Stucco repair in NYC means taking out what has failed and rebuilding it, not covering it. We sound the whole elevation first, cut back past the damage to material that is still bonded, and rebuild in the same number of coats the wall was built in.
Stucco fails in two ways and only one of them is visible. A crack you can see. A section that has separated from the wall behind it looks identical to the rest of the elevation until somebody taps it. On a New York building that has taken water for a few winters, the area that has let go is almost always larger than the area that looks wrong.
As a stucco repair contractor in NYC we start by finding the real edge of the failure rather than the visible one. Everything after that follows from it. You cut back past that line to material still bonded to the substrate, form the edge so the new work locks into the old, and rebuild in the same number of coats. Skip any of those and the repair comes back.
Stucco repair is one of four different jobs that all get called repair. Which one you need changes the price by a large multiple, so it is worth establishing first.
Tap the wall with a knuckle or a screwdriver handle. What it sounds like tells you most of it.
The stucco has separated from the NYC wall behind it. That is stucco repair. The affected section comes out and gets rebuilt.
Water is arriving from behind the stucco. That is repair too, and on a NYC wall the source has to be dealt with before anything goes back on.
The wall is still bonded and only the surface has split. That is stucco crack repair rather than this.
Chips, dents and small shallow damage on an otherwise bonded wall belong with stucco patching.
Once roughly a third of a wall has let go, cutting out sections costs more than taking it all off. That becomes stucco removal and replacement.
Four things separate a repair that holds from one that comes back in two years.
On a NYC elevation the bonded edge is always further out than the visible one. Cutting to what looks damaged leaves a rim that has already let go, and the stucco repair fails along that rim first.
A square cut edge gives the new material nothing to lock into. The edge is undercut so the stucco repair is mechanically held rather than relying on adhesion across a straight joint.
Filling a three coat stucco repair in one pass puts material of a different thickness and density next to the original. It cures differently, moves differently, and the outline shows within a New York season.
Where the failure came from water, the flashing, sill or joint that let it in is dealt with before anything is rebuilt. Otherwise the stucco repair is a new surface over a source still running.
Tapping across the full wall at close spacing, not just around what is visible. Hollow areas read differently under the knuckle and they frequently extend well past anything showing on the surface.
The hollow area is chalked, and the cut line is set outside it into material that sounds solid. Cutting on the boundary rather than beyond it is the single most common reason a NYC stucco repair fails at its own edges.
An estimate given from a picture is a guess, because the photograph shows the visible damage and the map shows the actual one. On a large elevation those two areas are routinely different by a factor of two or more.
Two numbers and one drawing. The area actually sounded, which is what was surveyed rather than what was visible. The area being cut out, which should be larger than the damage you can see and not the same as it. And a marked elevation showing where those areas are. A quote that gives one price for repairing a wall, with no survey behind it, is pricing a photograph. It will either come in high to cover the unknown or come in low and change later, and both of those cost you more than the survey would have.
Failures concentrate in the pre-war stock, which is spread unevenly across the boroughs and behaves differently in each.
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By cutting out what has failed and rebuilding it. The NYC wall is sounded to find the real extent, the failed section is cut back past its edge to bonded material, the edge is undercut so the new work keys in, and the area is rebuilt in the original number of coats.
Tap it. Sound stucco gives a solid note and material that has separated from a NYC wall sounds hollow even where the surface looks perfect. Staining, soft spots and bubbling paint point the same way. A crack alone does not, since a cracked wall can still be bonded.
It depends on area rather than on difficulty, and the area is usually larger than it looks. Sounding an elevation regularly finds two or three times the failure that is visible. Anyone pricing NYC stucco repair from a photograph is either covering that uncertainty or about to discover it mid job.
The same materials the wall was built from, matched rather than substituted. Portland cement stucco gets a cement based mix. A pre-war New York lime wall needs a lime based mix so the repair stays softer than the original, since a harder modern material forces the failure into the old work.
Usually yes, and that is the normal outcome. Sections are cut out and rebuilt while the sound wall around them stays. The point where that stops making sense is around a third of the elevation, beyond which cutting out individual areas costs more than removing the lot.
Almost always at the edges, because the cut was made at the visible damage rather than past it. A rim of debonded material left around a NYC stucco repair takes the new work with it. The second cause is water that was never traced.
