It s best to cut a standard inside corner template as you see in the video above.
Crown molding angles for vaulted ceiling.
Find a consistent height in your room with the vaulted ceiling say 8 to 9 high or follow the lowest point in the ceiling and simply run your crown molding horizontally around the room.
Divide 30 by 2 15 degrees.
Solution to crown molding in a room mixed with 90 degree and 45 degree walls.
Use that to determine the exact low point of where the two pieces of crown will touch in the corner on the wall.
Tighten the angle finder to the desired angle.
Make both cuts at 15 degrees each.
Make sure your scrap piece fits squarely into the miter saw before cutting.
Standard 45 degree cuts can be used on a sloped ceiling.
This usually requires an angle setting of either 32 or 45 degrees.
Example 120 degrees a regular flat ceiling is 90 degrees.
Take an angle finder and measure the degree from the wall to the ceiling.
You need three pieces of molding to get started.
This is what you set your miter saw angle to.
A quick and dirty crown molding tip slide angle finder into the angle between ceiling planes.
Presented by frank fredericks custom homes this video explains how to install crown moulding on a vaulted or cathedral ceiling without using a 3rd piece tr.
Place the hinge into the corner and then slide the legs out to.
We set the miter angle to the left side 17 5 degree mark and then held the crown molding such that the lip that would touch the wall was sitting flat on the compound miter saw and the lip that touches the ceiling was pointed away from the fence towards the person making the cut.
Take 120 90 30 degrees difference.
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This will give you a 120 degree vaulted corner.