ceiling fan box extension?
Here's my dilemma- I've got a plastic ceiling fan box screwed directly into a joist in my living room. I'm in the process of adding a tongue and goove ceiling and am curious if I can attach some kind of extension to the box or if that's against code or would present some other problems that I can't imagine. Another option would be to unscrew the box and put a block behind it to make up the spacing difference.
Any responses would be greatly appreciated!