Basement Floor Epoxy in Missoula, MT

Basement floor epoxy turns a dusty gray slab into a bright, washable floor for a rec room, home gym, laundry area, workshop or storage. It is also the coating job most likely to go wrong when it is rushed. A basement slab sits right on the ground, and water vapor moving up through it is the most common reason basement coatings blister and let go. So every basement job we take starts with the concrete, not the color chart.

Older homes and their lower levels

Missoula's housing runs from early 1900s homes near downtown and the university to subdivisions built in the last few years. American Community Survey figures for 2019 to 2023, summarized by Point2Homes, show about 13 percent of the city's homes were built in 1939 or earlier and another 21 percent between 1940 and 1969. Lower levels in houses that age can have thin or patched slabs, old floor paint, tile adhesive, and no vapor barrier under the concrete. Newer homes usually have better slabs, but a new basement can still release moisture as the concrete keeps drying.

How we check for moisture

We look for the signs first: white mineral deposits on the floor or walls, dark damp patches, paint bubbling or peeling, and a musty smell. Then we test. A simple first test is taping plastic sheeting to the slab and checking under it for condensation. More precise tests measure how much vapor is moving through. If there is moderate moisture, we use a moisture-tolerant primer under the system. If water is actually coming in at a crack, the floor-wall joint or a window well, that gets fixed before any coating, and we tell you so.

Radon comes first

Montana's DEQ told KMPT in 2014 that the average radon level in Missoula was about 7 pCi/L and that about 53 percent of tests in Missoula County read above the EPA action level of 4 pCi/L. In 2025, Missoula County said local radon levels run up to five times the national average. The DEQ's radon program recommends testing the lowest lived-in level of a home. A floor coating is not a radon barrier and is not a mitigation system. If you are finishing a basement, test first, mitigate if needed, and then coat the floor. If a mitigation pipe and suction pit are already in place, we coat around them and keep them sealed.

Picking a finish for the space

• Solid color with a light flake: bright and easy to clean, a good fit for laundry rooms and storage.
• Full flake: hides wear and adds texture, good for gyms and kid spaces.
• Metallic epoxy: a poured, swirled finish for a bar, media room or finished living space.
• Clear sealer over ground concrete: a lighter-duty option where you mainly want dust control.

Drains, sumps and floor-wall joints

Floor drains and sump pits have to stay open and working, so we coat up to them and leave them clear. We fill cracks and seal the joint between floor and wall where it is open, and we can carry a cove up the base of the wall on request. We do not coat over active leaks.

Keeping humidity in check

Even a well-bonded basement floor does better when the air is managed. In summer, warm air meeting a cool slab can condense on the surface. A dehumidifier during humid stretches, good airflow, and fast cleanup of laundry or water heater leaks all help a coated basement floor last.