When installing boxes, the gap around the box cannot be greater than what inch?

When installing boxes, the gap around the box cannot be greater than what inch?

• A. 1/4"
• B. 1/8"
• C. 3/16"
• D. 1/2"

Answer: (B)

When a box is installed in a wall, it must sit so the wall finish can form a clean, flush surface around the box and the device sits securely against the box. The gap between the box edge and the finished wall should be very small to keep the faceplate and device mounting solid and to avoid cracks or misalignment in the wall finish. The maximum allowed gap is 1/8 inch. If the gap were larger, the cover plate wouldn’t sit evenly, the device screws could pull the device out of alignment, and the wall finish wouldn’t be able to finish neatly around the box. In practice, if you see a gap bigger than 1/8 inch, you’d use a mud ring or adjust the box depth so the front edge ends up flush with the finished wall. The other options—1/4 inch, 3/16 inch, or 1/2 inch—are too large and would prevent a proper, flush installation.

When a box is installed in a wall, it must sit so the wall finish can form a clean, flush surface around the box and the device sits securely against the box. The gap between the box edge and the finished wall should be very small to keep the faceplate and device mounting solid and to avoid cracks or misalignment in the wall finish. The maximum allowed gap is 1/8 inch. If the gap were larger, the cover plate wouldn’t sit evenly, the device screws could pull the device out of alignment, and the wall finish wouldn’t be able to finish neatly around the box. In practice, if you see a gap bigger than 1/8 inch, you’d use a mud ring or adjust the box depth so the front edge ends up flush with the finished wall. The other options—1/4 inch, 3/16 inch, or 1/2 inch—are too large and would prevent a proper, flush installation.