GeneDavis Posted September 13, 2020 Share Posted September 13, 2020 I'd like to help a client built some difficult roof returns, by building full sized models that can be used at job time to cut and install framing parts. It is a real 3D challenge. A center gable is pitched at 11.25 and hipped wings at L and R are recessed back a foot or so. Specified on the drawings is the radius roof overhang at the hipped roof edges, but nothing is called out for the returns that are shown in elevation. I suspect the plans were done in Revit. The section on the architect's section detail call out the curve for the flare as 108" radius with point of tangency where the 4.5 pitch roof meets the building line. Nothing further is said about what to do for the gable returns, which in my opinion are the key signature architectural feature of the building. Pics attached here show the Revit-drawn elevation of the return, where I am in Chief with it, and a micro-plan to focus just on the geometry. The software goes nuts when I try to join these at hips and valleys. Equal-equal is OK, but the program produces weird results for the irregulars. As with returns of this type, fascia height is a constant. I know that if the "hip" could be generated, it would not be linear in plan view. It is a curve, and not a circular segment. How these things get built is a mystery to me. Maybe shipbuilders are better equipped mentally to handle it, because curve fairing is necessary, I think. I know nothing about Chief solids, and all the boolean stuff that goes with it. Maybe Chief solids can generate the curve and I can plot it, then get busy with the band saw. Curved roof edge study.plan Link to comment Share on other sites More sharing options...
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