How to miter a cove molding in a sloped ceiling?

[Mraff]

Hello!

I've found a lot about coping with crown molding, but most seem to have trouble with 90-degree corners. I have a different problem. I'm planning to install crown molding on a sloped ceiling where the angle between the slope and the ceiling is 144 degrees. How do you actually cut the molding then? You can't just divide the angle by two. I think I've tried almost everything now without success. Does anyone have the solution?

 

[sventorparn]

Hello.
One might have to resort to the old method by using a knife.
One piece is straight and all the way into the corners.
The other piece should be carved in at a 90-degree angle.
It's a bit of a hassle, but it works after a few attempts... and there will be some putty.
The coving trim is built with a 90-degree angle after installation, so some modernizing on the backside may be needed to get a smooth edge against the wall.
I have also seen somewhere that there are coving trims that are not 90 degrees.
Good luck.

 

[Farzan]

There might be some confusion about what Mraff is after?

Mraff - if you look at the clumsy sketch here - I understand it as you're wondering how to miter at angles a and b when installing moldings along 1, 2, and 3 at the short ends of the room - is that correct?

 

[Mraff]

Yep, that's exactly how Farzan describes it.

 

[Tiger79]

When I built a deck with angled corners, I bought a miter angle. Just hold it at the angle and fold it correctly, move it down to the miter saw and adjust it to the metal piece on the tool. Cut and then it's done.

 

[Mraff]

The problem is solved. You do exactly as it says in all the other threads. You divide the angle by two and place the list in the miter box just as it sits on the wall. The main problem was that I measured an incorrect angle, how embarrassing.

Thanks anyway for the responses!