Epoxy Flooring: Types, System Build-Ups, Thickness and Where Each Works

Epoxy flooring is a two-component resin floor system, a liquid epoxy resin cured with an amine hardener on prepared concrete or screed, built from a 0.3 mm roller coat up to a 3 to 4 mm broadcast floor. Both ends of that range are data-sheet builds: the 0.3 mm (11.8 mil) roller coat of Sikafloor-264 N and the 3 to 4 mm (0.12 to 0.16 in) broadcast system of Sikafloor-264 N Thixo. Which build belongs on which floor depends on traffic, wash-down, heat and the moisture left in the slab.

In the EU an epoxy floor is declared as synthetic resin screed material under EN 13813:2002 (code SR), and CE marking starts at bond class B1,5, impact class IR4 and wear class AR1 or RWA10. In the UK the same product is called a resin floor and graded in the eight FeRFA Types behind BS 8204-6:2008+A1:2010, while the US relies on test methods such as ASTM D7234-22 and D4060-25 instead of a product standard. Epoxy floors are one class within the wider family of construction chemicals.

This page follows a specification: chemistry, uses, performance, standards, build-up selection, application by temperature, inspection, safety, dated prices, alternatives and sourcing.

Standards, codes and regulations are checked against their issuing bodies, product values against the named data sheet and prices against the dated source named in the sentence; see our methodology and fact-checking.

The summary table below lists the attributes a specifier checks first on any epoxy floor.

What Is Epoxy Flooring?#

An epoxy floor is a seamless, cross-linked thermoset layer bonded to concrete, and the same chemistry covers clear seal coats, pigmented coatings, self-leveling toppings and quartz-filled mortars. What separates one epoxy floor from another is the build: thickness, filler content and the number of layers.

Six product forms reach the market: two-component liquids, two-component liquids with filler or aggregate, three-component packs of resin, hardener and aggregate, 100 % solids liquids, water-based two-component grades and three-component epoxy-cement. Polyurethane, polyaspartic, PU-cement and MMA binders share the substrate rules of epoxy, and all five chemistries are compared under resin and industrial floor coatings.

Resin, hardener and filler: the parts of an epoxy floor system#

An epoxy floor system has four parts: the resin component, the hardener component, fillers or aggregate, and in epoxy-cement grades a cement-filled third component. The binder of most Part A components is liquid epoxy resin, the bisphenol A-epichlorohydrin reaction product with a number average molecular weight of at most 700 (CAS 25068-38-6, EC 500-033-5); bisphenol A diglycidyl ether (BADGE, CAS 1675-54-3, EC 216-823-5) carries its own harmonised entry. The four parts are listed below.

• Part A resin: liquid bisphenol A and/or F diglycidyl ether resin thinned with reactive diluents; grades and chemistry of epoxy resins and hardeners are covered on the materials page.
• Part B hardener: an amine curing agent, with hazards read on its own SDS.
• Fillers and aggregate: sand mixed into self-leveling and mortar layers, or quartz broadcast for build and texture.
• Epoxy-cement (EpoCem type): resin, hardener and a cement-based component in one three-component mortar.

Regional names: resin floor, epoxy screed and resinous flooring#

Epoxy floors carry five regional names that describe the same chemistry, not a class. The table below maps each name to its region and meaning.

How Does an Epoxy Floor Cure and Bond to Concrete?#

Amine hydrogen atoms in the hardener open the epoxide rings of the resin and link the chains into a hard thermoset, a reaction that runs faster when warm and slower when cold. The Euclid Chemical CP-29 epoxy guide puts the effect in numbers: a rise of 10 to 11 °C (18 to 20 °F) halves pot life and cure time, and an equal drop doubles them. Pot life in that guide is the time a mixed epoxy needs to double in viscosity. The bond forms when the liquid resin wets the open texture of prepared concrete and hardens inside it, so laitance, dust and surface moisture come off before the first coat.

Cold, humid air turns the same chemistry against the floor. Amines react with carbon dioxide and moisture at the surface to form a carbamate film, and Dinnissen (TRB, 2005) separates two effects: blushing, when moisture condenses on the coating during cure, and blooming, when amine exudes to the surface. Either residue weakens the bond of the next coat. Hardener chemistry changes the risk: the Evonik epoxy curing agents guide describes cycloaliphatic amines as resistant to blush and water spotting, and phenalkamines are described as non-blushing curing agents.

Where Is Epoxy Flooring Used?#

Epoxy flooring is used on interior concrete and polymer-modified screeds that carry foot, wheel or forklift traffic, spills and wash-down, from warehouses and workshops to plant rooms and garages. The base is concrete of at least strength class RC30 (BS 8500-2) or a polymer-modified screed; the FeRFA guide excludes unmodified sand-cement screeds and anhydrite screeds as bases.

The five use groups below each lead to the page that covers the problem or system in full.

• Parking decks and ramps, covered under parking structure traffic coatings.
• Cracked slabs, treated before coating under concrete floor and slab crack repair.
• Residential and commercial garages, which use the thinner FeRFA Type 2 to 4 builds compared under garage floor coatings.
• Process areas with acids and solvents, where novolac epoxy forms chemical-resistant linings.
• Electronics areas, where epoxy with conductive fillers over a conductive primer and grounding tape forms ESD and conductive floor coatings.

Which Properties Define an Epoxy Floor's Performance?#

Six properties describe an epoxy floor: compressive and flexural strength, bond to the substrate, hardness, abrasion loss and the temperature it tolerates under load. Each property is reported with its test method, and EU and US data sheets use different methods for the same property, so a 58 N/mm² result to EN 13892-2:2002 and an 86 MPa result to ASTM C579 are not a ranking. The table below lists product values from three data sheets with the test method as printed.

Product values, not class requirements: each row belongs to the named product and its printed test method.

Standard requirement or product value: reading epoxy floor data#

A standard requirement applies to every product of a class, while a data-sheet value describes what one product reached in one test. The pull-off level that FeRFA guidance, the basis of BS 8204-6, accepts as satisfactory is above 1.5 N/mm² (218 psi) tested to BS EN 13892-8:2002, and that figure is guidance, not an EN 13813 requirement. The adhesion rows in the table above report failure in the concrete, so they describe the substrate as much as the coating. EN 13813:2002 treats bond as a declared class from B0,2 to B2,0, chosen by the maker and printed on the declaration of performance. Strength results from ASTM C579-23 and EN 13892-2:2002 use different specimens and are never compared number for number; C579-23 itself splits into Method A for aggregate below 1.6 mm, Method B for 1.6 to 10 mm and Method C above 10 mm.

Heat, UV and chemical limits of epoxy floors#

Epoxy floors carry a heat limit declared per product, and the Sikafloor-264 N data sheet warns that mechanical or chemical strain at up to +60 °C (140 °F) may damage the floor and notes discoloration in direct sunlight. Aromatic epoxy yellows under UV, so sunlit areas take an aliphatic topcoat. The FeRFA guide accepts steam cleaning only on heavily filled Type 8 floors of at least 9 mm (0.35 in). Chemical duty is read from the maker's resistance chart; the Sherwin-Williams flooring chemical resistance guide rates OK for exposure of up to 72 hours before cleaning, SD for daily splash or spillage and NR for not recommended. Acids and solvents beyond those ratings call for novolac epoxy, specified as chemical-resistant linings.

Which Standards and Types Apply to Epoxy Flooring, in the EU, UK and US?#

In the EU an epoxy floor is CE marked as EN 13813:2002 synthetic resin (SR) screed material, the UK adds BS 8204-6 and the FeRFA Types, and the US uses test methods only. Regulation (EU) 2024/3110 applies from 2026-01-08, and standards cited under Regulation (EU) 305/2011 stay valid until a product family moves under a 2024/3110 implementing act, so CE marking to EN 13813:2002 continues. The table below sets the documents of the three regions side by side.

EN 13813 SR designation and the CE threshold#

An SR screed material declares three properties: bond strength (B), wear resistance (AR or RWA) and impact resistance (IR). Bond classes run B0,2, B0,5, B1,0, B1,5 and B2,0, and the BCA wear classes run from AR6, a wear depth of 600 µm (23.6 mil), down to AR0,5 at 50 µm (2.0 mil). Table ZA.1.5 of EN 13813:2002 sets the threshold for CE marking of SR material: wear of at most RWA10 or AR1, bond of at least B1,5 and impact of at least IR4. A designation prints the binder code and the classes in sequence, for example "EN 13813 SR-B2,0-AR1-IR4", with comma decimals as printed in the standard. The classes are read from the declaration of performance, never inferred from a data-sheet strength.

FeRFA Types 1 to 8 as epoxy build-ups#

FeRFA sorts resin floors into eight types, from a Type 1 seal of at most 150 µm (5.9 mil) to a Type 8 heavy-duty floor over 6 mm (0.24 in). The type names thickness and duty, not chemistry, so the same epoxy resin appears in several bands, with duty running from light (LD) through medium (MD) and heavy (HD) to very heavy (VHD). The table below maps each type to its epoxy build.

US practice: test methods instead of a product standard#

No US standard classifies resin floor products, so US specifications cite test methods and the maker's data. Four ASTM methods carry most epoxy floor data: D7234-22 for pull-off strength of coatings on concrete with portable testers, D4060-25 for Taber abrasion, E1356-25 for the glass transition temperature by differential scanning calorimetry (ISO 11357-2 is the equivalent) and C579-23 for compressive strength of resin mortars and surfacings. ASTM D4541 covers pull-off on metal substrates, so a coating on concrete belongs to D7234. Test setups and failure modes are compared under pull-off adhesion testing.

How do you check an SR claim on a declaration of performance?#

Four checks confirm an SR claim on a declaration of performance, listed below in reading order.

1. Confirm that the declaration cites EN 13813:2002 and the code SR, issued under the EU Construction Products Regulation.
2. Compare the declared classes with Table ZA.1.5: wear at most RWA10 or AR1, bond at least B1,5, impact at least IR4.
3. Read the AVCP system printed on the declaration; the Sikafloor-2350 ESD declaration (DoP 2022-05-20) states SR, Bfl, ≤ AR0,5, ≥ B2,0 and ≥ IR6 under AVCP system 4, with system 3 for reaction to fire.
4. Check for an EN 1504-2:2004 declaration only where the floor is also sold as surface protection under EN 1504 products and systems for the protection and repair of concrete structures.

How Do You Choose an Epoxy Floor System?#

Choose the build-up by traffic and exposure: thin roller coats for light foot traffic, broadcast or self-leveling builds of 1 to 4 mm (0.04 to 0.16 in) for wheels and wash-down, and moisture control first on a damp slab. Substrate moisture is the second filter: thin FeRFA Types 1 to 5, up to about 6 mm (0.24 in), suffer osmotic blistering on damp slabs, and FeRFA points to Types 6 to 8 or vapor-permeable systems there. The table below pairs six situations with a build-up and its FeRFA type.

Roller coat, self-leveling, broadcast and mortar build-ups by thickness#

Five layer types build every epoxy floor, from the primer on the slab to quartz-filled decorative systems; the thickness bands below follow FeRFA and the named data sheets.

• Primer: a penetrating first coat on the prepared slab and the base of every build; primer types are compared under concrete primers for coatings and resin floors.
• Roller coat: FeRFA Type 2, 150 to 300 µm (5.9 to 11.8 mil) dry film, for light and medium duty.
• Self-leveling epoxy: a filled, flow-applied wearing layer of FeRFA Type 5 at 2 to 3 mm (0.08 to 0.12 in), not the cement-based leveler covered under self-leveling concrete and underlayments.
• Broadcast system: resin layers with broadcast quartz and a seal coat, FeRFA Type 4 over 2 mm (0.08 in); the Sikafloor-264 N Thixo data sheet lists a 3 to 4 mm (0.12 to 0.16 in) broadcast system.
• Quartz and flake systems: the Dur-A-Quartz system runs at a nominal 3.2 mm (1/8 in) and the Dur-A-Chip flake system at a nominal 1.0 mm (40 mil), and color quartz, flake and metallic finishes are covered under decorative resin floors.

Epoxy mortar floors, trowelled resin screeds of FeRFA Type 6 over 4 mm (0.16 in), sit at the top of the epoxy range.

When is epoxy the wrong floor?#

Four conditions make epoxy the wrong floor, listed below with the class or measure that fits each one.

• Damp slabs above the maker's moisture limit: install moisture mitigation systems for concrete slabs first, or choose a vapor-permeable system.
• Exterior and sunlit floors: aromatic epoxy yellows and chalks under UV, so the epoxy needs an aliphatic topcoat or gives way to a UV-stable chemistry.
• Heat, thermal shock and hot wash-down: polyurethane cement floors at 6 to 12 mm (0.24 to 0.47 in) take heat and wash-down where a thin epoxy softens above its heat limit or debonds.
• Moving joints and active cracks: a rigid epoxy layer cracks over them, so joints are carried through the floor and cracks are treated before coating.

How Is an Epoxy Floor Applied? Substrate, Conditions, Coverage and Cure#

An epoxy floor fails or holds at the substrate, so the application part of a specification fixes four things: substrate strength and moisture, the climate during placing, the quantity per coat and the cure before traffic. Each value comes from the product data sheet, inside the limits of FeRFA guidance and ISO 8502-4:2017.

Substrate strength, profile and moisture#

The Sikafloor-264 N data sheet requires a substrate of at least 25 N/mm² (3,626 psi) compressive strength and 1.5 N/mm² (218 psi) pull-off strength, with laitance removed by abrasive blasting or planing and no rising moisture. FeRFA guidance calls for mechanical preparation by blasting, planing or grinding, advises against acid etching, and accepts a pull-off above 1.5 N/mm² (218 psi) or a rebound hammer reading above 25 as proof of a sound base. The profile that blasting or grinding leaves is graded against the ICRI chips described under concrete surface profile (CSP 1 to 10).

Moisture limits are the maker's: ASTM F2170-19a and F1869-23 set no pass or fail value, and FeRFA guidance names a surface RH of at most 75 % (BS 8203) unless the system is moisture tolerant. Sikafloor EpoCem, a three-component epoxy-cement that is impervious to liquids but permeable to water vapor, serves as a temporary moisture barrier above 4 % CM, and the epoxy topcoat follows once surface moisture reads below 4 % on a Tramex CME meter. A 150 mm (6 in) slab can take more than a year to dry from one face.

Temperature, humidity and the dew-point margin#

Epoxy floors go down inside a temperature, humidity and dew-point window printed for each product, and the table below sets one product's window beside the FeRFA guidance.

ISO 8502-4:2017 sets the 3 °C (5.4 °F) margin on the surface itself, not in the air, and US data sheets round it to 5 °F. A slab can sit 10 °C (18 °F) colder than the air above it (FeRFA guide). Gas and oil heaters add carbon dioxide and moisture, the two ingredients of amine blush. The three site checks are listed below.

• Surface temperature: a contact reading, at least one per 10 m² (108 ft²) with the lowest value used; ISO 8502-4:2017 rules out infrared thermometers for it.
• Relative humidity: air RH logged before and during application.
• Dew point: calculated from air temperature and RH and compared with the surface reading, for example with a dew point calculator for coating application.

Coverage per coat and per mm, wet and dry film thickness#

Epoxy floor coverage is a theoretical quantity per coat or per mm of thickness, printed for one product and rising on porous or rough concrete. The coverage identity links film and quantity: at 100 % volume solids, 1 US gallon covers 1,604 ft² at 1 mil dry film, and in metric units m²/L = 1,000 × volume solids ÷ DFT in µm. Dry film thickness (DFT) equals wet film thickness (WFT) times volume solids. As a worked example with inputs of 100 % volume solids and a 250 µm (9.8 mil) DFT, one liter covers 4.0 m²/L (163 ft²/gal) in theory. A wet-film gauge confirms the quantity on site, see wet and dry film thickness measurement.

The table below lists theoretical quantities per coat and per mm from three data sheets, with the basis of each value.

Data-sheet quantities are theoretical; area and kit counts from a chosen DFT are worked out in the epoxy and coating coverage calculator.

Epoxy floor cure, recoat and traffic times by temperature#

Epoxy floor cure, recoat and traffic times shorten as temperature rises, so each value in the table below is tied to 10, 20 or 30 °C (50, 68 or 86 °F) and to one named product. FeRFA guidance at 15 to 20 °C (59 to 68 °F) allows 1 to 3 days before significant traffic and 3 to 7 days before wet cleaning, chemicals or heavy traffic. A coat placed after the recoat window closes needs abrasion of the cured layer before it bonds.

How Are Epoxy Floors Inspected, and Why Do They Fail?#

Epoxy floors are checked before, during and after placing: moisture and dew point before, film quantity during, and bond, hardness and surface condition after. Pull-off testing to ASTM D7234-22 or EN 1542 measures bond on the finished floor, Shore D hardness is checked against the data-sheet value, and a DSC test to ASTM E1356-25 confirms the glass transition temperature where cure is in doubt.

Before a recoat, a water-wipe test detects blush, and a clean epoxy surface reads a pH of about 7 in field blush checks. The Euclid Chemical CP-29 guide traces soft or tacky patches to off-ratio or poor mixing. The table below pairs seven failures with their cause and the check that catches each one.

What Health, Safety and VOC Rules Apply to Epoxy Flooring?#

Liquid epoxy resin carries a harmonised CLP classification that includes skin sensitization, the main health risk for applicators, while grinding and blasting add respirable crystalline silica and the coating must meet a floor-coating VOC limit. The table below lists each classification and rule with its instrument and date.

Epoxy resin classification and skin sensitization#

Liquid epoxy resin (bisphenol A-epichlorohydrin, number average molecular weight at most 700) carries a harmonised CLP Annex VI classification under index 603-074-00-8: H315, H317, H319 and H411. Specific concentration limits for skin and eye irritation apply at 5 % or more, and H411 belongs to the harmonised entry itself, not to a supplier addition. The Sikafloor-264 N Part A SDS (2024) prints the same four codes. Hardeners differ by amine, so a Part B hazard line is read on the Part B SDS; isophorone diamine (IPDA), one hardener constituent, carries H302, H314, H317 and H318. REACH Annex XVII entry 74 on diisocyanates does not apply to epoxy-amine systems.

Silica dust from grinding and blasting#

Quartz (crystalline silica) has no Annex VI entry, no hazard statement reaches a majority of ECHA C&L notifications, and its classification is product-specific, so a filler's hazard is read on the product SDS. Grinding and shot blasting the slab release respirable crystalline silica, which OSHA 29 CFR 1926.1153 limits to a PEL of 50 µg/m³ with an action level of 25 µg/m³ (8-h TWA), effective 2016-06-23. Table 1 (xiii) of the rule requires floor grinders with integrated water delivery or a dust collector of at least 99 % filter efficiency, and its housekeeping clause bars dry sweeping.

VOC limits for epoxy floor coatings#

Epoxy floor coatings meet 50 g/L (0.42 lb/gal) under South Coast AQMD Rule 1113, 400 g/L (3.34 lb/gal) under the EPA AIM rule and 140 or 500 g/L (1.17 or 4.17 lb/gal) under EU Directive 2004/42/EC. Rule 1113 counts the limit less water and exempt compounds, and floor coatings never fall under Rule 1168. The 450 g/L figure in the federal table belongs to industrial maintenance coatings, not floors. Under the EU definition a VOC boils at or below 250 °C (482 °F) at 101.3 kPa, so reactive diluents that become part of the film are not counted while non-reactive benzyl alcohol is; the Sikafloor-264 N Part A SDS lists benzyl alcohol at 1 to < 2.5 %. The table below sets the limits side by side, and every other category is listed under VOC limits for construction chemicals.

What Drives the Installed Price of an Epoxy Floor?#

Installed thin-film epoxy floors cost USD 32.29 to 64.58 per m² (USD 3 to 6 per ft²) in the Legacy Industrial Coatings price ladder for Dallas-Fort Worth, dated 2026-10, on a 4,645 m² (50,000 ft²) basis. The same ladder (Legacy Industrial Coatings, US Dallas-Fort Worth, installed, 2026-10) lists high-build epoxy of 0.51 to 1.52 mm (20 to 60 mil) at USD 53.82 to 96.88 per m² (USD 5 to 9 per ft²) and a moisture mitigation add-on at USD 32.29 to 86.11 per m² (USD 3 to 8 per ft²). Price in that 2026-10 ladder rises with system thickness and filler. The table below repeats the three rows with their basis.

Ranges by system, region and date are compared in full under epoxy and resin flooring cost; contractor ladders are not quotes.

What Are the Alternatives to Epoxy Flooring?#

Five resin and concrete systems compete with epoxy, and each wins where UV stability, a faster return to service, heat resistance or a floor without a resin film decides the job. A hybrid build takes from both sides: an epoxy base coat for adhesion and build under a polyaspartic or polyurea topcoat for UV stability. Epoxy is the harder film and polyurethane the more flexible, and REACH entry 74 training applies to the isocyanate-based rows, not to epoxy floors. The table below compares the five alternatives, each with one named product value.

Epoxy Floor Grades, Packaging and Sourcing#

Epoxy floor products are sold as two- or three-component packs, and buyers compare them on solids content, the EN 13813 designation or US test data, the application window and the full documented system. FeRFA Types 2 to 8 call for an applicator, and the data sheet of the roller-coat product used on this page restricts installation to its maker's own contractor program. Data sheets and declarations are compared under construction chemicals manufacturers and suppliers.

The five checks below belong in a buyer's comparison of epoxy floor products.

• Solids content: 100 % solids or water-based, with the VOC declaration for the project's jurisdiction.
• Designation: EN 13813:2002 SR with declared B, AR or RWA and IR classes, or US test data with method editions.
• Application window: substrate and air temperature, RH limit and dew-point margin from the data sheet.
• System: primer, body coat, broadcast and seal coat documented as one build.
• Documents: declaration of performance, data sheet and an SDS for each component.

Where Does Epoxy Fit in a Resin Floor Specification?#

Epoxy is one layer of a specified resin floor, between a moisture-control or primer layer below and, where UV or slip matters, an aliphatic topcoat or a textured seal coat above. Below the epoxy, a two-component moisture mitigation membrane to ASTM F3010-24 reaches at most 0.10 perm by ASTM E96 Procedure B and a tensile bond of at least 1.38 MPa (200 psi) with failure in the concrete.

Edges and terminations set the outline of the floor. FeRFA guidance details a chase about as deep as the flooring is thick and about twice as wide, for example 10 mm (0.39 in) wide and 5 mm (0.20 in) deep for a 5 mm (0.20 in) floor.

Joints in the slab run through the resin layer as well, and their filling is a specification of its own, covered under semi-rigid joint fillers for industrial floors.

Epoxy flooring FAQs#

The six questions below come from searches on epoxy flooring.

Can epoxy flooring be used in a house?#

Yes: residential garages use the thinner FeRFA Type 2 to 4 builds, selected and placed as for any resin floor.

Is epoxy floor paint the same as an epoxy floor coating?#

"Epoxy floor paint" is a retail name, and what separates it from a floor coating is build: a Type 1 seal stays at or under 150 µm (5.9 mil), a Type 3 high-build coating runs 300 to 1,000 µm (11.8 to 39.4 mil).

Can a new epoxy coat go over an old epoxy floor?#

Yes, inside the recoat window printed for the product, which is 24 to 48 hours at 20 °C (68 °F) for Sikafloor-264 N. After the window closes, the old floor is abraded and tested for bond before the new coat goes on.

Is an epoxy floor slippery when wet?#

A smooth epoxy floor can be slippery when wet, so wet areas get a broadcast or textured finish.

FeRFA targets a pendulum test value (PTV) of at least 40 wet, or at least 33 where cleaning dominates and slip-resistant footwear is worn; textures and test values are compared under slip-resistant resin floors.

Does an epoxy floor need a primer?#

Yes: the Sikafloor-264 N system starts with a primer on the prepared concrete, and its data sheet forbids blinding the primer with aggregate.

How much area does 1 liter of epoxy cover?#

At 100 % volume solids, 1 liter covers 4.0 m² (43 ft²) at 250 µm (9.8 mil) dry film, before losses on porous concrete.