Usually metal boxes are attached to vertical beams ("studs") in the wall. I have an opening in a lath & plaster wall with a horizontal beam just about 1/2"-1" underneath the opening. I cannot attach it directly to this beam. There is no stud closeby. I was thinking of drilling two holes through the metal box, then adding a custom piece of wood as a spacer between box and beam and screwing the two screws with an angled screw driver through the spacer into the beam from the inside of the box:
Is this acceptable?
A couple of notes:
- It is often proposed to increase the size of the hole. Since this is lath & plaster I really want to avoid this and stick with the current opening.
- Once fixed and screwed in place, I plan to fill the gaps with plaster of Paris
- I cannot use the this old work box because the hole is already too wide
For reference, this is how it currently looks like with a plastic old work box. You can see how bent the box is already because some plaster broke off during the stiff wire pulls, so the flanges are not flush on wood/plaster between top/bottom. There is so much tension currently (and the #12 wires don't help here) that I am worried this is not a future proof install (not even to mention, it's not a neat one).