There are links to methods of developing the backing bevel using geometry and formulas in this recent Backing the Hip thread.
Roof Framing and Joinery Angle Calculator … digital cheat sheet.
Forgot to mention … the calculator input would be the 180° – 45° = 135°. So, two 8/12 slopes intersecting at a 135° corner angle produce a 12.25568° backing angle.
Edited 10/5/2007 5:39 pm ET by JoeBartok
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Thanks for the help. Not that I'm building a watch or anything, just like to use any opportunity as a learning opportunity.
Let's not confuse the issue with facts!