Flush mounting a nail-on 4" square box with ring


Old 03-06-16, 09:27 PM
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Flush mounting a nail-on 4" square box with ring

4" box, with stud mounting ears. If I mount the box to where the ear is flush with the stud (pulled forward) the front of the box is flush but then a mud plate adds its thickness, then the height of the two screw heads.

The question is what should be flush with the back side of the dry wall ?

Is it the empty box and the drywall somehow becomes thinner or does it not show ?

Or does one put the box back the depth of the thickness of the mud rings sheet metal (same thickness as a blank cover plate) and then what about the screws heads ? do they just 'dig' into the sheet rock ?

The particular box I have is

Name:  1900 nail on.jpg
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Last edited by PJmax; 03-06-16 at 11:41 PM. Reason: added pic from link
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Old 03-06-16, 11:44 PM
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Welcome to the forums.

The box gets mounted flush/even to the face of the stud. The ring is sized based on the thickness of the sheetrock. The screws from the box will get pressed into the back of the rock.

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