You may want one of these to find the correct angles:
(18" size minimum for crown molding)
Now here's some sites to help:
http://www.altereagle.com/Crown_molding.html <<<<< Has tables for angles up to 179 deg
I would approach it by using two 1'-2' scraps of the molding, cut at 90
degrees at the each end. I would then take one scrap, select a corner and
lightly scribe the left and right sides of the corner to locate the
ceiling's intersecting line. I would then line up my left side and make my
inside corner marks at the intersections and then my right. Cut it and see
if I need to make any adjustments to the either the saw or table angle.
I usually approach all instals of crown in this manner, whether 90 degree or
not. Saves time and takes the guess work out of it.
If you need further clarification I can email pics demonstrating how this is
I've been installing crown molding in my house. After installing
molding in an eating area that had walls at 135 degree angles between
them, I longed for those 90 degree walls. Coping at these angles is
very tricky business. I had an easy time coping at 90. Pat myself on
the back. When I got to this problem space I eventually gave up
coping. The last of the joints here were simply mitered. My cieling
in this area was also completely out of wack complicating the problem.
Of course you may enjoy the challenge.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.