, the roof by footprint works OK, and i have created an excel sheet to calculate value "X" (in the attachement), so I can fill in the plate-offset. This is good. But when I have a shielded roof, with different roof angles, I need different plate offsets, since value "X" is different for both angles. As you can see and imagine from the attachement. Right now I'm creating a mass for this type of roof, but rather I'd use the roof-by-footprint function. Could someone help me out (again)? Thanks in advance!
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I don't see any problems doing what you need in Revit. It may help if you read this portion of your HELP Roof Boundary Line Properties. Pay attention to Plate Offset From Base and Offset From Roof Base.
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Well, I really tried all versions of this option. If you like and have the time, please give it a try. An L-shaped Shielded Roof, and give the roofs different angles, with according different roof-plate-offsets. Revit won't be able to create the roof.
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Is it that you'r angles are slightly out? I had an odd sided, L-shaped roof that I couldn't get to work with differing overhangs & a continuous ridge, i ended up doing it as 2 L roofs (internal & External roofs, if you see what I mean), fiddling on till it worked & the ridges met, then I created a single roof from the information. You need all the ridges to line up I assume? You might want to try & create it as above & look at a few sections No idea what a 'shielded' roof is, can you enlighten me?
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Hello Matthew, right now we're making just 2 roofs, wich overlap each other, and then use vertical opening, to cut the triangular piece of each roof, where it overlaps the other roof.... Shielded roof, I already thougt that was not the proper translation, but I mean: http://www.livingstone.org/woningdetails.html?id=1 In Holland we call this a "schildkap" -> free translated: shield roof. Because you could see the shape of a shield in it I guess.... Thanks for thinking with me!
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matthew, please post an image of your roof sktch that shows what sides have slope.
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WWHub Plan showing differing widths Sections through each with differing angles 3d Soffit is at the same level throughout but due to different angles the offsets from roof base are different, but I had to do two differing roof's to get the final single roof to work JeroenjeM - you might want to look at changing your Excel sheet to calculate the offset values required from a more suitable point, rather than offset 35mm? This might make it easier?
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Hey, well, the Excel sheet is just to calculate that value. It's because of the roof's rotation point is 35mm outside the element. I also tried to add an invisible layer to the roof, with a thickness of 35mm, so that the rotation point would be on the roof. This works, except I can't hide this help-layer. So I thougt to create a material with 100% transparancy, and that seemed to work, but this made the complete roof transparant, till the last layer. So still no real good way to create these kind of roofs. How do you call them in English by the way? Jeroen
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Probably called a 'hipped' roof What about creating the batten (the wooden (?) rail 140mm high with the curved top) as a separate wall & using that as a springing point, or doing as you have been using the 'Edit Cut Profile' tool to cut back the invisible layer? Maybe you could post an image of how you're getting on or what the problem looks like?
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Believe it or not matthew, this roof can be done from one roof sketch. I would have one question. Do you expect the edge of the sloping roof to be at the same elevation throughout? I understand that the roof slope pivot is fixed at the wall edge so that the roof is always at the same elevation along the wall plane. Given that and if you want the roof edge at the same elevation, then the soffit width has to vary. You can not have both conditions.
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what do you mean by hipped roof ?
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Astroafield, if you read the topic, this would explain itself. In the meanwhile I still don''t have a solution to my problem. Tried a lot with masses, but it's all just not the perfect answer.  A short summary of the problem: you apparently can't create an L-shaped roof (hipped roof) with different plate offsets and different slopes. Is there a workaround for this?
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I think I may have a solution, if I understand the issue correctly. Try playing around with using standard roof boundary lines and slope arrows to define where the ridge would be. Set the slope to what each part should be. Then set the 'Height Offset at Tail' (instance props of the slope arrow) to your 'X' value you calculated according to your first picture. Do this for each slope arrow and you should have something you can play around with to work for your situation.
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Hello Swiftimage, indeed, today I've been tweaking with these settings/options also. It seems to work! Thanks for your efforts, and your time. Kind regards, Jeroen
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Thanks SwiftImage, I have also learnt something today. And it's not even 9am yet!
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