Concrete patio resurfacing in Florida: the options, and how to choose

Concrete patio resurfacing can mean anything from a can of stain to a new layer of concrete, and which one suits your patio is decided by three things rather than by the brochure: whether the slab underneath is sound, how much height the door threshold leaves you, and where the rain goes when it runs off. Get one of them wrong and even the best option fails.

We install one of those options ourselves, Shellcrete by SRQ Modern, a poured topping of the concrete with the shells in it. This guide covers the others as well, because on plenty of patios one of them is the better call.

What are the options for resurfacing a concrete patio?

From the lightest touch to the heaviest, these are the ways a tired patio slab gets a new face without being broken out:

• Clean and seal: a pressure-wash and a penetrating sealer. On a slab that is only grubby, it is sometimes all the patio needed.
• Stain or dye: colour soaked into the top of the concrete. It adds no thickness, and it shows every patch, crack and old repair underneath, because it tints the surface rather than hiding it.
• Paint and film coatings: acrylic or epoxy rolled on as a layer. Quick to put down, held on by adhesion alone, and the first thing to peel wherever water gets behind it.
• Thin overlays: a polymer-cement skim, a sprayed knockdown texture or a stamped overlay. They change colour and texture while adding little height.
• A bonded topping: a layer of real concrete, thick enough to carry its own aggregate, bonded to the prepared slab and finished like new concrete. Ours is an inch and a half to two inches of white Portland cement, sand and crushed shell, mixed on site by our own crews.
• Pavers or tile over the slab: units laid on a bed over the old concrete. The slab becomes a base, and the patio comes up by the paver or tile plus its bed.

Replacing the slab is the seventh answer, and the next section is how to tell when it is the only one.

Start with the slab: can your patio be resurfaced?

Every option on that list is only as good as the concrete it sits on. A stain soaks into it, a coating sticks to it and a topping bonds to it, so a slab that is still moving takes the new surface along with it.

A patio that can be resurfaced has cracks that are fine and flat, with neither side higher than the other. It sounds solid when you knock on it with a screwdriver handle, nothing has sunk at the corners, and water does not vanish into gaps along the edge. What has worn out is the face: stained, faded, flaking, or crazed with a web of hairlines.

One that needs more than a surface has a crack you can catch a fingernail on, a section that has dropped toward the lawn or tilted toward the house, or a panel that rocks. Tree roots are the usual cause on a patio, and no new surface fixes a slab they have lifted. Raising a settled slab is a separate trade, and not ours. A slab broken into moving pieces, or sitting on ground that has washed out, comes out, and any new patio, ours or anyone else's, starts from a new base.

If the patio is pavers already, it is not a slab. Units on sand come up before a topping goes down, and a base goes in under it.

How much height does each option add at the door?

This is the question that rules options out fastest on a Florida patio, because most patios run straight to a sliding door. The threshold is fixed. Whatever goes on the patio has to finish below it and still slope away from it, or rain blown against the glass runs indoors instead of off the slab.

Stain, sealer and paint add nothing you could measure at the door. Thin overlays add a little. A bonded topping raises the patio by its own thickness, an inch and a half to two inches for ours, and pavers or tile on a bed raise it by more. So measure the gap between the slab and the underside of the threshold before you fall for any of them. It takes a minute with a tape measure.

Where the gap is too tight for a topping, the honest answer is one of the thinner options, or taking the slab out and pouring the new one lower. We measure the slab, the door and any steps on site before a number is quoted, so this is settled before the pour rather than discovered during it.

Where does the water go on a resurfaced patio?

A patio has to shed rain away from the house and toward somewhere it can go: a lawn, a planting bed, a drain. Plenty of older slabs do this badly, holding a puddle by the door or draining into the foundation planting, and the thin options inherit that fall exactly as it is. Stain or paint on a patio that ponds gives you a patio that still ponds, now with a film that lifts where the water sits.

A topping is the one resurfacing option that can correct the fall a little, because it is placed and screeded like new concrete. How much it can correct depends on what the threshold and the edges allow. Past that point the answer is a drain or a new slab, not a better surface.

Shade brings a second water problem. A covered patio stays damp long after a storm, and joints, grout lines and porous faces give algae somewhere to start. A continuous sealed surface gives it far less to hold onto, which is the case the page on lanais and balconies makes for a poured floor under a roof.

Which patio resurfacing option fits which patio?

Put the three tests together and most patios sort themselves:

• Sound slab, good fall, only the look has gone: stain or a penetrating sealer is the light answer, and a topping is the full one if you want a different surface rather than a different colour.
• Sound slab, old coating peeling: the coating comes off first whatever goes on next, because nothing bonds well to a film that is already letting go. A fresh coat over it fails the same way.
• Sound slab with room under the threshold: a topping or a thin overlay. A topping carries real aggregate, so its texture is in the material. A thin layer has no room for coarse aggregate, so its texture is whatever the applicator puts on top.
• Slab cracked through, sunk or lifted by roots: no resurfacing option, ours included. Deal with the slab first.

Concrete patio resurfacing ideas with a shell topping

If a topping is the answer, nearly every part of the look is open again, and every one of ours is custom. The base colour is picked from a sample, the shell blend is settled with you, and because shells are natural the finish varies from one pour to the next. A pale base reflects more of the sun than a dark one, which counts on a slab you cross barefoot in August.

The finish follows the use. A terrace that holds a dining table wants a honed finish, ground flat and matte, so a chair sits without rocking and slides back without catching. A path through the sprinklers wants exposed shell, where the shell standing proud of the surface gives the grip. One pour can carry both, changing at a joint line where the use changes, and the patios and walkways page shows how that plays out across a property.

Joints can become the pattern rather than an afterthought. The old slab will keep moving at its joints, so they are cut up through the new surface in the same places, and borders and panels can be drawn around that grid. A courtyard laid on a diamond grid takes the idea further, with slabs turned forty-five degrees to the walls and turf running between them.

Looking after a resurfaced patio

Whichever option you choose, the sealer matters. A film-forming, wet-look sealer is smoother than the surface under it, so a patio that gripped when wet turns slick, and in Florida sun the film clouds and lifts. A penetrating, breathable, matte sealer keeps the texture. Ours is resealed as needed, and we say so before the deposit. In between, hose it off, clear leaves and berries before they stain, and never put muriatic acid on a shell surface: it eats the shell faster than the cement around it.

What to do next

Before anyone visits, take four photos: the whole patio from as high as you can safely get, the worst crack with a coin beside it, the door threshold with a tape measure standing on the slab, and wherever water sits after rain. The one figure we publish, and what pushes a quote up or down from it, is in the pool deck resurfacing cost guide, and the guide to concrete overlays goes further into how a bonded layer behaves on an old slab.

Send us photos of your patio for a quote, or call (941) 253-0400. We will tell you whether the slab can take a topping, or which lighter option would suit it better.