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I am replacing an existing bathroom vanity fixture. After taking the old one down I discovered the builder did not have a junction box behind the fixture. No surprise there. So how do I put a new box in with a minimum of problems. Already dealing with the wall after removing mirror. Will an old work blue box handle the weight if I don't have anything to attach it to?
 

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Naildriver
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An old work box should suffice, OR you can cut a 2x4 about 8" long, run it in the hole vertically and screw through the sheetrock to hold it in place. Then you can install a metal pancake box, which will definitely hold the weight. Patching over the screw holes is all you will have to do.
 

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Big Dog
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I have used these with great success.
You cut out a 4.25 inch hole
Knock out a tab
Pass the wire through the tab hole
Insert the box into the 4.25 inch hole
Turn the three screws which in turn opens the wings until they are snug. The wings secures the box to the drywall from behind and should be more that strong enough to hold a bathroom vanity fixture.

 
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Super Moderator
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Some fixtures are the junction box. Can you post a picture?
 
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