Epoxy terrazzo (thin-set terrazzo) is an advanced, fluid-applied $3/8”$-thick polymer composite. Engineered by combining 100% solids, zero-VOC epoxy resin with marble, granite, quartz, porcelain, or post-consumer glass aggregates, it provides high compressive strength, vibrant color possibilities, and rapid cure times for high-traffic commercial interiors.
Unlike traditional cementitious terrazzo systems—which are applied at $1.5” \text{ to } 2”$ thickness and can be used outdoors—epoxy terrazzo is designed specifically for interior spaces where low dead load, high tensile strength, and fast return-to-service are paramount.
Here is a technical specification breakdown and industry application guide for modern epoxy terrazzo flooring.
1. System Architecture & Section Detail
An epoxy terrazzo assembly is a bonded, multi-layer matrix designed to isolate structural stress while presenting a seamless, non-porous finish:
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| Layer 5: Penetrating Sealer / Fluorochemical Stain Shield |
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| Layer 4: Epoxy Terrazzo Matrix (3/8" Nominal Thickness) |
| 100% Solids Epoxy + Embedded Aggregate (1:4 to 1:5 Ratio) |
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| Layer 3: Divider Strips (L-Angle Zinc / Brass / Plastic) |
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| Layer 2: Crack Isolation & Waterproofing Membrane (40 mils WFT) |
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| Layer 1: Penetrating 100% Solids Epoxy / Moisture Vapor Barrier |
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| Substrate: Mechanically Profiled Concrete (ICRI CSP 3–4, FL 50) |
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2. Technical Performance Specifications (NTMA & ASTM Standards)
Architectural specifications (MasterFormat Division 09 66 23 – Resinous Matrix Terrazzo Flooring) mandate that epoxy terrazzo systems meet or exceed strict testing benchmarks established by the National Terrazzo and Mosaic Association (NTMA) and ASTM:
| Physical Property | ASTM Standard Method | NTMA / Engineering Minimum Threshold |
| Compressive Strength | ASTM C579 | $\ge 10,000\text{ PSI}$ |
| Tensile Strength | ASTM C307 | $\ge 3,000\text{ PSI}$ |
| Flexural Strength | ASTM C580 | $\ge 4,500\text{ PSI}$ |
| Flexural Modulus of Elasticity | ASTM C580 | $1.0\text{–}1.4 \times 10^6\text{ PSI}$ |
| Hardness (Barcol) | ASTM D2583 | $75\text{–}85$ |
| Bond Strength (Pull-Off) | ASTM C1583 / D4541 | $\ge 300\text{ PSI}$ (100% cohesive concrete failure) |
| Thermal Coefficient of Expansion | ASTM D696 | $25\text{–}30 \times 10^{-6} \text{ in/in/}^\circ\text{F}$ |
| Flammability / Critical Radial Flux | ASTM E648 | Class 1 ($\ge 0.45\text{ watts/cm}^2$) / Self-Extinguishing |
| Slip Resistance (DCOF) | ANSI/NFSI B101.3 | Wet $\text{DCOF} \ge 0.42$ / Wet $\text{SCOF} \ge 0.60$ |
| System Weight | N/A | $3.5\text{ to } 4.5\text{ lbs/sq. ft.}$ (at $3/8”$ DFT) |
3. High-Performance Sector Applications
Because of its chemical inertness, high impact resistance, and design flexibility, epoxy terrazzo is specified across primary commercial sectors:
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| EPOXY TERRAZZO SECTOR MATRIX |
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| Healthcare & Life Sciences --> Seamless Hygiene, Zero-VOC, No Grout |
| Transit Hubs & Airports --> Heavy Rolling Loads, High Foot Traffic|
| Higher Ed & Institutional --> 50+ Year Life, Low Lifecycle Cost |
| Corporate & Retail Flagships --> Bespoke Pigmenting, High Reflectivity|
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A. Healthcare & Life Science Facilities
- Critical Demands: Complete sanitization, zero VOC off-gassing, resistance to aggressive chemicals/spills, and seamless transitions to prevent bacterial growth.
- Why Epoxy Terrazzo: The non-porous cross-linked matrix resists biological growth, stains from medical dyes (povidone-iodine), and damage from heavy rolling beds or equipment without requiring sacrificial floor wax or chemical strippers.
B. Transportation Terminals & Transit Hubs
- Critical Demands: Resistance to extreme point loads (rolling luggage, foot traffic, utility carts), high slip resistance, and rapid maintenance turnarounds.
- Why Epoxy Terrazzo: With compressive strength exceeding $10,000\text{ PSI}$ and high impact resistance, it withstands millions of foot traffic cycles without surface wear or aggregate dislodgement.
C. Educational & Institutional Campuses
- Critical Demands: Long service life, custom emblem/logo inlay capabilities, low lifecycle costs, and low VOC emissions for indoor air quality (LEED EQ Credit 4.2).
- Why Epoxy Terrazzo: Intricate brass or zinc divider strips allow school crests, wayfinding lines, and custom geometric boundaries to be permanently embedded into the floor.
D. Corporate Lobbies & Retail Flagships
- Critical Demands: High specular clarity, vibrant color retention, and high ambient light reflectivity.
- Why Epoxy Terrazzo: Unlimited pigment possibilities allow designers to execute vibrant, high-contrast floor patterns that can be diamond-polished to a high-gloss finish ($1,500\text{ to } 3,000\text{-grit}$), reducing electrical lighting requirements through light dispersion.
4. Engineering & Execution Guidelines
Achieving a warrantable epoxy terrazzo installation requires strict substrate preparation and mechanical trade execution:
- Substrate Engineering: Mechanically shot-blast raw concrete slabs during Surface Preparation to achieve an ICRI CSP 3 to CSP 4 profile. Concrete moisture content must be evaluated via in-situ relative humidity probes (ASTM F2170); if readings exceed $80\%\text{ RH}$, apply a 100% solids epoxy moisture vapor barrier (MVB) meeting ASTM F3010.
- Subfloor Remediation: The concrete substrate tolerance must not exceed $1/8”$ variation in $10\text{ feet}$ ($F_L 50$). Flatten low spots and transitions using high-early-strength cementitious underlayments via Floor Leveling & Floor Flattening.
- Crack Isolation Membrane: Route dynamic cracks and apply a full-coverage flexible elastomeric epoxy membrane ($40\text{ mils}$ WFT) to prevent subfloor stress from telegraphing through the rigid terrazzo matrix.
- Divider Strip Placement: Set $3/8”$ L-angle zinc, brass, or plastic divider strips using 100% solids epoxy adhesive to define color boundaries and form control joints.
- Batching, Screeding & Seeding: Mix Part A and Part B epoxy resins, blend with clean aggregates at a 1:4 to 1:5 ratio by weight, trowel to $3/8”$ thickness, and seed additional aggregate onto the wet matrix before rolling.
- Multi-Pass Grinding & Polishing: Rough-grind with 24-to-36-grit metal-bond diamonds, squeegee matching epoxy grout to fill micro-pinholes, and progress through multi-pass Concrete Polishing sequences up to 3,000 grit before applying a breathable penetrating sealer.
Facility System Integration
Commercial facilities routinely coordinate epoxy terrazzo in public spaces with specialized protective coatings in utility and service corridors:
- Lobbies, Atriums & Public Corridors: Thin-set Epoxy Terrazzo or architectural Concrete Polishing.
- Exterior Plazas & Parking Structures: UV-stable elastomeric Traffic Toppings and low-VOC Parking Lot Line Painting.
- Mechanical Corridors & Storage: High-build Epoxy Coatings & Fluid Flooring.
- Commercial Kitchens & Washdown Bays: Thermal-shock-resistant Trowel-Applied Polyurethane Mortar Flooring.
- Vehicle Bays & Service Garages: Hot-tire-resistant Garage Epoxy Coatings.
Partner with Resinous & Terrazzo Specialists in Ontario
Specifying and executing high-performance thin-set epoxy terrazzo requires precision batching, heavy planetary grinding equipment, technical subfloor remediation, and NTMA-compliant trade craftsmanship.
At AK Level & Polish, we deliver expert substrate profiling via Surface Preparation, subfloor remediation via Floor Leveling & Floor Flattening, architectural Concrete Polishing, elastomeric Traffic Toppings, and high-performance fluid flooring across Toronto, the Greater Toronto Area, and Southern Ontario.
Looking to specify or install an epoxy terrazzo system for your commercial or institutional project? Contact AK Level & Polish today to schedule an on-site technical consultation and request a detailed proposal.
Contact Information
AK Level & Polish Inc.
📍 895 Don Mills Rd. Suite 900, Toronto, ON M3C 1W3
📞 +1 (647) 768-8517
✉️ aklevelandpolish@gmail.com
