Old Work Boxes

[roger]

Here is the actual wording from the UL Fire Resistance Directory

WALL AND PARTITION ASSEMBLIES

Metallic Electrical Outlet Boxes

Listed single and double gang metallic outlet and switch boxes with metallic or nonmetallic cover plates may be used in bearing and nonbearing wood stud and steel stud walls with ratings not exceeding 2h. These walls shall have gypsum wallboard facings similar to those shown in Design Nos. U301,U411, and U425. The metallic outlet or switch boxes shall be securely fastened to the studs and the opening in the wallboard facing shall be cut so that the clearance between the box and the wallboard does not exceed 1/8 in. The surface area of individual metallic outlet or switch boxes shall not exceed 16 sq in. The aggregate surface area of the boxes shall not exceed 100 sq in per 100 sq ft of wall surface.

 

[augie47]

The few times I've used those without being fastened I also used these to provide added support. (Arlington SBS box supports)

 

[brantmacga]

I prefer the old work boxes with the “Tiger grips” built in versus F-clips.


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[mtnelect]

Take a hammer to the wall, and open it up and secure a metal 5S box with appropriate plaster ring. Let the plasters finish it up.