Stucco Contractors in Port St. Lucie, FL

What the Treasure Coast climate does to stucco

Most houses in this part of Florida are concrete block with a cement stucco skin over the block. That stucco is not decoration. It is the weather layer of the wall, and here it works hard. Salt air, heat, constant humidity, and wind-driven rain during storm season all land on the same surface.

Block and stucco move slightly as they heat, cool, and take on moisture. That movement shows up as fine hairline cracking, and by itself it is normal. What is not normal is a crack that keeps opening, a hollow sound when you tap the wall, or staining that bleeds back through fresh paint. Those signs point to water getting behind the stucco. Once water is back there, it does not dry out on its own in a humid climate.

• Fine map cracking across a large wall field
• Cracks running diagonally out of window and door corners
• Hollow or drummy spots when you tap the surface
• Paint blistering, bubbling, or peeling in patches
• White chalky residue bleeding through the finish
• Rust staining at lintels, corner bead, or fasteners
• Soft or crumbling stucco near the bottom of the wall

Stucco repair: hairline cracks and structural cracks are not the same problem

Hairline cracks are cosmetic. They usually come from shrinkage during the original cure or from normal thermal movement. They get cut out, filled, blended into the surrounding texture, and coated. That is a straightforward repair.

Structural cracks are wider, they follow a line, and they often step down along the block joints or run at an angle from an opening. Those are telling you something is moving or something is wet. Filling one without dealing with the cause buys a season and then reopens in the same place. We read the crack pattern first and tell you which one you have.

Where the substrate is sound, we cut back to solid material, patch in coats, and match the existing texture. Where a wall has failed over a large area, we will say so and price a re-coat instead of selling a patch we already know will come back.

Restucco, re-coat, and elastomeric coatings

When a wall has cracking everywhere instead of in one spot, patching stops making sense. A restucco or re-coat puts a new finish over the whole elevation so the texture and color are uniform and there is no patchwork showing through the paint.

Elastomeric coatings get talked about a lot in Florida, and they do have a place. They build a much thicker film than standard house paint and they can bridge fine hairline cracking, which is why they hold up on block walls. They are not a cure-all. Applied over a wall that is delaminated or actively taking on water, elastomeric traps the moisture instead of solving it.

• Good for hairline cracking on a sound, well-bonded wall
• Builds a thicker, more flexible film than standard exterior paint
• Not a fix for structural cracks or hollow, delaminated stucco
• Needs a clean, dry, properly prepped surface to bond
• New stucco has to cure before any coating goes on

New stucco and the three-coat process

Traditional stucco goes on in three coats, and each one has a job. Rushing the sequence or skipping the cure is where most premature cracking comes from.

On block, the first coat bonds directly to the masonry. On frame walls, lath goes over the sheathing and weather barrier first, and the first coat keys into that lath. Either way, the wall needs time between coats and needs to be kept damp while it cures. In this heat, a wall that dries too fast cracks.

• Scratch coat. The bond coat. It is scored so the next coat grips it.
• Brown coat. The thickness and the flat plane. This is the coat that makes the wall straight.
• Finish coat. The texture and the look, matched to the rest of the house.
• Cure time. Kept damp and given time before paint or coating goes on.

Stucco over block, stucco over frame, and EIFS

Most of what we touch here is cement stucco over concrete block. Block is the standard wall assembly for Florida homes, and stucco over block is the most durable version of this work when it is done right.

Frame walls are a different detail. Stucco over wood or metal framing needs a weather-resistive barrier and lath behind it, and the flashing at windows, doors, and roof-to-wall transitions matters more than the stucco itself. Most water problems on frame walls start at a detail, not in the field of the wall.

EIFS, sometimes called synthetic stucco, is a different system entirely. It is foam board with a thin acrylic finish over a mesh, not cement over masonry. It looks similar from the street but repairs, drainage, and impact resistance all behave differently. If you are not sure which one you have, tapping the wall usually tells the story. EIFS sounds hollow and soft. Cement stucco over block sounds solid.