An Issaquah garage tested at 4.1% to 5.0% moisture got crack repair, a coated cove base and a Domino flake Penntek polyurea floor in fall 2026.
Three moisture readings, three different numbers. When we tested this Issaquah garage slab the meter read 5.0% in one spot, 4.1% in another and 4.2% in a third. That spread is a good reminder of why we never test a garage in just one place. The slab also had a long crack across the main bay and the stains and wear of a garage that gets used every day.
In fall 2026 our crew installed a garage floor coating in Issaquah with Certified Penntek polyurea in Domino flake, with a coated cove base along the walls. The result is a crisp black, white and grey floor that looks sharp against white drywall.
We met the homeowner for a free consultation in mid-September 2026. The scratch test checked hardness. The moisture meter went to several spots, including near the garage door and along the edges where concrete tends to hold water longer.
Moisture is the quiet reason many garage coatings fail around here. Water vapor moving up through the slab pushes against whatever is on top. A coating that only sits on the surface will eventually blister or lift. That is why we test every slab and add a two-layer moisture barrier system when a slab needs it.
Prep started at the end of September and the floor was finished on October 1. The steps:
The cove keeps water and grit from collecting in the corner, which is where bare garages always look dirtiest.
Domino Evolution is a high-contrast mix of black, white and grey chips. In this garage, with white walls, overhead storage racks and a white garage door, it gives the room some definition. From the driveway it reads as a clean speckled grey. Up close the contrast shows.
A busy pattern is also forgiving. Wet tire tracks, needles and road grit off the car blend in until you get around to sweeping.
People search for an epoxy garage floor. What we install is Certified Penntek polyurea. The basecoat uses a silane adhesion promoter to form a chemical bond with the concrete at over 1,300 PSI. Before the coating comes up, the concrete will come up. It is also flexible, so it moves with the slab as temperatures swing instead of cracking.
Read more about moisture in our post will moisture in my concrete ruin my garage floor coating. To see the bond tested, watch the Penntek Hammer Test.
Issaquah gets a lot of rain, and many homes sit on wooded or hillside lots where the ground stays wet. Slabs pick up that moisture from below. Testing first is the only way to know what a floor needs. It is also why we do every consultation in person.
See more on our Issaquah epoxy garage floor alternative page, or look at a long, narrow Issaquah garage we coated in Mount Everest.
Concrete rarely dries evenly. Edges, low spots and areas near the door often read higher than the middle. Testing several spots shows us the real range so we can plan the right system.
We add a two-layer moisture barrier system under the basecoat when a slab needs it. We decide that at the consultation, based on the readings.
Yes. Cracks are ground open and filled with Penntek Mender before the basecoat. The flexible polyurea then bridges the repair.
Curious what your slab reads? Book a free in-home quote or call 425-226-6085 and we'll test it.
Here's just a few of our previous projects.
