A cracked, stained Seattle garage with a water heater and furnace in the corner, coated in 1/8 inch Rhino Grey flake with Certified Penntek polyurea.
Most Seattle garages built a few decades ago share a look. Exposed studs, a water heater and furnace in the corner, shelves along the wall, and a grey slab with a crack wandering across it. This one was also packed wall to wall with bins, boxes and bikes when we first saw it in March 2025.
The homeowner wanted a clean, bright floor that would make the space feel like part of the house. In April 2025 Cascade installed a garage floor coating in Seattle with Certified Penntek polyurea and a fine 1/8 inch Rhino Grey flake, a tight blend that reads almost like a solid color from a few feet away.
At the free in-home consultation we tested the concrete before talking about colors. The moisture meter read 3.7% in one spot and 4.2% in another. A scratch test checked how hard the surface was, which tells the crew how to set up the grinder.
The rest was visible to anyone. A long crack ran from the garage door into the slab, and a second line crossed the middle of the floor. There were rust marks, old spills and a dark stain near the furnace. Along the back wall, a strip of rough concrete met the wood framing.
Once the garage was cleared, the floor went in during a single day:
Blue tape kept the coating clean around the water heater stand and the furnace base, so the floor runs right up to the equipment.
A lot of flake floors use a 1/4 inch chip. A 1/8 inch flake is smaller and denser, so the floor looks smoother and more uniform. Rhino Grey works with white walls and natural wood without fighting either one. It still hides dust and tire marks better than a true solid color would.
Rhino Grey isn't on our color pages, so ask about it at your quote. You can see the current lineup on our styles and colors page, and our post on choosing a color and finish walks through how flake size changes the look.
A lot of people search for an epoxy garage floor. What we install is Certified Penntek polyurea, and it behaves differently in a few ways that matter in a garage like this one.
The Penntek Hammer Test shows what happens when you hit a coated slab with a hammer. The floor carries a limited lifetime warranty backed by Penntek, registered on every job.
Seattle has a lot of garages like this one: older slabs, a mechanical room tucked into the corner, and months of rain tracked in on tires. Moisture is the part people can't see, which is why we meter every slab. Our post on moisture in concrete and garage coatings explains what we look for and when a moisture barrier comes into play.
For more about our work in the city, see our Seattle garage floor coating page, browse other garage floor projects, or look at a cracked patio and walkway we coated in the same part of Seattle.
A 1/4 inch flake gives a classic speckled look and hides the most. A 1/8 inch flake looks finer and closer to a solid color. Both get the same basecoat and topcoat, so the choice is about looks, not strength.
Yes. The crew grinds and coats around equipment bases and tapes off the units themselves. The floor ends up continuous from wall to wall with clean edges at each appliance.
Yes, and that is part of the install. Cracks are ground out and filled with Penntek Mender crack repair before the basecoat goes down, so they disappear under the flake.
Ready to clear out your own garage and start over? Book a free in-home quote or call 425-226-6085. Nicole and Sheldon own Cascade, and you'll deal with them directly.
Here's just a few of our previous projects.
