A cracked 227 sq ft Seattle garage slab, mid-remodel and rated poor, became a warm Fieldstone flake office floor with Certified Penntek polyurea in March 2026.
A garage that becomes an office has to stop looking like a garage. This Seattle home was in the middle of a full remodel, and the old one-car garage was being turned into a workspace. New walls, new trim, a new door. Underneath it all sat a cracked, dusty slab with years of paint drips, patch marks and a long crack running the width of the room.
In March 2026 our crew finished the floor with a garage-to-office concrete coating in Seattle: 227 square feet of Certified Penntek polyurea in Fieldstone flake. Warm, earthy and finished enough to sit a desk on.
Remodels move in stages, so this floor got looked at more than once. At the free consultation in January 2026 the moisture meter read 3.2% in one spot and 4.4% in another. When we came back in early March, with the room half framed and full of tools, we tested again and saw readings of 5.7% and 4.4%. On install day the slab read 4.6%.
Why keep testing? Because a slab under construction changes. Doors are open, the heat is off, and wet weather finds its way in. Cascade tests every slab and reads more than one spot for that reason.
The concrete itself was in poor condition: cracks, rough patches, paint and drywall mud. That is normal for a remodel, and it is exactly what grinding and crack repair are for.
This was a true Seattle early-spring install. The slab was 39°F, the air 40°F and humidity 77%. The crew checks those numbers before the first coat goes down and logs every one of them for the Penntek warranty registration.
If you are wondering about winter timing in general, our post on coating concrete floors in the winter covers it.
Fieldstone Enviroflake is a warm blend of tan, brown and gray chips. In a garage it reads as clean. In an office it reads more like a natural stone floor, which is why it fit a remodel with stone and warm finishes elsewhere in the house. Against the fresh white walls it keeps the room bright without feeling cold.
It is also a practical pick for a workspace. Chair wheels, coffee drips and tracked-in grit from the yard blend into the 1/4 inch flake.
A finished room still sits on a garage slab. That slab can push moisture up, and it still moves with the seasons. Penntek polyurea forms a chemical bond with the concrete at over 1,300 PSI, and the basecoat is flexible, so it moves with the slab instead of cracking along with it. Watch the Penntek Stretch Test to see it bend.
The polyaspartic topcoat is non-porous, so spills wipe up. Every floor is backed by Penntek's limited lifetime warranty, registered at install. Penntek has dealers in 200 markets, which matters if you plan to stay in the house a long time.
Seattle has a lot of older homes with tight one-car garages that make more sense as offices, studios or guest rooms. Coating the slab is often simpler than building up a wood subfloor, and it keeps the ceiling height you already have.
See our concrete floor coatings in Seattle page for more. For a very different Seattle job, look at a Seattle homeowner who chose lifetime protection over a quick fix.
Yes. We grind, repair and coat the existing slab, and it becomes the finished floor. It works best scheduled after drywall and paint, before baseboards and furniture.
Usually not. This floor went down on a 39°F slab in March. We measure slab and air temperature, humidity and moisture on install day and plan around them.
Readings change, especially during a remodel when doors stay open and the heat is off. Testing at the consult and again on install day tells us whether a moisture barrier is needed before the basecoat goes down.
Planning a garage conversion or remodel? Book a free in-home quote or call 425-226-6085. Nicole will set up a time that works with your builder's schedule.
Here's just a few of our previous projects.
