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Drywall Repair: Which Patch to Use for Which Size of Hole

The size of the hole decides the patch. Nail and anchor holes need only spackle. Small holes take a tape patch, medium holes a California patch, and anything bigger needs a new piece of drywall with something solid behind it.

Published 4 min read

Drywall patches fail for two reasons: the patch was wrong for the size of the hole, or there was too much mud on it. Pick the right patch below, keep every coat thin, and most repairs disappear under paint.

Quick chooser

DamagePatchCoats
Nail holes, screw and anchor holesLightweight spackle, pressed in and scraped flat1 to 2
Nail popsDrive a screw beside the nail into the stud, set the nail, then spackle2
Hairline cracksPaper tape bedded in compound2 to 3
Small hole, doorknob dentTape “sandwich” patch, or a self-adhesive mesh patch2 to 3
Medium hole, up to a hand’s widthCalifornia patch (a drywall piece with a paper flange)3
Large hole, wider than a handNew drywall on a backer: repair clips, wood strips or the studs3
Wet, soft or sagging drywallFix the leak first, then cut out and replace3

Before you start

  • Check what’s behind it. Before you cut, look or reach into the hole for wires and water pipes, and cut shallow if you can’t see. In the video we use for the methods below, Home RenoVision DIY cuts an inspection hole only about 3/4 in. deep.
  • Older homes. The EPA says homes built before 1978 are more likely to have lead-based paint. Health Canada says homes built before 1991 may have it. Health Canada also lists drywall, spackling, putty and paint among the surface materials in homes built before 1990 that may contain asbestos. Have suspect material tested before you sand or cut it.
  • Wear protection. Safety glasses and a dust mask for sanding, and ventilate the room.

Nail and anchor holes

Press lightweight spackle in with a putty knife, scrape it flush, let it dry, and sand lightly. For an anchor hole, pull or push the anchor in first so nothing sits proud of the wall.

Small holes: the tape sandwich

Home RenoVision DIY’s method for a doorknob-sized hole:

  1. Cut the ragged edge into a small square.
  2. Pack it with setting compound (“hot mud”) from all four sides until it pushes through behind.
  3. Push a piece of paper tape on edge into the hole, about 1/2 in. deep, the thickness of the drywall, and fill the gap it leaves.
  4. Tape over the top with a slight overlap and flatten.

Self-adhesive mesh patches are the store-bought shortcut for the same size of hole.

Medium holes: the California patch

  1. Cut back to solid drywall on all four sides. The damage is usually wider than what you can see.
  2. Cut a piece of drywall a little bigger than the hole, score the back, snap it, and peel the gypsum off the face paper around the edges, leaving a paper flange.
  3. Butter the hole’s edge and the wall around it with compound, set the patch in (don’t push), and smooth the flange with one thin pass.

It’s a repair for low-impact areas. Don’t overwork the thin paper, or it wrinkles.

Large holes: add a backer

Without something behind it, a big patch flexes and cracks. Options:

  • Drywall repair clips that clip onto the edge of the hole and take a screw.
  • Wood strips screwed behind the opening.
  • Cut back to the studs on both sides, and screw the patch to them.

Cut the patch first, trace it on the wall and cut the hole to fit. It’s easier than fitting a patch to a ragged hole. Tape the seams and plan on three coats, because the tape sits on top of the wall.

Finishing: where most patches fail

  • Hot mud for the first coat. Setting compound hardens by chemical reaction, shrinks less and lets you add a second coat the same day. Its working time is printed on the bag, for example 45 minutes.
  • All-purpose compound for the finish coat. It sands more easily. Put it on only when the patch is dry, not just hard, or it bubbles. In the video he waits overnight.
  • Feather wide. Each coat goes a little wider than the last, with more pressure on the outside edge.
  • Sand lightly and prime. Prime patches before painting so the sheen matches.

Mistakes to avoid

  • Thick coats. Less is more.
  • Fitting a patch to the hole instead of the hole to the patch.
  • Skipping the backer on a big hole.
  • Painting without priming the patch.

Watch it done

Sources

  1. Home RenoVision DIY on YouTube, shown on this site. 3 Ways to Fix Any Sized Drywall Hole (video, Home RenoVision DIY) Source
  2. US Environmental Protection Agency. Protect your family from sources of lead Source
  3. Health Canada. Asbestos and your health Source
  4. Health Canada. Chemical safety for do-it-yourself (DIY) projects and renovations Source

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