Four kinds of damage, four kinds of fix
Most wall damage falls into four types, and each has a standard repair. Telling them apart saves money, because a nail pop does not need the same visit as a stair-step crack.
Nail pops and screw pops
A small round bump with a crack across it is a fastener that has backed out. It happens as lumber dries and moves. The repair is to drive a screw an inch or two away so the board is held tight, set or remove the old fastener, then cover the area with compound, sand it flat and prime. Painting over a pop without securing the board brings it back.
Hairline cracks at seams and corners
Thin cracks that follow a taped seam, or run into the corner where two walls meet, are the most common complaint in Texas homes. The seam tape and compound are rigid, and the framing behind them is not. Repair means opening the crack slightly with a knife, applying a flexible paintable filler or fresh tape and compound, and sanding it smooth. If the crack returns in the same place each summer or spring, see clay soil and cracks.
Dents and small holes
A dent from a door handle or a screw hole from a shelf bracket takes compound alone: two thin coats, sanding between, then primer and paint. Heavy-handed filling is the usual mistake. Thin coats feathered wide are almost invisible, while one thick coat leaves a visible hump.
Larger holes and cut-outs
Holes the size of a doorknob can be bridged with a self-adhesive mesh patch or a small rigid patch with paper-faced edges, then covered with compound. Bigger openings, such as where a plumber or electrician cut into the wall, are repaired by cutting a clean rectangle, fastening backing strips to the framing, and installing a piece of board of the same thickness. The seams are then taped and finished like new work. See drywall basics for thickness.
Finishing the patch so it disappears
The patch is only half the job. A repair on a smooth wall needs two or three thin coats, wide feathering, light sanding and a coat of primer. On a textured wall, the texture has to be re-created, which is where most visible repairs fail. The levels of finish chapter explains which finish level and texture to ask for. Even a perfect patch can show in a raking light if the surrounding paint has aged, so painters often repaint the entire wall corner to corner.
Size, permits and who should do it
Small repairs are routine home maintenance. Larger drywall repairs can require a permit, and the City of Austin's express permit page lists drywall repair above 128 square feet among the projects handled through its one-day process, with a registered general contractor attached. Smoke and carbon monoxide alarms must meet code on work of that kind. For the details and the places to call, read permits and codes.
If the damage came from water, stop and read water and mold. A wet wall that is patched and painted can hide a moisture problem. And if the wall is in a house built before 1978, or has an old textured ceiling, older homes covers the checks to make before any sanding.
What a good repair looks like
A finished repair is flat, painted to match, and invisible when you look along the wall in raking light. Nail pops do not return because the board is held tight. A recurring crack has dated photos beside it, so you know whether it moved. That is the outcome to ask for.
A short repair checklist
- Find the cause: a pop, a seam, impact damage or water.
- Secure the board before filling anything.
- Use thin coats and sand between them.
- Prime the repair before paint, and match the sheen.
- If the same crack returns, document it with dated photos and read the next chapter.
Questions people ask
Can I fill a hairline crack with caulk and paint?
A paintable flexible filler can hide a seam that moves a little with the seasons, but if the crack keeps coming back it is telling you something. The chapter on clay soil explains why Central Texas walls move, and when a recurring crack deserves a closer look.
What causes nail pops?
A fastener head pushes out through the compound when the framing dries and shifts, or when the screw was not set tightly. The fix is to drive a new screw nearby, set the old one below the surface and recoat.
How big a hole can be patched without replacing a sheet?
Small dents and fastener holes take compound alone. Doorknob-size holes are patched with a bridge of mesh or a small board cut to fit. Larger holes are usually repaired by cutting out and replacing a piece of board, with new tape and compound at the seams.
Do I need a permit to repair drywall?
The City of Austin lists drywall repair above 128 square feet among the minor repairs that can use its express permit. Ask the city about smaller jobs, and read the permits chapter.
Why does the paint look different over a patch?
Joint compound absorbs paint differently from the painted wall around it. A coat of primer over the patch before the finish paint is the normal cure, and a matching sheen helps.
Sources: [1] austintexas.gov [2] certainteed.com