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I have used backers in the past. It really helps on the walls that run parallel to the ceiling joists where you don't normally have a nailer other than the plate on top. The important thing is to take a piece of your crown and fit it to the inside corner of a framing square. Make sure both flats of the crown are hitting the framing square and see how much space you have behind the crown. Make your backer a little smaller to allow room for adjustment when installing the crown. You also have to stop the backer short of the corner like it shows in one of the pics in the PM article. If you don't if will interfere with your crown end that butts into the wall.
Mike Hawkins:)
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