Return to the Electrical Wiring Forum | Post a Follow-Up

Old work boxes - hole too big

Posted by perel (My Page) on
Mon, Jul 7, 08 at 0:48

I'm putting a bunch of old work boxes into plaster. Being plaster, the holes sometimes end up a bit larger than intended. How should I patch these holes so the 'ears' on the old work boxes can grab on correctly? Generally this isn't very much, just 1/4 to 2 inches too big. If it was a bigger patch, I'd know what to do, but usually for a patch that small I'd just put a blowout patch in and that doesn't seem like it would provide enough strength for holding a box up.

Follow-Up Postings:

RE: Old work boxes - hole too big

For the first hole, make one smaller than needed. Enlarging it a bit is easy. But for your problem, depending on how the box is mounted, use pieces of 1/4" plywood about 1 1/2" wide and 4" to 5" long. Coat with glue one side. For walls with smooth backside, white glue is OK, for walls with rough backside, use construction adhesive. Insert the plywood through the hole with the adhesive against the wall surface and clamp in place at the exact desired location. I use small C-clamps. The whole thing requires some dexterity. Unclamp next day. Patch exposed wall surface as necessary. Then install electrical box.

RE: Old work boxes - hole too big

If you are dropping in a single-gang box, could you enlarge the hole to fit a double-gang box and put a single gang mud-ring on it?

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here