The Mitre Joint
This is the most simple of the angled joints and probably the most commonly found joint around your home. The main use of the Mitre joint (Fig. A) is for skirting boards, picture rails and dado rails (external corners), architraves, mouldings and picture framing. Usually, this joint is used to form a 90 degree corner, with the two pieces of timber to be jointed being cut at 45 degrees.