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Have a 4' section on a "bump-out" that has 18" return walls back to the rest of the room. Am installing crown around room using 3 & 5/8" crown. About halfway around room, not much trouble till this windowed bump out! Left return outside corner is 92°, left inside is 88°, right inside is 90° and right outside corner is 94°. The 4' section above the window is not level, has 2 big dips in ceiling making a straight edge wobble when placed on the ceiling, one at 6.5" in the other at 14"...I think from water damage to ceiling at one time. This causes the crown to be 1/4-3/8" below ceiling at either end. Have tried for 3 days putting up crown, trying to cope the left inside corner..no magic so far. Help! I am at the point of using corner blocks but I hate to give up now! How do you work these kind of wonky areas?..
Cheers,TC
 

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Got a picture?
 

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AHH, SPANS!!!
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the best trick to work crown to a wonky ceiling is to shave some out of the back top side of the crown where it hits the ceiling. this alters the profile some but sometimes not to noticeably. also, when cutting crown I always lay it on the flat, you can make minor adjustments to the angles on the saw and lock them in on the saw which helps a whole lot. some crown is cut thirty times install one time :)
 

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Haverhill Trade 1965
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532 Posts
Without pictures, the simple math would suggest 46 degrees each for left outside miters and 47 for right. The left inside corner would suggest 44 degrees for the cut to give you the cope line, but it may still work with 45 with more back cut. The front piece you may have to set with top space at corners equal and scribe the sag with dividers or compass. A block the same width as with a snug fitting sanding belt might form any irregularities if cuts are close.
 

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AHH, SPANS!!!
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that should not be to bad to work out, fine tune the angles such that they fit in the corners. plan on running up and down the ladder with little test pieces, they are the simplest way to get a tight fit sometimes. if you have a compound miter saw lay the crown flat on the backside and use the pre designated crown slots on the saw( 31.6 Miter and 33.9 Bevel) to make the cuts and adjust at tiny amounts to fit the odd angles...
 

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Haverhill Trade 1965
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532 Posts
Once you get the cuts figured out I would install the right and left pieces first, make the center piece a sixteenth long, put one end in, bow the middle outward until the second corner slides in and release the bow. The pressure will make a tight fit and sometimes compress the joint and close any tiny gaps. Be sure to keep plenty of pressure on the first end so it doesn't pop out as you bow the piece.
 
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