Hillsboro Basement Epoxy Floors on the Valley Floor

You do not dig a basement into the Tualatin Valley floor unless you enjoy pumping water. The 1990s to 2010s subdivisions around Tanasbourne, AmberGlen, and Jackson School were built on slab or crawlspace, and the Orenco Station townhomes are all on grade. So the basement question in Hillsboro is really a question about ground-floor slab rooms.

That covers a lot of ground. The downstairs flex room in an Orenco townhome. A garage bay turned into a home office for somebody who works at the Intel campus. An older house near Downtown Hillsboro with a converted garage and 1960s concrete. Every one of those sits on the same valley clay, and every one gets tested before we coat it.

Clay That Holds Water Under the Slab

The clay under Hillsboro holds water through the winter, and the valley stays foggy and damp from November into spring. Vapor comes up through any slab touching that ground. Our first step is reading it, either with a taped calcium chloride dome or a probe set into a drilled hole. A high number means a primer designed to hold back moisture goes down before anything else.

Over that primer we roll a 100% solids epoxy, broadcast flake to full coverage, and seal with polyaspartic. The system builds to 30 to 40 mils and is warrantied for 15 years. In a townhome ground floor with no windows, the biggest benefit people notice is that the dusty concrete smell is gone.

Our Basement Epoxy Floors System

Materials: Moisture-mitigating primer, 100% solids epoxy, flake broadcast, polyaspartic topcoat
Thickness: 30-40 mils
Install time: 2-3 days
Walk on it: 1-2 days after
Heavy furniture: about a week after
Warranty: 15 years

Moisture tolerant. Mold resistant. Easy to clean.

Tight Townhomes, Long Drive, Batched Jobs

Orenco townhome garages and flex rooms are small and every inch counts. We coat to the wall and up the bottom of a step so nothing is left bare. Older downtown slabs often have paint and patches that have to be ground off. Around Jackson Bottom Wetlands the ground water is close to the surface, so expect a higher reading there. Hillsboro is about 50 minutes from us, across Portland on Highway 26, so we group jobs on the west side into the same week to keep the schedule tight.

Hillsboro Neighborhoods We Cover

Orenco Station, Tanasbourne, AmberGlen, Jackson School, Downtown Hillsboro, Reedville

Hillsboro Pricing

An Orenco flex room is often 200 to 300 square feet, which is $1,000 to $3,000 at our $5 to $10 rate. A converted garage in Tanasbourne, about 400 square feet, runs $2,000 to $4,000. Most Hillsboro slabs read high enough to need the primer, so plan for the middle of the range or above.

Frequently Asked Questions

Why do so few Hillsboro homes have basements?

Clay soil and a high water table on the valley floor. Builders put homes on slab or crawlspace to stay out of the wet ground. The slab rooms that exist still get the moisture, which is why we test every one.

Can you coat the ground-floor flex room in an Orenco townhome?

Yes, if it is concrete under the carpet or plank. We pull the old flooring if you want, grind, test, and coat. Even a small Orenco flex room takes about two days of our time, then a day or two before you walk on it and about a week before furniture goes back.

Does the long drive from Vancouver cost extra?

We do not add a travel line. We schedule Hillsboro work alongside other west-side jobs so the 50 minute drive is spread across the week. It can mean a slightly longer wait for a start date.

Our converted garage near downtown has old paint and patches. Is that a problem?

Only for the prep. The paint gets ground off completely and the patches are checked for soundness. Loose ones get cut out and refilled. Then we test and coat as normal.

Is the floor okay for a home office with a rolling chair?

Yes. The polyaspartic topcoat handles chair casters better than most floors. If you want to keep it looking new for longer, use soft urethane casters or a chair mat. Tanasbourne offices take the most traffic.

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