Local guide

Stucco Repair in Sebastian and the Indian River Lagoon

In Sebastian almost every stucco repair traces back to the lagoon. Salt corrodes the metal buried in the wall, and the coarse original sand finishes take real effort to match.

Sebastian is Indian River County, and that changes more than the drive

Sebastian sits on the west bank of the Indian River Lagoon, north of Vero Beach and well past the St. Lucie County line. For a homeowner reading advice written for Port St. Lucie, two practical things are different. Permitting and inspections here are administered by the City of Sebastian or Indian River County rather than by Port St. Lucie or Fort Pierce, and the housing stock is its own animal.

Much of the residential ground was platted long before it filled in, so one street can hold a 1970s block ranch, a house from the 1990s and something finished last spring. There is no single Sebastian house, and a quote given over the phone from a description of the street is worth nothing.

What is consistent is the water. The lagoon is right there, canals run back into the neighbourhoods, and the inlet is up the road. Salt is the thread running through nearly every repair in this town.

Lagoon salt is not a weaker version of ocean salt

Homeowners on the river side often assume they are in the mild zone. On a wall it does not work out that way. Chloride travels on the wind off open water, and the lagoon is open water with a long fetch across it. Houses on canals collect it, and so do houses several streets back, because the breeze carrying it does not stop at the second row.

There is a second source people forget. Irrigation. Shallow well water in this part of the coast can carry enough mineral to stain a wall orange and to leave the base of the stucco wet every single morning. A sprinkler head that has been throwing water at the same corner for a decade does more damage than any storm has.

Cement plaster itself copes with salt reasonably well. The metal inside it does not, and that is where the repair work in Sebastian concentrates.

The metal inside your walls, and the order it gives out

A stucco wall is not only cement. It contains accessories that shape it, terminate it and hold it, and most of those are steel. Corner bead runs the full height of every outside corner. Casing and stop beads finish the edges at windows, doors and soffits. A screed or stop sits at the bottom of the wall. Any framed area, whether a gable end, a Florida room or a later addition, is built over wire lath fastened back to the framing.

Corrosion works through them in a fairly predictable order, and knowing it tells you where to look on your own house before anyone else does.

• The base of the wall, wherever sprinklers or splash keep it damp
• Corner bead on outside corners, worst on the elevations facing the water
• Casing and stop bead around window and door openings
• Wire lath and its fasteners on gable ends and frame additions
• Steel inside a precast lintel over an opening, which shows as a horizontal line

Reading rust before the wall opens itself

Rust jacking gives plenty of warning if you know its handwriting. A crack that is suspiciously straight and follows a construction line instead of wandering. A raised edge you can feel by dragging a flat palm across it. Brown or orange staining bleeding downward out of the line. A dull, hollow note when you tap either side of it with a knuckle or a screwdriver handle.

Two of those together is reason enough to have the wall sounded. All four means the metal has already swollen and the repair will be bigger than the crack suggests, because the damage runs as far as the corrosion does.

The thing that never works is sealant. Caulk over corroding steel changes nothing about the reaction underneath it. The same line reopens, usually wider, often within a couple of seasons. It is the most common piece of wasted money in coastal stucco.

Doing a corrosion repair once

The work itself is not complicated, but the order is not optional. Remove plaster back past the corroded metal until sound material and sound accessory remain. Take the damaged bead or lath out instead of burying it again. Clean and treat any steel that has to stay. Fit new accessory, lap and tie new lath properly into the existing, then rebuild the coats and let them cure before finishing.

Replacement material is worth a direct question this close to salt water. Standard galvanised bead is the default and it is what most walls here already have. Stainless and PVC accessories cost more, do not corrode, and are a reasonable trade on a lagoon front elevation. ASTM International publishes the consensus standards this trade works to, with ASTM C926 covering application of portland cement plaster and ASTM C1063 covering installation of lathing and accessories. Asking a bidder which they build to is a fair question and a revealing one.

Anything short of that sequence is a cosmetic patch laid over an active reaction, and the wall will make that clear on its own schedule.

Matching a coarse original sand finish

Older Sebastian houses often wear a coarse sand or dash finish with visible aggregate, thrown or sprayed and left alone. Newer crews are generally quicker with a fine sand or a knockdown, and that is exactly why a poor patch stands out here. Set a fine texture beside a coarse one and the eye finds the line from the street even when the colour is perfect.

Matching means matching the sand, not only the technique. Aggregate size, how wet the mix is, whether it is hand thrown or gunned, and how hard it is knocked back all change the result. It takes samples on a board or on a hidden elevation, and it takes looking at them dry rather than fresh.

There is also decades of weather on the original wall. A technically perfect new match often reads slightly too crisp beside it, which is one good reason to coat a full elevation after a large repair instead of leaving an island of new work in the middle of an old wall.

Hiring for a Sebastian job without surprises

Ask what happens when the wall opens up worse than expected, because on a corroding coastal wall it sometimes does. A contractor who works this stretch of coast will already have an answer and a rate for it rather than a shrug.

Confirm who is pulling permits and with which office, since Sebastian addresses are not administered by the same building department as Port St. Lucie, and different scopes are treated differently from one jurisdiction to the next. Then fix whatever is wetting the wall while the crew is on site. Moving a sprinkler head is the cheapest line item on this entire page and it decides how long the rest of the work lasts.

• A written policy and rate for corrosion found past the marked area
• Which accessory material is going back in, and the reasoning behind it
• Whether sand and texture get sampled and approved before the wall is finished
• Coating scope: patch area only, or the elevation corner to corner
• Who confirms permitting with the local building department, and when
• Irrigation, gutters and splash corrected as part of the same visit