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I have an arch-top window that I am about to trim out. I have already set the stool and will do the side and arched casings next. What is an easy and precise way to miter the casing of the top arch into the side casings? The arched casing is a urethane rubber flex mould already curved into the approximate arch. The moulding is a 3-1/2″ Howe casing.
Thanks.
Prescriptive codes don't address the connection at less common angles, so base the connection off more typical ones using bolts, structural screws, blocking, and steel tension ties.
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Joe,
I used Howe casing and the flexible moulding on mine and it sounds just like yours. My flex and Howe were not exactly alike however so I ended the Howe in a flat cut and then capped it with another moulding piece (a brick moulding actually) and the let the flex end in it.
So basically the Howe stops, a brick mould of about 3.5" (just wider than the Howe) runs perpendicular to the Howe and the the flex runs from the top of the brcik moulding and arches over the window to repeat on the other side.
The pic below is not very clear but maybe you can see it?
Mike
*Mike perches his arch on a capital which is a classical way of doing it. If you are certain you want a mitred joint, this is what I would do;tack the flex mold to the arch first in a temp manner to position it. Then stand a leg casing on the sill. With it held in place overlapping the flexmold, you can make marks at the inside and outside intersection of both pieces. Do this on each side. Now you can connect the marks across with a line and make the cuts and reinstall the pieces.