Inside Corner Bull nose ceiling crown molding

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  #1  
Old 12-21-20, 07:21 AM
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Inside Corner Bull nose ceiling crown molding

DIY home owner , first time attempting crown molding
I have a octagon Tray ceiling with inside corners greater than 90 degrees.

I measured the angle Starrett ProSite Miter Saw Protractor. It described a miter cut of 23 degress. ( verified 134 angle). Used "Bench dog" crown molding jig and a Hitachi miter saw.

I cut the molding, "upside down and backwards" according to instructions ( and utube).

When I placed them on the ceiling corner ( test molding), there is a gap. What am I doing wrong ? I am at a loss..
Is there step that I am missing. I dont think is my miter saw, seems to cut perfect 46, 90 deg angles).
Please direct me in the right direction. Thank you.


Ed Bonti


I measured to be miter cut of 23 deg (136 deg)

When I mitered ( upside down and backwards) to 23 deg, there is a gap as pictured.


 
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Old 12-21-20, 07:49 AM
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You probably are not holding it on the saw at the same spring angle as you are on the wall. From the looks of it, both pieces on the wall need to move up 3/16" or so. That will close the gap.

And generally you should be making test pieces for your corners.. 1x4s or similar to test your miters. Lay the short pieces of 1x4 flat, cut your 23s... put them together, hold them up, see how they look. If you need to adjust the angle, figure it out on the 1x4 first. Its cheaper than crown. So your angles could still be wrong if you haven't tested them that way.

And I will often make a 16" long block from 1x4 that is the exact height of the rise of the crown, and i use that as a fence behind every piece of crown i cut. Kind of like a crown stop on the base of the saw, but on the fence instead. That ensures I'm holding each piece at the right spring angle as I cut it, as long as the crown and my block are flush with one another when I cut.

You also need to remember that the corner tape on the drywall affects the measurement. So, if your crown has a 3" rise, you might need to mark the wall at 2 7/8" because the ceiling-wall corners aren't perfectly square.
 
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Old 12-21-20, 08:12 AM
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Ok, thanks for your quick reply. Just to make sure, my procedure is correct ? It should work the way i am measuring and cutting ?
Thank you.
 
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Old 12-21-20, 08:15 AM
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Not necessarily. Unless you have checked your angles with some 1x4, the angles on the crown could be wrong. Your little protractor is laying on the mud that is built up on that 135 degree corner. If your 1x4 test pieces are longer, say 2-4 ft long... it will give you a better idea of how the crown will fit. You make the cut on the 1x4 with it laying flat on the saw, then when you hold them on the wall, the 3/4" side of the 1x4 is against the wall. If the miter on the 1x4s doesn't look right, you need to dial in the angle a little better. It should be 22.5 if all things were framed perfectly.
 
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Old 12-21-20, 09:01 AM
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xsleeper. I went back and measured my riser more carefully. It read 3 7/8. ( I had 4 in. before). I adjusted, per your suggestion, 1/16 because of mud imperfections. I just moved projection line ( riser line) up about 1/4" and it shows almost perfect, but good enough for me. Thank you for your guidance.

PS. pictures are my sample test cut moldings.

 
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Old 12-21-20, 09:08 AM
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Sounds good. Keep up the good work!
 
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Old 12-21-20, 09:16 AM
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Looks good!
A little bit of caulk and your troubles with that joint will soon become a distant memory.
 
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Old 12-21-20, 09:39 AM
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This is unrelated to your project. That sure is a pretty ceiling.
 
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Old 12-21-20, 09:49 AM
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Haha, the finisher notices the knockdown texture.

With wide crown its sometimes best to glue those miters with PL Premium rather than wood glue.
 
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Old 01-04-21, 11:49 AM
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Thank you all for your help. Here is the final project.


 
2john02458 voted this post useful.
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Old 01-04-21, 12:33 PM
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Looks good!
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