Terrazzo Flooring Construction: The Specialty Cementitious and Epoxy Flooring for Premium Commercial Spaces
Terrazzo flooring combines aggregate (marble chips, glass, mother-of-pearl, or other) with cementitious or epoxy matrix producing distinctive, durable flooring with substantial design flexibility. Cementitious terrazzo traditional with cement matrix; epoxy terrazzo modern with epoxy matrix offering broader color range and faster installation. Substantial coordination during construction — multiple trades, divider strips, polishing. Long-life premium flooring (50+ years) increasingly used in lobbies, retail, healthcare, schools, and institutional. Understanding terrazzo helps GCs coordinate this specialty trade.
This post covers terrazzo flooring construction.
Two main terrazzo types:
Cementitious vs epoxy
- Cementitious: traditional cement matrix
- Epoxy: modern resin matrix
- Cementitious thicker (1.5-2 inches)
- Epoxy thinner (3/8-1/2 inch)
- Cementitious longer set time
- Epoxy faster installation
- Epoxy broader color range
- Specific to project preference
Two main terrazzo types. Cementitious terrazzo traditional with Portland cement matrix. Epoxy terrazzo modern with epoxy resin matrix. Cementitious thicker installation (1.5-2 inches). Epoxy thinner (3/8-1/2 inch typical). Cementitious longer set time and installation duration. Epoxy faster installation — substantial schedule benefit. Epoxy broader color range and design flexibility. Specific to project preference — traditional projects use cementitious, modern often epoxy.
Aggregate drives appearance:
Aggregate selection
- Marble chips (traditional)
- Glass aggregate (recycled)
- Mother-of-pearl
- Onyx, granite
- Logos and patterns possible
- Specific colors and sizes
- Substantial design flexibility
Aggregate drives terrazzo appearance. Marble chips traditional in various colors. Glass aggregate (often recycled) modern with bright colors. Mother-of-pearl for shimmer effect. Onyx, granite, other stone aggregates. Logos and patterns possible through specific aggregate placement. Specific colors and sizes per design. Substantial design flexibility — terrazzo can match many aesthetic visions.
Divider strips control:
Divider strips
- Brass, zinc, or aluminum
- Control cracking
- Define design patterns
- Specific spacing
- Specific to design
- Substantial labor in placement
- Quality affects appearance
Divider strips control cracking and define design. Brass (traditional, high-end), zinc, or aluminum (cost-effective alternatives). Control cracking by limiting individual panel size. Define design patterns including geometric shapes, logos, transitions. Specific spacing per design and material requirements. Specific to design including straight lines, curves, custom shapes. Substantial labor in precise placement. Quality affects appearance substantially — strip quality and placement noticed.
Substrate critical for terrazzo:
Substrate preparation
- Concrete substrate cured fully
- Specific moisture content (epoxy)
- Surface preparation (shot-blasting typical)
- Crack repair before terrazzo
- Specific to terrazzo type
- Vapor barrier considerations
Substrate preparation critical for terrazzo performance. Concrete substrate cured fully (60-90 days typical for cementitious; less critical for epoxy with vapor barrier). Specific moisture content critical for epoxy adhesion. Surface preparation through shot-blasting typical achieving substrate profile. Crack repair before terrazzo prevents reflection through. Specific to terrazzo type — cementitious tolerates more substrate variation. Vapor barrier considerations on slabs-on-grade.
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Installation multi-step:
Installation process
- Substrate preparation
- Divider strip installation
- Terrazzo placement (poured, troweled)
- Curing (cementitious) or initial cure (epoxy)
- Grinding (rough then progressively finer)
- Grouting (filling pinholes)
- Final polishing
- Sealing and protection
Installation multi-step process. Substrate preparation. Divider strip installation per layout. Terrazzo placement — poured into bays formed by dividers, troweled to consistent depth. Curing (cementitious) or initial cure (epoxy) before grinding. Grinding (rough then progressively finer grits) reveals aggregate and produces flat surface. Grouting fills pinholes between aggregate. Final polishing produces smooth glossy finish. Sealing and protection.
Coordination essential:
Coordination
- Substrate preparation timing
- Building enclosed (heat, no contamination)
- Other trades complete adjacent
- Specific schedule constraints
- Curing time before traffic
- Protection during remaining construction
Coordination essential for terrazzo. Substrate preparation timing ensures concrete cured properly. Building enclosed (heat, no contamination) before terrazzo work. Other trades complete adjacent work avoiding subsequent damage. Specific schedule constraints — terrazzo near end of finish work to avoid damage. Curing time before traffic. Protection during remaining construction critical — terrazzo damage substantial cost to repair.
Terrazzo failures often trace to substrate moisture or crack issues. Quality substrate preparation, moisture testing for epoxy, and crack repair prevent failures. Terrazzo failure remediation is exceptionally expensive — typically requires substantial demolition and replacement. Quality substrate diligence at construction prevents costly remediation. Long-life material justifies thorough preparation.
Maintenance preserves terrazzo:
Maintenance
- Regular cleaning (daily mopping)
- Sealing periodically
- Repolishing as needed (every 5-10 years)
- Crack repair if needed
- Specific to traffic
- 50+ year life with proper maintenance
Maintenance preserves terrazzo over decades. Regular cleaning with appropriate cleaners (no harsh acids). Sealing periodically for stain resistance. Repolishing as needed every 5-10 years restores gloss. Crack repair if needed (often by terrazzo specialty contractor). Specific to traffic — high-traffic areas need more maintenance. 50+ year life with proper maintenance — terrazzo most durable commercial flooring with appropriate care.
Terrazzo flooring is specialty premium flooring combining aggregate with cementitious or epoxy matrix. Cementitious traditional, epoxy modern with broader color range and faster installation. Aggregate selection drives appearance. Divider strips control cracking and define design. Substrate preparation critical. Installation multi-step including grinding and polishing. Coordination essential during construction. Maintenance preserves over 50+ year life. For GCs serving institutional, commercial, and high-end retail clients, terrazzo coordination is specialty deserving expertise. Quality terrazzo construction supports premium aesthetic over decades; deficient construction (substrate issues, cracking, poor finishing) requires expensive remediation. Premium specialty flooring deserving careful execution.
Written by
Marcus Reyes
Construction Industry Lead
Spent twelve years running AP at a $120M general contractor before joining Covinly. Lives in the world of AIA G702/G703, retainage schedules, and lien waiver deadlines. Writes about the construction-specific workflows that generic AP tools get wrong.
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