Grinding this Kirkland two-car garage revealed cracks across the whole slab. Every one was repaired before a Smoke flake polyurea floor went down.
From the doorway, this Kirkland garage looked fine. Two bays, a center post, a wall of light wood cabinets, and a full shoe rack by the house door. Once everything was cleared out and the floor was ground, the real picture showed up: a web of cracks running across almost the entire slab, branching in every direction.
At the end of June 2025 our crew repaired every one of those cracks and installed a garage floor coating in Kirkland with Certified Penntek polyurea in Smoke flake. You'd never guess what's under it now.
The free consultation was in early May 2025. Moisture read 2.1% and 2.0%. The concrete was dusty and stained, with oil marks near the door and a few visible cracks.
Grinding opens up the surface, and that is when hairline cracks show their full length. Here they spread across both bays in a pattern that looked a bit like a road map. Cracks like these are common in older slabs that have settled and moved for decades. They are also the reason so many rigid coatings fail, because the coating cracks right along the old lines.
The finished floor was photographed the next morning with the cabinets and shoe rack back in place.
Smoke Evolution is a mix of black, charcoal, grey and white chips. It is one of the best blends for hiding what a garage collects: tire dust, dried drips, the odd leaf. Next to the pale wood cabinets and white walls, it gives the room some contrast without going dark.
Busy flake also helps on a slab like this one. Even if you knew exactly where every crack was, you wouldn't be able to find it under the pattern.
Here's the problem with typical epoxy on a cracked slab. Epoxy is rigid. When the concrete shifts with temperature or settles a little more, the coating has nowhere to go. It cracks along the old line, and moisture starts working under the edges. Those problems usually show up in years 3–5.
The Penntek basecoat is flexible. It moves with the slab instead of fighting it, and it bonds to the concrete at over 1,300 PSI. The Penntek Stretch Test shows how much the basecoat can give before it lets go. That flexibility is a big part of why Penntek floors are built for 30–40 years. Our post on how long a Penntek floor lasts goes into more detail.
Plenty of Kirkland homes have garages that have been through decades of wet winters and freeze-thaw. Settling cracks are normal. They're not a reason to skip a coating, as long as they get repaired right before anything goes on top.
Learn more about our Kirkland garage floor coating work, or compare this floor with a Kirkland garage we finished in Tidal Wave. You can also read what other homeowners say on our reviews page.
Yes, in most cases. Each crack is opened, filled with Penntek Mender crack repair and ground flush before the basecoat goes down. Structural problems like big heaves or sunken sections are a different story, and we'll tell you at the consult.
Dirt, sealer and wear hide fine cracks. Grinding removes the top layer of the concrete, and that exposes the full length of every crack. The crew repairs whatever the grind reveals.
The flexible polyurea basecoat moves with the slab, so small movement doesn't split the coating the way it can with rigid epoxy. The floor carries a limited lifetime warranty backed by Penntek.
Worried about the cracks in your own garage? Book a free in-home quote or call 425-226-6085. We'll look at the slab, test it, and tell you plainly what it needs.
Here's just a few of our previous projects.
