Crazing and moisture readings up to 6.9% at consult. This Duvall garage was retested, then coated in Ash flake Penntek polyurea in December 2025.
December in Duvall is wet, dark and cold, and a garage slab feels all of it. This Duvall homeowner had a two-car garage with a surface covered in fine spiderweb cracks, dark damp-looking patches near the walls and stains from years of parking. They wanted a light, clean floor before the new year.
In December 2025 Cascade put down a garage floor coating in Duvall with Certified Penntek polyurea in Ash flake, coating the low concrete stem walls along with the floor. What made this one interesting was the testing that came first.
At the free consultation in early December 2025, the moisture meter read 5.1% in one spot and 6.9% in another, near a darker patch of concrete. The surface also had crazing, the fine web of shallow cracks that forms when the top of a slab shrinks as it cures.
Ten days later the crew came back and tested again in three places: 5.0%, 5.4% and 5.8%, including a reading right at the edge by the garage door. Cascade tests every slab, and readings like these are exactly why. Concrete moisture moves around with weather and season, and the install plan has to match what the slab is actually doing. When a slab needs it, a two-layer moisture barrier system goes down before the basecoat.
The install happened in one day, the week before Christmas 2025:
The control joints stay as clean lines, and the floor drains and round access covers were kept clear.
Ash Enviroflake is a pale grey blend with white and darker grey chips. In a garage with warm overhead lights and cream walls, it reflects a lot of light back up, which makes the space feel bigger on a grey afternoon. Carrying the flake up the stem walls gives the room a finished edge and keeps the bottom of the walls easy to wipe down.
Plenty of people search for an epoxy garage floor. What Cascade installs is Certified Penntek polyurea, and the difference shows up a few winters in. Typical epoxy is rigid and often starts to have problems in years 3–5. A slab with crazing and seasonal moisture keeps moving, and the Penntek basecoat is flexible enough to move with it. The Penntek Stretch Test shows that flex.
The bond is chemical, over 1,300 PSI. Before the coating comes up, the concrete will come up. Penntek floors are built for up to 5x the lifespan of typical epoxy, and every job carries a limited lifetime warranty backed by Penntek. Our demo page has more test videos.
Duvall sits on the Snoqualmie River, and the valley floor holds water through the wet months. Garage slabs here often read higher on moisture than slabs up on drier ground, so testing isn't optional. Our guide on how long garage floor coatings last in the Pacific Northwest explains what matters most.
See more of our garage floor coatings in Duvall, or compare this light floor with a Duvall garage we coated in Nightfall.
That's usually crazing, shallow surface cracks that form as the top of the slab shrinks during curing. They're mostly cosmetic. Diamond grinding opens up the surface and the coating covers them completely.
Concrete moisture changes with rain, temperature and season. Testing at the consultation and again before install shows the trend, not just one snapshot. That decides whether a moisture barrier is needed.
Yes. The crew grinds and coats the low concrete walls along the floor in the same flake. It gives the garage a finished look and protects the base of the walls from water and dirt.
Curious what your own slab reads? Book a free in-home quote or call 425-226-6085. Nicole and Sheldon run Cascade themselves, and the moisture test is part of every visit.
Here's just a few of our previous projects.
