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We have rounded outside corners throughout our house what is the best approach to installing crown cornice molding?

The baseboards that are currently installed just come to a 90˚ point and the gap is filled in with putty, trim paint, mud, or combination thereof.

Any suggestions for a finely finished look to go with the rounded corners?

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I've never used it -- I prefer the angled look like in Doresoom's answer below -- but have you looked into flexible crown molding. – Niall C. Jan 31 '11 at 14:08
didnt undestand , what degrees you used for this corner? bevel and miter – user11501 Feb 8 '13 at 15:41
what is the approximate diameter of the curve? – bib Feb 8 '13 at 15:48
up vote 16 down vote accepted

You can add a center section at the corner that runs at a 45° angle to either wall. That cuts down on any gap you might have, but makes the installation and cutting a bit more difficult. My house has a few faux pillars that use this technique:

enter image description here

(I know, I know, I haven't gotten around to touch ups after we painted the walls...)

And here's a lookup table for cutting crown molding (source):

enter image description here

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Nice answer and great chart. Thanks for the info. – shirlock homes Jan 31 '11 at 9:44
Keep in mind that the chart is useless if you assume that corners are 90 degrees. You've got to accurately measure. – Chris Cudmore Oct 1 '13 at 13:41

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