Use a set square? (Or 2) https://www.screwfix.com/p/dewalt-rafter-square-7-177mm-/780ky
Wouldn't that require the wall I am fixing to to be plumb?
I am probably over thinking this
Theoretically yes. How out of true are your walls? Using a larger square will make any wonk in the wall have less of an effect
@user16171 started
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Use a set square? (Or 2)
https://www.screwfix.com/p/dewalt-rafter-square-7-177mm-/780ky