Lone Tree Concrete Overlays

Every overlay question is really a soil question. You're asking us to bond a new wearing surface onto concrete that's already sitting out there, and that concrete is only as steady as the base beneath it and the several feet of Douglas County ground beneath that. If the dirt is moving, the slab is moving, and a topping simply comes along for the ride.

So the first thing we do on these calls is ignore the surface entirely. Where does roof water land. Has the slab tilted back toward the house. Has one panel dropped below its neighbor. Twenty minutes of that decides the project, and the color conversation waits until we know there's something worth topping.

Reading the ground before reading the slab

Concrete tells you about the soil under it if you know where to look. Panels flush at every joint mean the ground beneath is behaving the same way everywhere. A lip at one joint means half the slab went somewhere the other half didn't. Cracks parallel to the house tend to be edge settlement. Cracks wandering diagonally across a panel usually came from a void.

We tap it too. Concrete sounds different over solid base than over air, and once you've heard both you can map a hollow in a minute with a hammer handle. A hollow means water has been washing fines out from underneath. Topping over that is a paint job on a leaky roof.

The site walk, in the order we do it

• Downspouts and where they actually discharge, not where they were designed to
• Grade at the slab edge: does water leave the house or collect against it
• Joint faces checked for vertical offset between panels
• Sound test across the whole surface for hollows and voids
• Existing sealer or coating identified, because bond depends on getting it off
• Irrigation heads and drip lines running near or under the slab edge
• Slab thickness checked at an exposed edge, and whether any steel is in there

What we find underneath, and whether a topping survives it

Bond prep, thickness, and where the limits sit

Once the ground checks out, everything rides on bond. We open the old surface mechanically, grinding or shot blasting until it has real tooth and no trace of sealer, curing compound, or paint. Then vacuum, wet it to a saturated surface-dry state, and scrub in a bonding slurry right ahead of the topping. Skip a link in that chain and the overlay comes off in sheets the first spring.

Thickness is the other limit. Micro-toppings live around an eighth of an inch and carry color and texture only. Stampable and self-leveling systems run a half inch to a couple of inches, which is thick enough to rebuild slope. Past two inches you're pouring a thin slab on an old one, and a thin slab with no base of its own is something we won't sell.

Drainage, freeze-thaw, and picking the season

Correcting drainage during an overlay is one of the better values in this trade, since you're already committed to resurfacing and the extra thickness at the low end costs material rather than a whole project. A Carriage Club patio pitched a quarter inch back toward the foundation can be walked out to positive fall using nothing but the topping. That slab was feeding water to the soil tipping it.

Exterior timing runs May through September, and we'd point you at the shoulder months inside that range. A quarter-inch topping has almost no mass, so it gains and loses heat fast, and a hot windy afternoon flashes the surface before it knits. Cold is worse. One freezing night on a young topping leaves a crumbling layer nobody can patch invisibly.