On Wed, 26 Sep 2012 10:50:52 -0600, Dave Balderstone
wrote:


Has anyone successfully joined two lengths of the stuff? Scarf joint?
Lapped splice? All suggestions welcome.

A lot of cabinet manufactures provide pre-finished crown to match the
cabinets. For some reason (probably shipping) most come in only 8'
lengths so joining them is often required.
Here's what we do. Stand the first piece on edge on your miter saw
(with the back flat against the fence) and cut the inside 45. Install
that piece being sure to position it to maintain the straight line
needed for the ending piece. Cut the overlapping 45 on the ending
piece. You can often cheat here a little and cut the overlapping
joint at 45 and just a hair more. This will help the joint stay
closed at the front. You can always cut it back to a true 45 if you
don't like the fit. Testing the joint and angle with a small scrap is
helpful but not required.
If the ending piece runs in to a wall (square or inside corner) I'll
fit that end first and measure back to one point on the first piece.
If the ending piece continues around an outside corner, I'll fit the
joint first and then mark the corner for the turn.

Good luck,

Mike