Patching Large Holes in Drywall
By Lemoon's Painting
A drywall hole larger than a fist is not filled, it is rebuilt. The damaged area is cut back to a clean rectangle, backed with wood or opened to the studs, fitted with a new piece of drywall of the same thickness, taped, covered in several thin coats of compound, textured to match and primed. Done in that order, the patch disappears once the wall is painted.
A doorknob that went through the wall when a door was flung open. The space left by an old medicine cabinet or a removed intercom. The opening a plumber cut to reach a valve, or the ragged hole left behind when a television bracket was pulled off. Large holes in drywall happen in every house. What matters is how they are repaired, because a large patch done badly is visible from across the room for as long as you own the house.
How big is a “large” hole?
The method depends on size. As a working guide:
| Size of the damage | Usual repair |
|---|---|
| Nail and anchor holes, small dents | Filler or compound, sanded and primed |
| Up to a few inches across | Self-adhesive mesh patch, or a California patch |
| Larger than a fist, up to a stud bay | New drywall piece fixed to wood backing |
| Wider than a stud bay, or damaged framing | Cut back to the studs, new section, joints taped |
Above the first row, filling is not a repair. Compound has to be supported by something, and in a hole it is supported by air.
What is the right way to patch a large hole?
The damaged drywall is cut back to a clean rectangle, the cavity is checked, wood backing is fixed inside or the opening is taken to the studs, and a new piece of drywall of the same thickness is screwed in. The seams are taped and covered in thin coats of compound, then textured, primed and painted with the wall.
The repair, step by step
- Look inside first. Before any cutting, the cavity is checked through the existing hole for wiring, pipes and ducts. Stud bays carry all three, and a saw does not know the difference.
- Cut a clean rectangle. The ragged edges and any crushed gypsum around the hole are cut away, out to sound board. A square opening can be filled far more accurately than a round one, and it gives straight edges to tape.
- Add backing. For holes within a stud bay, strips of wood are screwed inside the opening at its edges, so the new piece has something to fasten to. For larger openings, the cut is taken to the center of the nearest studs on each side.
- Fit a new piece of the same thickness. Interior walls are commonly half-inch board, but some ceilings and the fire-rated walls and ceilings next to a garage use thicker board. A patch that is thinner than the wall sits recessed and needs heavy filling; a thicker one sits proud and shows.
- Screw it in with the heads just below the surface and the paper intact.
- Tape the seams. Paper or mesh tape goes over every joint between the patch and the wall, bedded in compound. Without tape, the seams crack along their length sooner or later.
- Build up thin coats. A first coat of setting-type compound is common because it shrinks less, followed by lighter topping coats. Each is allowed to dry or set as its label states, and each is feathered wider than the one before, so the patch blends into the wall across a broad area rather than ending at a hard edge.
- Sand and check in raking light. A light held flat against the wall shows any ridge, hollow or edge that the eye misses face-on.
- Match the texture, if the wall has one.
- Prime the patch, then paint the wall.
The wide feathering in step seven is the part people underestimate. A patch that is truly flat over a foot or more blends; a patch that is flat only over its own footprint leaves a gentle bump you can see in the afternoon light.
Medium holes and the California patch
For holes from about the size of a coin to a little larger than a hand, there are two good options. A self-adhesive mesh patch is stuck over the hole and covered in compound. A California patch, sometimes called a butterfly patch, is a square of drywall cut so that its paper face extends past the gypsum on all four sides. The gypsum fills the hole and the paper flange is bedded into compound over the surrounding wall, so it needs no backing and no separate tape. Both still need thin, wide coats and primer.
Older homes with plaster walls
Not every wall is drywall. Many pre-war homes in La Mesa and in the older neighborhoods of San Diego, such as North Park, have plaster over wood lath. Plaster is thicker and harder than drywall, and a hole in it often has loose plaster around the edges that has broken away from the lath. The repair secures or removes the loose material, brings the patch up to the full depth of the original wall, and finishes it so the edge between old and new does not crack.
Homes built before 1978 may also have lead in older paint layers, and cutting into those walls disturbs that paint. Ebenezer is EPA lead-safe (RRP) certified, so that cutting is contained and cleaned up the way those rules require.
Why the patch and the paint go together
Even a perfect patch has to be painted, and paint is where many patches give themselves away. New compound is far more porous than painted drywall, so without primer it drinks the paint and dries to a different sheen. Touch-up paint over a primed patch on an eggshell or satin wall can still show. The reliable result is to prime the repair and paint the wall from corner to corner, which is why large holes are best repaired as part of an interior repaint. Ebenezer uses Dunn-Edwards and Sherwin-Williams on interiors, and he will tell you which sheen will hide the repair best.
Where this sits in the work
Ebenezer repairs the drywall and then paints it: holes, removed fixtures, access openings and damaged corners rebuilt and prepared so the paint on top looks like one continuous wall. Framing repair is not one of his services, so if the damage reaches the studs themselves, he will tell you so plainly and point you to the right trade. In the older stucco tracts of Chula Vista, for example, it is common to find a decades-old patch that has cracked at its seams and needs redoing before a repaint.
If there is a hole in your wall that you have been hiding behind a picture frame, it does not need to stay there. Ask for a free estimate and Ebenezer will look at it, tell you how it would be rebuilt, and fold it into the painting so the wall comes out as one surface. More on stucco, drywall and wood repair.
Common questions
Can a large hole in drywall be filled with spackle?
No. Spackle is for nail holes and small dents. In a hole larger than a few inches it has nothing to hold onto, it shrinks and cracks as it dries, and it can fall back into the wall. A large hole needs a new piece of drywall fixed to backing or framing.
What is a California patch?
It is a drywall patch for medium holes. A square of drywall is cut with its paper face left wider than the gypsum on all sides. The gypsum fits the hole and the paper flange is bedded into compound over the wall around it, so no tape or backing is needed.
Why does a drywall patch show through the paint?
Usually for one of three reasons: the patch was left slightly proud and casts a shadow in side light, the texture around it was not matched, or the new compound was painted without primer and soaks up the paint differently. Each of those is prevented during the repair, not after.
My house has plaster walls, not drywall. Is the repair the same?
Not quite. Older plaster is thicker and harder than drywall, often over wood lath, and a patch has to be built up to its depth and kept from cracking at the edges. Ebenezer will tell you at the estimate whether your walls are plaster and what that changes.
Is there anything behind the wall I should worry about before a hole is cut bigger?
Yes: wiring, plumbing and ductwork run through stud bays. Before the hole is squared up, the cavity is checked through the opening so the cut does not hit anything. On a wall shared with the garage, the patch also has to keep the wall solid.