Resinous flooring moved from chemical plants into schools, hospitals, retail and data centers as its chemistry, installation methods and standards matured.
For architects, engineers and facility owners, resinous flooring is now a realistic option in building types where it was rare a generation ago, and that wider choice raises the stakes of matching the system to the space. This article covers how the category grew, what changed along the way and what that history means for writing a specification today.
Resinous floors are liquid-applied systems that cure on the slab into a hard, monolithic surface. The main chemistries are epoxy, polyurethane, urethane cement and polyaspartic, and a single system often combines more than one.
They range from thin coatings to troweled mortars, and they can include broadcast quartz, flake or aggregate for texture and color. The common thread is a continuous surface bonded to prepared concrete, without the grout lines of tile.
Epoxy resins were developed in the 1940s, and early interest focused on coatings that could resist caustic and chemical exposure. Industrial owners adopted them on concrete floors where acids, oils and wash-down quickly damaged bare concrete and conventional paint.
Polyurethane chemistry developed over the same period. Urethane cement, which combines polyurethane resin with cement and aggregate, dates to the late 1960s and was first aimed at chemical plants, where thermal shock and aggressive cleaning were the problems to solve.
Those early floors were selected to survive the exposure. Appearance was a secondary concern, and the work was done by a small group of specialty contractors serving heavy industry.
Formulators moved toward 100 percent solids and low-VOC products, lower-odor materials and resins with better color stability. Low-odor products made it practical to work near occupied areas, which matters in schools and hospitals.
Faster-curing chemistries such as polyaspartics, along with fast-cure epoxies and accelerated urethane cements, shortened the time a floor is out of service. That change opened resinous floors to owners who cannot close a space for long.
Function-specific systems extended the range further:
Colored quartz, decorative flake and metallic finishes turned a protective floor into a design element. Architects gained color, pattern and texture choices for spaces that also need a durable, cleanable surface.
That shift moved resinous flooring onto finish schedules alongside tile, terrazzo and resilient flooring. Selection is now often a design decision as well as a performance decision.
Surface preparation and testing became standardized. The concrete surface profile guideline (ICRI 310.2R) gave the industry a common reference from CSP 1 to CSP 10, and the concrete surface preparation standard (SSPC-SP 13/NACE No. 6) addressed how concrete is prepared.
The in-situ relative humidity test (ASTM F2170), first issued in 2002, gave a repeatable slab moisture method alongside the older calcium chloride test (ASTM F1869). Those documents made it possible to write enforceable specifications instead of relying on installer judgment alone.
Resinous floors now appear across a wide range of building types:
Wider use brought a wider range of installers and products. That helps availability, but it also means a resinous floor in a school corridor may be specified, bid and installed by people who have done few of them.
Points worth carrying into any resinous floor specification include:
A resinous floor in a new market is held to the same physics as one in a chemical plant. The difference is that the owner may not have flooring experience on staff, so the specification has to carry more of the load.
Tnemec Company's flooring products reflect that broader market:
Resinous flooring grew from a product chosen to survive chemical plants into a mainstream option for many building types. In our experience, most problems in newer markets come from gaps in the specification rather than from the chemistry, so the specification should match the system to the real exposure and require the testing and installer qualifications that made the category reliable.
A floor chosen for a school or hospital deserves the same rigor as one chosen for a chemical plant.
We are happy to help. Contact a High Performance Coating Consultant in your region to review your project conditions and specification.