Stucco Cracks in Brevard County: Which Ones Actually Matter

Most stucco cracks on Brevard County houses are cosmetic. Not all of them. The difference comes down to three things you can check yourself in about ten minutes: how wide the crack is, which direction it runs, and whether it is moving.

The short answer

A cosmetic crack is in the stucco. A structural crack is in the thing behind the stucco, and the stucco is just showing you where it is.

Stucco is a thin, rigid skin over something else — concrete block, usually, in this county. It shrinks as it cures and moves with temperature, so it is going to crack. What is not normal is the wall behind it moving, or water getting in and staying there.

Four signals separate the two:

One signal on its own is worth watching. Two or more together is worth having looked at.

The pencil test: is it moving?

This is the most useful thing on this page and it costs nothing.

Draw a short pencil line across the crack — perpendicular, crossing it — and write today's date next to it on the wall. Do this at the widest point, then leave it 30 days. If the two halves still meet up, the crack is not moving. If they have pulled apart, even by a hair, something behind it is still shifting.

That matters more than width. A 1/8-inch crack that has been 1/8 of an inch for years is settled. A 1/16-inch crack that opened another 1/32 in a month is a wall still going somewhere.

Use pencil, not marker, and treat 30 days as the minimum — a reading spanning a season change is better. A contractor in your driveway cannot tell you whether a crack is moving. Only time can, and you are the one who has the time.

On width, sources disagree: some set the line at 1/16 of an inch, Angi among them, others at 1/8. Since almost nobody owns a crack gauge —a dime is about 1/16 of an inch, a quarter a bit under 1/8. If a dime's edge will not enter, you are in hairline territory.

Why hairline cracks are so common here

Stucco shrinks as it cures, and bonded to something that does not shrink — concrete block — that stress is relieved by fine cracking across the surface. The Florida Lath & Plaster Bureau publishes a technical bulletin on exactly this. The cracking is the pressure release valve, and Florida heat makes it worse: our summers pull water out of curing stucco faster than it should leave. That is why new houses crack and their owners panic.

Control joints matter too. Code says a panel over block should not exceed 144 square feet without one. Where they are missing or too far apart, the stucco makes its own — so a long unbroken wall with regular vertical cracking is usually an installation issue, not a structural one.

Why a crack in Brevard is not a crack in Phoenix

Search this topic and you get good articles from contractors in Arizona, California, and Pennsylvania. They are not wrong. They are writing about a different wall.

Most of our houses are stucco over concrete block. This is the most important distinction and almost nobody mentions it. Stucco bonded to block sits on a solid, stable substrate. Stucco over wood frame goes over lath, a water-resistant barrier, and sheathing: more layers to fail, more consequence when water gets in. The same crack means different things on those two walls.On block, a vertical hairline crack is usually shrinkage. On frame, it is a path to sheathing that can rot.

Not sure which you have? Rap the wall — block feels dead solid, frame sounds slightly hollow. Block walls are also around ten inches thick and set windows back roughly three inches, where frame walls sit nearly flush. Many Brevard houses are block downstairs and frame upstairs, so check both.

Wind-driven rain changes what a crack costs you. A tropical system drives rain at 30 to 60 miles per hour laterally into any opening rather than down the surface. A crack that would never leak in Phoenix will take on water in a Brevard squall.

Salt air works behind the wall. Near the coast it corrodes the lath, flashing, and fasteners. Corroding metal expands, and expanding metal cracks stucco from behind. Rust staining bleeding from a crack is not dirt.

Ten miles inland in Palm Bay is a different house than a block off A1A in Melbourne Beach, built the same year.

What you cannot tell from outside the wall

Everything above you can determine yourself, with a pencil and a knuckle and thirty days. For most houses here it ends there. But four things no amount of looking will answer:

• How much moisture is in the wall. Staining says water got in once, not whether the wall is wet now or how far it runs. That takes a meter.
• How far delamination runs. A hollow sound says the stucco let go somewhere. The boundary is rarely where the sound changes.
• Whether a diagonal crack is stucco or structure. From outside, a lintel problem, a slab corner that settled twenty years ago, and active foundation movement look identical.
• What is behind synthetic stucco. If your house is EIFS — common on Brevard houses built in the 1980s and 90s — the surface tells you very little. It sounds hollow everywhere and can hide real water damage behind an intact-looking exterior.Worth resolving first, because it changes every other answer here.

What to do next

Hairline, vertical or web-patterned, dry, not staining: you are done. Put "seal and coat" on the list for next time you paint. An elastomeric coating bridges hairline cracks and moves with the wall — apainting job, not a stucco job, and you do not need a stucco repair for it.

Unsure, or between 1/16 and 1/8: mark it, date it, give it thirty days. Free, and it will tell you more than any driveway estimate.

Diagonal cracking from window corners, staining that persists after rain, a hollow or soft area, or a crack that has grown: worth eyes on, and sooner is cheaper. Crack repair runs $8 to $20 per square foot regionally;water damage behind the wall runs $30 to $50 before mold remediation.(Regional Florida figures, not Brevard-specific.) If it is the expensive kind, repair versus replacement is the next question.

If it is the kind that needs work, that is what we do —stucco repair in Melbourne covers cracks, patching, and texture matching. And if it turns out to be the cosmetic kind, that is a real answer, and it costs you nothing.

Frequently Asked Questions

Are hairline cracks in stucco normal?

Yes. Cracks of 1/16 of an inch or less are the most common thing on a wall here. What matters is whether one is growing or staining.

When should you worry about stucco cracks?

When it runs diagonally from a window or door corner, is wider than 1/8 of an inch, stays dark two days after rain, sounds hollow or gives under thumb pressure, or is wider than it was 30 days ago.

What is the difference between cosmetic and structural stucco cracks?

A cosmetic crack is in the stucco; a structural crack is in the thing behind it. Cosmetic cracks are thin, stable, dry, and vertical or web-patterned. Structural cracks are wider, often diagonal, and appear at the corners of openings.

How wide does a stucco crack have to be to be a problem?

Sources disagree — some say 1/16 of an inch, others 1/8. Above 1/8, width has stopped being the useful signal and direction and movement matter more.

Do stucco cracks mean foundation problems?

Usually not. Foundation movement shows as diagonal cracking from openings or stair-step cracking along block mortar joints, usually in more than one place.

Can you just paint over stucco cracks?

Under 1/16 of an inch, yes — elastomeric coating bridges them. Anything wider will split along the same line within a season or two. Caulk first, cure, then coat.