· by Michael Blair, Nashville's Drywall Repair
Plumbers and electricians open walls because that is where the work is, and almost none of them close the wall afterward. Their estimate usually says so in one line near the bottom. The homeowner ends up with a hole that was cut to reach something rather than to be patched, often with a torn paper face, a cut stud edge and sometimes a second hole next to the first where the first guess was wrong. Closing it well starts with a few questions that have nothing to do with drywall.
Before anything goes back
If the work needed a permit, the inspector has to see it before the wall is closed. That is true for a new circuit, a relocated drain and most gas work, and the local codes office (Metro Codes inside Davidson County, the city or county office elsewhere) will not pass something it cannot see. Closing a wall on uninspected work can mean opening it again.
For a leak, the cavity has to be dry. Wet insulation, a damp bottom plate or a stain still spreading on the framing all need time and air, and a fan pointed into the opening for a few days does more than any product. Drywall closed over a wet cavity grows mold on the back face, where nobody sees it until it shows through the paint.
A patch or an access panel
Some holes should not be patched shut. A shower valve with cartridges that will need replacing, a cleanout on a drain line, a junction box that has to stay reachable under the electrical code, or a spot where the same pipe has leaked before are all better served by a removable panel. A plain white panel on the back of a closet wall is cheaper than cutting the same hole again in five years.
Where the opening faces a living room or a hallway, a panel can be framed flush and painted to match, so it reads as part of the wall. Where nothing behind it will ever need a hand again, patch it.
- Shower and tub valves: panel from the room behind
- Drain cleanouts: panel
- Junction boxes: must stay accessible, so panel or a cover plate
- A pipe that has leaked there twice: panel
- A wire run that is finished: patch
Repairing an opening cut in a hurry
The first job is to square it. A trade hole has torn paper, crushed gypsum and edges that wander, and a patch fitted to that shape fails along those edges. Cutting back to clean lines, to the center of a stud on one side if it is close, gives the new piece something solid at the edges.
Wood backing goes in across the opening wherever there is no framing, screwed to the old board from the front. The new piece is cut to fit with a small gap, screwed off, taped with the joints feathered well past the cut, and finished in thin coats. Where the plumber notched a stud, look for the steel plate that should cover the notch; a screw driven into a pipe that runs close to the face is how a patch causes a new leak.
Matching what surrounds it
A patch in a textured wall has to be textured, and one in a smooth wall under a window needs the joints feathered wide enough that raking light does not pick out the square. Either way it gets primed before paint, because new compound drinks paint differently from an old painted surface.
The paint is the part people underestimate. Touching up a patch with the leftover can from the garage rarely matches a wall that has aged for years. Painting the whole wall, corner to corner, is often the only way the repair disappears, and it is worth deciding that before the patch is done rather than after.