A new Shoreline home's garage went from drywall mud and boxes to a Slate Stone flake polyurea floor in one day in March 2026, after four moisture readings.
New concrete is the easiest concrete to protect and the easiest to ruin. This garage belongs to a brand-new home in Shoreline, finished in early 2026. When we first saw it, the slab was still covered in drywall mud, paint drips, boot prints and a pile of moving boxes. The house was ready. The garage floor was not.
The goal was to get a real finish down before daily life started: a long, narrow garage with a water heater, a steel bollard and a door into the house. In March 2026 our crew installed a garage floor coating in Shoreline with Certified Penntek polyurea in Slate Stone flake, in a single day.
New does not mean dry. Fresh concrete can hold a lot of water, and new garages often get closed up before the slab has had a chance to give it up. So at the free consultation on March 11 we took four moisture readings across the floor: 5.0%, 5.2%, 5.4% and 5.6%. We test every slab before quoting, new or old.
The surface itself was sound, with crisp control joints and no settling cracks. The issue was everything sitting on top of it. Drywall compound, paint and construction grime all have to come off, or a coating has nothing clean to bond to.
Eight days after the consult, the crew sealed off the garage door opening with plastic and got to work.
The coated stem walls give the floor a clean edge against the white drywall, which matters in a garage this narrow, where the walls are close to everything.
Slate Stone Evolution is a grey blend with charcoal, white and soft blue-grey chips. With white walls and a dark garage door frame it looks finished and modern, but not cold. The mixed chips hide the dust and tire grit that a new garage starts collecting from day one.
Plenty of new homes get a quick floor paint or no finish at all. Bare concrete stains with the first oil drip, and painted floors often lift under hot tires within a year or two. A brand-new slab is the best chance to get it right once.
Certified Penntek polyurea bonds chemically with the concrete, with over 1,300 PSI bond strength. The basecoat stays flexible as the new slab cures and settles over the next few years, so it moves with the concrete instead of cracking. And the polyaspartic topcoat is non-porous and resists hot tire pickup. You can watch the Penntek Hammer Test to see what the system takes.
The limited lifetime warranty is backed by Penntek, not just the installer, and it is registered on every job. That matters when you plan to live in a house for decades. Our post on what a Certified Penntek Dealer is explains why the manufacturer backing counts.
Shoreline sits between Seattle and Edmonds along Puget Sound. Marine air keeps things damp much of the year, so garages here need floors that shrug off water, salt and grit carried in on tires.
See our page on garage floor coatings in Shoreline, or look at another Shoreline garage that mixed Silver Creek and Slate Stone. More homes are in our project portfolio.
We go by moisture readings, not just the calendar. We test the slab at the consult, and if it reads in range we can coat it. If not, we wait or use a two-layer moisture barrier.
Not once it is ground off. Diamond grinding removes construction residue and opens the concrete so the polyurea can bond chemically. Coating over it without grinding is what causes early peeling.
It is easier, since the floor is empty. Lived-in garages work too. The crew works around wall storage and appliances like the water heater here.
Building or just moved in? Book a free in-home quote or call 425-226-6085. Sheldon's crew will test your slab and give you a straight answer.
Here's just a few of our previous projects.
