Drywall Patch and Texture

Two Surfaces, Two Repairs, One Wall

We get called about drywall patching constantly in Pasadena, and a fair share of the time the wall in question is not drywall. That is not the homeowner’s fault. Painted over and lit from the front, a plaster wall and a board wall look identical. They only separate under a knuckle, at a light switch opening, or when somebody tries to repair one of them using the method for the other.

So this service covers both, because in practice a house hands us both. What changes between them is the technique, the material and the time.

How We Patch Board

A drywall repair is a known quantity, and the reason it goes wrong is almost always that a step was skipped rather than that it was hard. We cut the damage back to a clean square, put backing behind the opening so the patch has something to fasten to instead of floating on tape, screw in a piece of board of the same thickness, tape the perimeter, then build three coats out over a wide feather.

The feather is the part people cut short. A patch built up in a narrow band around the cut sits as a visible mound on the wall no matter how well it is sanded, because the eye reads the change in plane, not the change in texture. Wide and thin beats narrow and thick every time. Then it gets sanded until the back of a hand cannot find the edge, checked with a light held flat, and sanded again wherever the light disagrees.

Nail pops get re-fastened with a screw a couple of inches away from the failed fixing before they are filled. Filling a pop without adding a fastener puts the same bump back on your wall within about a year, and everybody who has ever tried it knows this.

How We Patch Plaster

Plaster repair starts one step earlier, with the question of whether the surrounding wall is even attached. Behind a lath and plaster wall, the first coat was pushed through the gaps between the wood lath strips so it curled over the back and locked the whole thing on. Those curls are the keys, and they are what fails. When they snap off, a section of plaster is sitting there held by friction and habit.

Where there is sound lath behind it, we pull that field back tight with plaster washers and screws, which is a fast and genuinely durable repair and is invisible under the finished coats. Where the plaster has crumbled or the lath itself is broken, we cut back to a sound edge, put board or a base coat in to bring the depth up, and rebuild the face in setting compound. Deep repairs go on in layers with drying time between them, and that time is not negotiable in the way a schedule sometimes wishes it were.

Cracks get sorted into two piles. A fine map of surface crazing is cosmetic and takes filler. A crack running on the diagonal off a door or window corner is the building moving, and it needs to be opened out, taped with mesh or paper bedded into compound, and built back. Otherwise the filler is the only thing holding the joint and it will split along the same line again.

Matching the Texture

This is the part that decides whether the repair is invisible or merely tidy.

Original finishes in these houses were applied by hand. Sand float gives a fine even grain from a float loaded with sand aggregate. Skip trowel leaves flat islands where the blade skimmed the high spots and left the low ones. Later remodels brought in spray applied textures such as orange peel and knockdown, so a single house can carry three or four distinct finishes room to room.

We match by hand with the same class of tool that made the original, on a sample board first where the finish is unusual, and we let it dry before judging it. Wet texture always looks heavier than it will read once it is dry and painted, and a match approved while wet is usually a match that ends up too coarse.

Where the surrounding wall is so crazed or so patched that matching is a losing exercise, we will say so and quote a full skim instead. A skim gives a uniform surface and no guesswork, but it also removes the hand troweled character of the room, so we treat it as your decision rather than ours. Plenty of owners choose it for a back bedroom and refuse it in the living room, which is a perfectly sensible way to spend the budget.

Priming a Repair Before It Is Painted

A finished patch is not ready for finish paint. New compound and new plaster are far more porous than the aged, sealed wall around them, and if they are not spot primed the topcoat sinks into them and dries to a different sheen. You end up with a wall that is uniform in color and blotchy in gloss, which is more noticeable than the original damage was.

On pre-1978 houses there is one more step before any of this. Paint of that era can contain lead, so nothing gets dry sanded or dry scraped open until it has been tested, and where the result is positive we switch to wet methods, containment and proper waste handling, or we leave the layer sealed and work over it.

Call (626) 974-4505 and we will come and tap the wall.