Davenport IA Epoxy Flooring has coated basement floors with epoxy for 20+ years in Davenport, IA, serving surrounding cities including Eldridge, Rock Island, Bettendorf, Moline and Milan. A basement floor is the hardest residential slab to coat well, because it sits below grade, often has a history with water and usually carries layers of old paint and patching. Getting it right starts with understanding that history before any product is chosen.
On every basement, the first visit is spent reading the slab for past water. We look at the floor drain and sump pit, check for white efflorescence, stains along the walls and rust around metal, and note every patch and crack. A moisture test is part of the scope before the price is final, and the result decides which primer goes down or whether a coating makes sense at all.
We will tell you plainly when a basement floor is not ready to coat. A coating does not stop seepage, it is not waterproofing and it is not radon mitigation. What it can do, on a dry enough slab, is turn a dusty, stained floor into a clean, bright surface that is easy to sweep and mop.
Reading a Basement Slab Before Coating
Signs of Past Water
Efflorescence, the white powder or crust that forms when water carries salts through concrete and evaporates, is the clearest sign. Tide lines on walls, peeling paint in patches, rusted shelving feet and a musty smell all point the same direction. None of these rule out a coating, but each one means we test more carefully.
We also ask what has happened in the house before. A basement that took water during a big storm or a sewer backup tells us something the slab alone may not.
Floor Drains, Sump Pits and Drain Tile
Most basements here have a floor drain, and many have a sump pit fed by perimeter drain tile. Those systems have to keep working after the floor is coated. We feather the coating into the drain body, keep the slab sloping toward it and leave sump lids and drain tile openings clear.
If the sump pump runs often or the drain has backed up, we recommend dealing with that first. Davenport offers a no-fault sewer backup reimbursement program for residents who have had a backup, and a backflow prevention device is worth asking a plumber about before a new floor goes in.
Moisture Testing Below Grade
We start with an ASTM D4263 plastic sheet test as a quick screen, then use ASTM F1869 calcium chloride kits or ASTM F2170 relative humidity probes when we need a number. Below-grade slabs often read higher than garage floors, especially on lots near creeks where the water table rises seasonally. The readings tell us whether a standard primer is enough or a moisture-mitigation primer is needed. We test on ground concrete when possible, because paint and sealers can hide the real readings.
Old Basement Floors and What Comes Off First
Paint, Patches and Tile Mastic
Basement floors in older homes often carry several coats of porch and floor paint, patches in different mixes and black mastic left from old tile. Davenport has many of these houses, with 69.7 percent of its housing built before 1980. Every one of those layers must be ground off, because a new coating bonds only as well as what it sits on.
We grind with dust captured at the machine and the stairway sealed off. Older black mastic can contain asbestos, so it is identified before anyone grinds it.
Cracks, Settled Areas and Old Coal Room Floors
Cracks are routed and filled, and low spots or settled sections are built up with patching or leveling material so the coating lays flat. Some older homes have rooms that were added or repoured over the years, with joints and level changes between them. We smooth those transitions so the finished floor reads as one surface.
If a crack is actively leaking water, we stop and talk about it. Sealing a wet crack under a coating moves the water rather than stopping it.
Historic Homes in Hamburg and McClellan Heights
Neighborhoods like the Hamburg Historic District and McClellan Heights include older housing with basements that have been patched, painted and repaired for generations. Those slabs can be thinner, softer or uneven, and some have no vapor retarder underneath. We go slower on them, test more and set expectations about how the finished floor will look.
Moisture, Water and What a Coating Cannot Do
Moisture-Mitigation Primers
When vapor readings run above what a standard epoxy tolerates, a moisture-mitigation primer is applied as its own layer before the body coat. These primers are made for high vapor emission and relative humidity readings. They are not designed for liquid water pushing up from below.
That distinction is why testing comes first. A primer can manage vapor; only drainage can manage water.
Hydrostatic Pressure and Flood Water
In 2019, basements in downtown Davenport took water from below as the high Mississippi pushed up through the storm sewers and the water table rose. That is hydrostatic pressure, and manufacturers state plainly that their coatings must not be used where it exists. A floor coating is never flood protection.
If a basement floods from below, the right sequence is drainage and dry-out first, then testing, then a decision about coating. We will not sell you a floor that the next high-water event will lift.
Not Radon Mitigation or Waterproofing
Covering a slab with epoxy can make it look sealed, but it does not reduce radon or stop water. Radon testing and mitigation in Iowa are done by professionals credentialed under Iowa Code chapter 136B. If a radon system is part of your plans, it should go in before the floor, and we coat around the pipe and seal points.
Choosing a Basement Floor System
Flake Floors for Laundry and Storage
Vinyl flake broadcast into an epoxy body coat gives a textured, speckled floor that hides dust and lint and feels less slick under bare feet. It works well for laundry areas, storage rooms and workshops. A clear topcoat seals the flake so the floor wipes clean.
Metallic and Solid Color for Finished Spaces
Metallic epoxy brings a marbled, decorative look to family rooms, bars and home theaters in finished basements. Solid colors with a satin topcoat suit home gyms and craft rooms. Both need a flat, well-prepared slab, since every low spot and patch shows through.
Low-Odor Options for Occupied Homes
Basement work happens under people who are still living in the house. We offer low-odor primers and topcoats as a comfort choice and plan ventilation for the cure. Water-based options are available where smell is a concern, with the trade-offs explained up front.
Our Step-by-Step Basement Floor Epoxy Process
Step 1: Water History, Testing and Proposal
We inspect drains, sump pits and signs of water, test moisture and map paint, patches and cracks. The proposal names the primer, coat count and finished thickness and lists the warranty exclusions for moisture and hydrostatic pressure.
Step 2: Grinding, Repairs and Primer
Old coatings and mastic are ground off with dust captured at the machine, cracks are filled and the slab is primed with the product the moisture readings call for. We check slab temperature and the dew point spread at the surface before the primer goes on, since basements often run cool and damp.
Step 3: Body Coat, Topcoat and Walk-Through
The body coat and any flake or metallic layer go down, followed by the topcoat. We walk the floor with you, confirm the drain and sump transitions, and leave care instructions.
- 20+ Years in Business
- Moisture Tested Before Pricing
- Free Written Estimates