Once somebody has decided to pour a patio or a driveway, the next question is what it should look like. That is a real decision and it is worth making on purpose, because the finish changes how the slab behaves as much as how it looks. Here is how the common ones actually perform.
Broom finish
The most common finish in the trade and the one most often done badly. A broom is dragged across the surface at the right moment to leave a fine directional texture. It grips when wet, it hides a reasonable amount of wear, and it is the most economical thing you can put on a slab.
What separates a good broom finish from a poor one is entirely timing and consistency. Pull the broom too early and you tear the surface, too late and it barely registers. Vary the pressure or the direction partway across and you get streaks that never go away. On a large slab the crew has to stay ahead of the concrete the whole time, which in a Hemet summer is the actual difficulty.
Salt finish
Rock salt is broadcast onto the fresh surface, pressed in, and washed out once the concrete has set, leaving a fine pitted texture. It is common around pools in this part of California for good reason. It grips underfoot when wet, it reads softer than a broom finish, and the shallow pits break up the surface so it does not glare the way a smooth slab does.
The texture depth comes from how hard the salt is pressed in, which is a judgment call made on the day. It is a good looking finish that costs very little more than a broom.
Exposed aggregate
This one reveals what is actually inside the concrete. A surface retarder holds the top paste from setting, then it gets washed back to expose the stone underneath. How much stone shows depends on the retarder and the timing of the wash.
It grips well, it hides wear and staining better than almost anything else because the surface is already visually busy, and it ages gracefully. The tradeoff is that it is texture you feel. Barefoot on a pool deck some people find it too aggressive, and it is harder to sweep than a smooth finish. For a driveway or a walk it is excellent.
Sand finish
A uniform fine texture without the directional lines of a broom. It suits slabs that should not draw attention to themselves, which is more patios than people think. If the point of the space is the furniture, the planting or the view, a sand finish stays quiet underneath all of it.
Stamped concrete
Texture pressed into the slab while it is still open, usually with color worked in at the same time. It is the most decorative thing we pour and the least forgiving to install, because the window where the concrete will take an impression and hold it is measured in minutes. Too early and the mat sinks and closes up. Too late and it will not seat at all.
On a hot inland afternoon that window is short, which is why stamped pours start early and run with enough people to stay ahead of it. Done well it is genuinely impressive. Done in a rush it looks like patterned concrete, which is a different and worse thing.
Two practical notes. Stamped work is sealed, and the sealer is what carries the color depth, so it needs redoing periodically. And control joints still have to go where the slab structurally needs them, so the pattern layout gets planned around hiding those joints rather than fighting them.
Colored concrete
Color is really two separate decisions. Integral color goes into the mix and colors the whole section, so a chip or a saw cut does not reveal gray concrete underneath. Surface applied color sits in the top layer, gives more depth and variation, and lives in the wear layer where it needs maintenance.
Most decorative work uses both, integral for the base tone and surface treatment for the character. If you are choosing one, integral is the durable answer and surface is the expressive one.
Polished concrete
Worth knowing this is not a coating. The slab itself is ground through progressively finer grits until it shines, so there is nothing sitting on top that can peel or delaminate later. It needs a sound slab to start with, and it is mostly an interior finish, but when the concrete is already good it is often the most honest thing you can do to it.
How to actually pick
Start with where the slab is and what happens on it, then let looks decide between whatever is left.
- Gets wet on purpose, like a pool deck. Salt finish or a light broom. Slip resistance is the specification, not a preference.
- Takes vehicles. Broom or exposed aggregate. Both wear well and hide the traffic.
- People look at it. Stamped or colored, where the floor is part of the room.
- Full inland sun. Lighter colors and more texture. A dark smooth slab in a Hemet August is hot enough to be unusable barefoot, and that is a comfort decision worth making before the pour rather than after.
Whatever finish you land on, the slab underneath it is the same job. Base, thickness, steel, joints and curing decide whether it is still flat in twenty years. The finish decides how it looks while it is.