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COPE: To cut or shape the end of a base or crown molding so it will cover and fit the contour of an adjoining piece of base or crown molding. In this article I explain how to install crown molding by coping the joint with a drawing and a picture.
Here are the first 2 of the 5 paragraphs of this article:
COPE: To cut or shape the end of a base or crown molding so it will cover and fit the contour of an adjoining piece of molding.
We generally cope the inside corners of baseboards and crown moldings. This started in "the old days" when air nailers were not invented yet. A carpenter would nail everything by hand. He noticed that in an inside corner, if the base was mitered, the opposing corner would have a tendency to open up with the hammering process, making it tough to get a nice tight joint. Mr. Cope came along and thought that if he could easily cut the profile square on the opposing molding, as he nailed it in place, it would remain a tight joint because it would slide along the molding instead of opening up. This was explained to me, at a very young age, by my father and I never forgot it. The part about "Mr. Cope" is writer’s privilege, sorry about that.
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Now, to actually cut the cope joint. On one side of the inside corner measure the length of the required base or crown molding, cut both ends square and fasten it in place. On the opposite inside corner cut the molding at a 45° as if you were going to miter the joint. The cut edge will show the profile of the molding to follow. Use a coping saw, hence the name. Instead of cutting the profile square on the end, bevel it back just slightly, so in case of adjustment there is less material to remove this way. See the picture, below.
When installing crown molding, I prefer not to cope the inside corner. For one thing, I always use a nail gun and the second thing is the crown molding is viewed from below, not giving as nice a cut as a miter. If tying in a crown with one that is already in place, then a cope joint is necessary. Follow the same procedure as coping a baseboard.
Coping a baseboard—try it, you’ll like it.
Dave
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