Moulding in ceiling with different angles

[Bobbilon]

I have tried to find a solution in the forum but haven't found anything.

I don't want corner blocks.

One side of the wall is about 45° and the other is 90°.

I would like to have the same trim all the way around the ceiling.

See image.

 

[Nissegandhi]

Carpenters of the old school would install such ceilings with a cove molding and whittle it together at the corners, and plane the molding on the knee wall for the right angle. The simplest method is to use a regular flat half 15x44 as a ceiling mold. The miter on the long wall in the flat part becomes 45 degrees. The miter between the flat ceiling and the sloped ceiling is bisected so both moldings are equally wide. On the knee wall, first attach the longitudinal molding cut at 90 degrees. The molding on the sloped ceiling is cut vertically and trimmed on the underside to be as wide as the one on the knee wall. You can also do the same with a shadow molding 21x44, but it's easiest if you place a 21x21 corner block between the knee wall and the sloped ceiling. However you do it, it will look good and only you will notice it. Take some small pieces and try it out to avoid mistakes.

 

[pjkw]

You don't specify what kind of molding you want; if you install crown molding with the flat side against the ceiling, it's quite simple.

 

[Fällebyggarn]

I have thought about that too. Of course, it was Allmogelist ordered but no corner blocks were allowed.

And no matter how I tried to fit it with 90 and 135 degree angles, it just turned out to be crap.

I have moldings but they are nicely stored in the attic.

 

[Kurtivan]

Read a bit here and see if you get wiser:

https://hvilaro.blogspot.com/2008/07/gering-taklist.html

 

[Karl-Ove Qvarfordt]

Here's how I did it
This image shows where the slanted roof meets the low long wall

 

[Karl-Ove Qvarfordt]

If the angle above the left side of the window is 45’, cut both at 22.5. Try with pieces.