Larkspur Polished Concrete Floors

A polished floor is settled long before a grinder rolls through the door. It's settled at seven in the morning on pour day, when a truck backs up to a walkout and the crew has one shift to place a slab that has to still look right after diamonds run across it. Grind a slab somebody placed carelessly and you spend the whole job fixing a problem you didn't create.

So here's what pour day looks like when polishing is the plan. Different mix ticket. Different placement discipline. Different finishing, different cure, different joint layout. None of it exotic. All of it decided in advance instead of discovered later.

You can tell in the first pass with the metal-bond diamonds whether anybody was thinking about polish on pour day. The floor either opens up even across the room, or it's high here and low there and you're grinding half of it down into the rock just to catch the rest.What the crew sees on site

Pour day, from the first truck to the last pass

We set the vapor barrier and the base, then we place the whole floor in one continuous run. That's not a preference, it's the only way to keep color and hardness matched corner to corner, because a cold joint in a floor you intend to polish is a line you'll see forever. Screeding gets more attention than a normal slab gets. Every high spot is aggregate you didn't ask to see, and every low spot is cream that never gets touched.

Then the timing game. We wait out the bleed water instead of troweling it back in, take even passes at even intervals, and stop before the surface gets burned. Overworked patches turn dark later, and no amount of grinding brings them all the way back. Joints get laid out on a drawing rather than wherever is convenient, cut on time, and filled later with a semi-rigid filler so the finished floor reads as one surface.

A standard slab against one poured to be polished

How much stone you want looking back at you

This is the choice that changes everything else. Leave the surface as poured and you get a cream finish: no rock, just the smooth top layer, the softest look and the least grinding. Take a little off and you get the speckled salt-and-pepper most people picture. Go deeper and the full aggregate shows, and the floor turns into something closer to terrazzo.

Depth is the honest constraint. We can only expose what the slab has, evenly, if the slab is flat. On a floor that rolls, chasing full aggregate means grinding the high areas down until the low ones catch up, and now you're removing a lot of concrete to satisfy a look. That's why we push the flatness conversation to pour day. After that the floor votes and we listen.

The grit sequence itself is routine once those calls are made. Metal-bond diamonds first to open the surface, densifier applied mid-sequence to harden the paste, then resin diamonds stepping finer until the sheen you picked shows up. Skipping a step doesn't save time. It just leaves scratches that the next grit can't remove, and they show under a low sun.

Why we keep the diamonds indoors, and where the work is

Polishing belongs inside, and we'll say that plainly even when somebody wants a shined patio. A polished exterior slab at this elevation gets slick when wet, loses its refinement to freeze-thaw within a few winters, and gives up its densified surface to the same ultraviolet that eats sealers. Outside, we'd rather give you a washed or broom finish that works in January.

Inside is a different story, and Larkspur has plenty of it. Walkout lower levels around Perry Park where the slab has been under carpet for decades. Detached shops and barns at Sage Port where a floor takes tools, trucks, and firewood dust. New builds at Bear Dance where we can get involved early enough to pour the floor the right way the first time. Interior work runs all twelve months, which makes it the thing we schedule when the ground outside is frozen solid.