Basement Floor Epoxy in Bismarck, ND

Basement floor epoxy turns a bare, dusty slab into a floor you can wipe clean, and it is a common project in Bismarck homes with unfinished lower levels. The biggest factor in whether it lasts is moisture. A basement slab sits against the ground, and in summer it can be cooler than the air around it. Wikipedia lists Bismarck's annual average relative humidity at 66.4% and describes its summers as warm and humid. The EPA notes that condensation forms where warm, humid air meets a cold surface, and recommends keeping indoor humidity below 60%.

Testing before we recommend anything

Moisture coming up through the slab is the most common reason basement coatings blister or peel. Before we quote a basement, we test the slab and look for efflorescence (white mineral crust), dark damp spots, and signs of past water. If moisture is moderate, we use a moisture-tolerant primer. Bob Vila's coating guide puts a moisture barrier at about $1 per square foot extra. If water is actively getting in, we tell you to fix the source first.

Radon comes first

The North Dakota Department of Environmental Quality reported in January 2026 that 63% of homes in the state have radon above the EPA action level of 4 pCi/L. A coating seals the floor surface, but it is not a radon mitigation system and does not replace one. We recommend testing for radon before finishing a basement, and if you need a mitigation system, having it installed before the floor is coated so the suction point and any sealed cracks are planned for.

Picking a basement finish

• Solid color epoxy: a clean, bright floor for laundry rooms and storage areas.
• Partial flake: a little pattern and texture without the busy look of a full broadcast.
• Metallic epoxy: a marbled, poured finish for rec rooms, bars and theater spaces.
• Clear sealer over ground concrete: a lower-cost option for utility spaces.

Older and newer basements

Bismarck homes built in the 1970s and earlier often have basement slabs with old paint, glue from removed carpet or tile, and patched cracks. Those coverings have to be ground off. Newer homes usually have smoother slabs but can still have shrinkage cracks and sealers from the builder. Either way, we grind the slab so the coating bonds to the concrete.

Living with a coated basement

A coated basement floor is easy to sweep, mop and wipe up. It also helps brighten a dark space, since a light color reflects more light. Area rugs work well on top. Run a dehumidifier in summer if your basement tends to feel damp, both for the floor and for the rest of the space.

Sump pits, drains and utility areas

Many basements have a floor drain, a sump pit, a water heater and a furnace sitting on the slab. We coat around fixed equipment and keep drains open and pitched so water still reaches them. Around the sump pit we finish the coating at the rim so the lid still sits flat. If you plan to move or replace a water heater or furnace soon, doing that before the coating saves a patch later.