I'm trying to put up some crown molding for the first time. I'm working on my first inside corner and I can't get the coped joint to line up nicely. I thought one of the reasons for using coped joints is that they fit together easily?
Anyways, I mitered the crown at 45 degrees using the "in place" method. I cut what appeared to be a perfect cope joint at the end of the crown. I went to assemble the joint and there is about a 1/8 inch gap at the very top of the joint where the top flats of the moldings come together. The rest of the joint fits nicely, but I can't figure out how to close this gap at the top. I tried tapping upwards on the first piece of crown to close the gap, but that didn't work. My first thought was that I wasn't getting an accurate cut with the "in place" method, so I went through this whole process again using the "flat" method with my compound miter saw, but I ended up with the same gap at the top of the cope joint.
I went back to the "in place" method and tried adjusting the miter angle to see if that would help. I found that the gap would close if I mitered at 41 degrees instead of 45 degrees before cutting the cope joint.
I have read a lot about how to cut cope joints, but there doesn't seem to be much written about how to adjust them to close gaps for a good fit.
I'm looking for advice on the best way to miter, cut and adjust cope joints in order to eliminate gaps at the top of the joint.
Also, are coped joints supposed to be caulked prior to painting?
I'm really trying hard to install this crown the right way by using coped joints for inside corners, but it's just not working. I thought coped joints are supposed to be forgiving for corners that aren't a true 90 degrees? I'm sure I'm doing something wrong and making this a lot harder than it needs to be.
Thanks for your help.
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