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I am detailing a roof edge where we want a "flip," and by that I mean a curved flare. A real common detail in bungalows, arts and crafts designs, etc. I've not done a flared roof before.
The main pitch is 8:12, overhangs are a big 42" from framing to outside face of subfascia, and the rise we want is about 2-1/4". Just a little flip, with point of tangency about halfway up the overhang.
We could bandsaw the curve into some scabbed on tails, but I thought something else might work OK.
See the sketch here to tell us if this seems reasonable. A 2x subfascia is ripped so its top is pitched at 25 degrees, then nailed onto the rafters so the peak is up 2-1/4" over the rafter ends. A 5/8" furring strip goes upslope a little as a shim. The sheathing is in two thicknesses of CDX ply, and I am not sure what we will use, because everything above will be 5/8 OSB. The two lines you see in the translucent ply sheet represent about 24" width of a 48-wide sheet.