Mitering trim joints works, but its not the method most pros prefer. Making an airtight coped joint is easier than you might think — and more durable too. Coped joints do not require perfectly square corners as miter joints do, and coped joints are also less likely to open up after a few seasons of expansion and contraction. As the author explains, all you’ll need to start coping is a $10 coping saw with a few blades to go along with your miter saw, or, if you plan on doing a great deal of coping, follow the authors instructions to turn your jigsaw into a supercharged coping saw. The article includes step-by-step instructions for producing perfect coped joints in both flat molding and crown molding, complete with detailed pictures to guide you through each step.