Worked case: a 3-car polyaspartic flake garage floor in Black Diamond Estates — what happens and what it costs

The scenario

The home is a larger single-family house with a three-car garage that includes a small workshop bay. The slab is a few decades old and carries several hairline cracks. The household wants a one-day style system because the garage is the only place to park during the work.

The moisture test reads higher than the data sheet allows in one corner, which changes the plan: a vapor-barrier primer goes down first and the polyaspartic top layers wait for it.

The installer plans the work in two passes to keep each batch inside the short mixing window.

The household has a motorcycle and a small trailer that live in the third bay. They want the floor to take a kickstand and tire marks without scratches, and they want the whole garage back within a few days because the family cars have nowhere else to park.

The installer also sketches the pass lines on the floor with chalk before any mixing begins: where one batch ends, the next begins, and how the flakes will be broadcast so the seam between two batches does not show in the finished surface.

What the job involves

1. The household empties the garage and the installer lays out the pass lines so they fall at the workshop bay and the door tracks.
2. A dust-shrouded diamond grinder grinds the whole slab, and cracks are cut, filled and ground flush.
3. Moisture is tested with calcium chloride kits and in-slab humidity probes; the high corner prompts a vapor-barrier primer.
4. At dawn, the primer is applied and a thin pigmented polyaspartic base follows in small batches.
5. Flakes are broadcast by hand into the wet base to the chosen coverage.
6. A polyaspartic clear top coat is rolled over the flakes and the garage is ventilated until the data sheet allows foot traffic and vehicles.

Materials and prep

• Dust-shrouded diamond grinder and HEPA vacuum
• Calcium chloride kits, in-slab humidity probes, crack filler
• Vapor-barrier primer, pigmented polyaspartic base and clear top coat
• Vinyl flakes, rollers, scrapers and spiked shoes

Add-ons often paired with this job

• Extra crack or joint repair (per repair area) — +$50–$200. A wider crack is priced as a separate repair area.
• Coat the stem wall (garage-door threshold wall) — +$150–$400. The threshold wall at the door can be coated in the same system.
• Custom flake blend — +$100–$300. A custom blend is a separate line.

Why it is done this way

Polyaspartic is less forgiving of damp concrete than a patient epoxy base, which is why the moisture test comes first and the primer is part of the price. Many polyaspartic systems can be installed in one day, but the time before a vehicle returns is set by the product's data sheet.

A three-car floor is also a long pour: the work plan, not the speed of any one roller, decides how it goes.

A three-car floor is also the case where the moisture primer earns its place. A corner that tests high can be a drainage or irrigation issue on the outside, and the household is told to look at the grading and the downspouts as well, since a coating cannot fix a source of water.

The finished surface is a high-gloss polyaspartic over flake. The household is told that a gloss floor shows dust and footprints more plainly than a satin one and that a satin top coat is an option.

What would change the price

• The moisture test reads normal everywhere and the primer is dropped.
• A crack shows one side higher than the other and needs a concrete professional.
• The workshop bay is switched to solid color with grit.
• An old coating covers part of the slab and adds removal.
• The garage is a four-car at 840 square feet.