A cracked Kirkland garage slab was moisture tested in five spots, crack repaired and coated in Slate Stone flake polyurea in one December day.
December is not the month most people picture for a garage project. This Kirkland homeowner booked one anyway. The two-car garage had plywood walls, a block stem wall along the back, a few long cracks across the slab and bare concrete that had gone dark and blotchy from years of use. The plan was a floor that would clean up easily and stop looking like a basement.
Our crew installed a garage floor coating in Kirkland with Certified Penntek polyurea in Slate Stone flake in December 2025. The coating went down in one day, and the garage went from grey and stained to bright and even.
Wet season or not, a slab gets tested before we quote a coating. At the free consultation in early December, Nicole took moisture readings in five spots across the floor: 3.9%, 4.1%, 4.8%, 3.7% and 3.7%. The highest number sat right next to one of the cracks, which is common. Water finds the easy path.
A scratch test checked the hardness of the surface, so the crew would know how hard to grind. The cracks were mapped too. None were wide, but they ran a good way across the floor, the kind of lines that show up through paint or a thin coating within a season or two.
About a week after the consult, the crew came back and did the whole floor in one visit:
Winter installs work here because the crew checks slab moisture and temperature on install day and plans around them. Our post on coating concrete in the winter walks through what changes when it is cold out.
Slate Stone Evolution is a light grey blend with darker charcoal and white chips mixed in. In a garage with tan plywood walls and a single window, it bounces the overhead light around and makes the room feel twice as open as the bare concrete did. The pattern is busy enough to hide tire tracks, sawdust and the grit that comes in on wet shoes all winter.
The repaired cracks disappeared under the flake. You would have to know where they were to find them.
A lot of people start out searching for an epoxy garage floor. What we install is Certified Penntek polyurea, and the difference shows up years later, not on day one.
Kirkland runs along the east shore of Lake Washington, and its winters are long and damp. A garage slab here spends months soaking up whatever drips off the car. That is why moisture testing is part of every consult, not an add-on. If a slab reads high, there is a two-layer moisture barrier system that goes down first.
For more on how we work in town, see our page on garage floor coatings in Kirkland. You can also compare this floor with a Kirkland garage we finished in Tidal Wave, a darker blend.
Yes. A garage floor can be coated in the middle of a Kirkland winter. The crew checks slab and air conditions on the day and logs them for the warranty. The crew checks slab and air temperature on install day and gives you walk-on and parking times before they leave.
It depends on the slab and the system, which is why Cascade tests every floor at the consult. On this job the readings ran from 3.7% to 4.8%. If a slab needs it, a two-layer moisture barrier goes down before the basecoat.
Cracks get ground open and filled with Penntek Mender HD before any coating goes on. The flexible polyurea basecoat moves with the concrete, so the repair stays covered instead of reappearing as a line in the floor.
Want readings on your own slab? Book a free in-home quote or call 425-226-6085. Sheldon runs the installs and Nicole runs the consults, so the people who test your floor are the people who own the company.
Here's just a few of our previous projects.
