I'm fixing skirting boards - making the standard corner joints where the corners are (approx.!) 90 degrees: i.e. 45 degree mitres on externals and scibed & butted joints on the internals. My question is: what kind of joint should I make on an internal corner of around 135 degrees? Since it's internal, you might expect to do it by scribing & butting; however it would be very hard to cut the scribed board with a coping saw, given that so much of it would be in contact with he other one, so I'd be making a much thicker cut than usual. (That's not very clear I know, but if you draw a 135 degree angle I think you'll see what I mean.) So I'm tempted to just cut two 67.5 degree mitres; but that's probably as likley eventually to open up as a mitred internal 90 degree corner would be - not as far, or course, but even so - and the corner is a very visible one. Any ideas? Maybe there's a special technique I don't know for making a scribed cut at that angle?