An oversize drywall cutout around an electrical box can ruin the appearance of an otherwise perfect taping job. The best way to fix it is with drywall compound and joint tape.
By the DIY experts of The Family Handyman Magazine:July/August 2011
Bevel the edge of the drywall with a utility knife. Then fill in the
gap with fast-setting joint compound.
Spread the fast-setting compound into the gap and surrounding
area and embed the tape right up to the edge of the electrical box.
Let it set up and apply the final two coats of lightweight compound.
Sand with a medium-grit sanding sponge.
We've all done it—cut the electrical box opening too large.
Sure, you can cover it with a “jumbo” electrical plate, but
that can look pretty stupid, especially if there are other
boxes nearby. Instead of squishing joint compound into the
gap (it'll always crack), try this fix.
First prepare the gap and fill it with compound (Photo 1). Then apply joint tape and additional mud coats (Photo 2).
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.
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