Terrazzo Flooring Systems: Selection & Specification Guide

Founded in 1999 • National commercial & industrial technical flooring contractor
High-spec systems: ESD/static-control flooring, urethane cement, terrazzo, polished concrete, resinous flooring & coatings, and concrete overlays
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Current prequalification documents available through controlled review, including COI, W-9, safety information & other current qualification records
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Company: Craftsman Concrete Floors

Phone: +1 (844) 687-1961

Email: projects@craftsmanconcretefloors.com

Headquarters: 1011 Folsom Street, Dallas, TX 75208

Hours: Mon–Fri 8 am–5 pm

Terrazzo is not one product but a finish delivered through several distinct flooring systems: resin-matrix (epoxy) terrazzo, cementitious terrazzo in monolithic and sand-cushion forms, polyacrylate terrazzo, precast terrazzo, and terrazzo tile. They differ in build-up, thickness, weight, substrate, moisture tolerance, exterior suitability, and joint design, so choosing among them is a specification decision rather than a finish preference.

This guide compares the terrazzo flooring systems side by side and walks through the selection sequence a specifier can follow: use, substrate, moisture, exposure, build-up and load, appearance, joints, schedule, maintenance, lifecycle, and budget. It is a selection guide rather than a project specification—the reference values are published NTMA system options and named institutional and product examples, and the selected products’ current data sheets, project testing, and submittals set the final numbers for any job. For an orientation to terrazzo as a category, start with the terrazzo hub; for installed-cost and lifecycle numbers, see the terrazzo cost guide.

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The terrazzo flooring systems, side by side

Six systems cover most commercial terrazzo work. They share the same basic idea—decorative aggregate in a binder, ground and polished to a continuous surface—but they are not interchangeable. The quick reference below compares them; the profiles that follow give the thickness, weight, and substrate detail behind each one, with sources.

Quick selection reference

Use this as a first cut, then confirm every value against the selected product’s current data and the project’s own testing.

System / format	Build-up	Nominal thickness	Approx. weight	Substrate & bond	Selection notes
Epoxy (resin-matrix)	Thin resin-and-aggregate topping	See epoxy detail below	See epoxy detail below	Bonded to prepared concrete	See the scoped GSA example and product-data discussion below
Monolithic cementitious	Cement-and-aggregate topping, no thick underbed	See monolithic detail below	System-specific	Direct bond; the systems reference describes it as an interior system	Performance depends on slab flatness and crack-control design
Sand-cushion cementitious	Topping over sand, isolation sheet, reinforcement, underbed	See sand-cushion detail below	See sand-cushion detail below	Isolated from the structural slab	Isolates the topping from slab movement; added depth/load needs structural review; still requires crack-control design
Polyacrylate	Polymer-modified cement topping	See polyacrylate detail below	System-specific	Bonded	The published systems reference identifies it where moisture-vapor or limited replacement depth affects selection; product data sets the moisture limit
Precast	Elements cast, ground, and polished off-site, then installed	Element-specific	Element-specific	Set/anchored as elements, not a poured field floor	Stairs, treads, cove base, countertops, cladding; Craftsman fabricates in-house
Terrazzo tile	Factory-made tile set with grout joints	Product-specific	Product-specific	Set in mortar/adhesive by the setting contractor	Large-format can be ground/polished to read closer to monolithic; small-format carries more grout-line maintenance

The table is a routing aid. System-specific values and their scoped sources appear in the corresponding sections below.

Epoxy (resin-matrix) terrazzo

Epoxy terrazzo is a thin-set system: a resin-and-aggregate topping bonded directly to a prepared concrete slab. The published epoxy-terrazzo system reference describes epoxy terrazzo options at nominal 1/4-inch thickness with #0 and #1 aggregate, or nominal 3/8-inch thickness when #2 aggregate is used. General system weight is approximately 3–4 pounds per square foot.

For GSA-owned federal projects, the 2024 P100 durability table lists cementitious polyacrylate terrazzo at a 3/8-inch baseline and epoxy terrazzo at a 1/4- or 3/8-inch Tier 3. Because it is thin and bonded, epoxy terrazzo rises or falls on substrate readiness and moisture, both covered below; the epoxy terrazzo page covers resin mechanical data and installation in depth.

Cementitious terrazzo: monolithic and sand-cushion

Cementitious terrazzo uses a cement binder and comes in two very different build-ups. Monolithic cement terrazzo is a direct-bond interior system with a nominal 1/2-inch topping and no thick underbed. Its performance depends heavily on slab flatness and crack-control design. Sand-cushion terrazzo separates the terrazzo assembly from the structural slab with an underbed, reinforcement, isolation sheet, and sand layer. The complete assembly is approximately 2 1/2 to 3 inches thick, includes a nominal 1/2-inch terrazzo topping, and weighs approximately 25–30 pounds per square foot.

Those figures describe the assembly thickness and weight, not just the topping. That isolation is the reason to consider sand-cushion: it buffers the topping from movement in the slab below. The floor still needs a coordinated crack-control and joint plan, and the added depth and dead load call for structural review early in design. This monolithic-versus-isolated contrast is the practical core of the epoxy-versus-cement terrazzo question: resin systems are thin and bonded, while cement systems range from a thin bonded topping to a thick isolated assembly.

Polyacrylate terrazzo

Polyacrylate terrazzo is a polymer-modified cement system with a nominal 3/8-inch topping. The published systems reference identifies it for projects where moisture-vapor conditions or limited replacement depth affect system selection. The GSA example is stated in the preceding system section. The moisture limit that applies to a given slab is the selected product’s own, read from its current data sheet and confirmed by slab testing. Availability varies by supplier and region, so confirm the product line early when polyacrylate is a candidate.

Precast terrazzo and terrazzo tile

The last two formats are not poured-in-place field floors. Precast terrazzo is made from elements cast, ground, and polished off the floor and then installed—stairs and treads, cove base, countertops, and wall panels or cladding. Craftsman fabricates precast terrazzo in-house and installs it; the precast terrazzo page covers each element in depth.

Terrazzo tile is a factory-made tile set with grout joints by a setting contractor, which is a different format from a monolithic pour: large-format commercial terrazzo tile can be ground flat and polished after setting so it reads closer to monolithic—Craftsman performs that grind-and-polish finishing scope in collaboration with the setting contractor—while small-format terrazzo tile is a budget product that carries more grout-line and seam maintenance. Craftsman does not set or install terrazzo tile as a standalone service; the terrazzo tile page has the full comparison.

Selecting a system: a specification sequence

System selection is easier as an ordered sequence than as a single verdict, because the early answers usually eliminate most of the field before appearance is even on the table.

The decision sequence

Work the decision roughly in this order:
– intended use and traffic;
– substrate type and condition;
– moisture in and under the slab;
– interior or exterior exposure;
– allowable build-up, thickness, and dead load;
– appearance, aggregate, and divider design;
– joint and crack-control coordination;
– transitions to adjacent finishes;
– construction schedule and cure time; maintenance program;
– expected lifecycle; and
– budget.

Use tends to narrow the field first, and institutional standards show how specific owners resolve it: the 2021 U.S. Courts Design Guide directs certain public-circulation courtroom areas to terrazzo or stone and identifies polished concrete as unacceptable in those areas; FGI application guidance calls for seamless flooring with an integral 6-inch cove in identified critical clinical environments, including procedure and operating rooms, subject to the adopted FGI edition and the authority having jurisdiction; and an Airport Cooperative Research Program synthesis identifies smooth monolithic terrazzo as reducing surface transitions and qualitatively improving baggage-cart rolling compared with carpet or jointed tile.

Read documents like these the way their owners intend—each governs its own facilities—and let the project’s own program documents play the same role in the sequence. Lifecycle and budget close the sequence; the terrazzo cost guide compares installed-cost and ownership-cost models and the assumptions that drive them.

Moisture vapor, dew point, and substrate readiness

Moisture is where many terrazzo selections are won or lost, and each system’s limits come from its own product data. One Morricite installation guide limits untreated-concrete moisture-vapor emission to 3.0 pounds per 1,000 square feet per 24 hours under ASTM F1869 and requires the slab surface to remain at least 5°F above ambient dew point during placement.

Limits like these differ from product to product, so the working method is to test the slab, read the selected system’s current data sheet, and resolve any gap—through mitigation, a different system, or the manufacturer’s review—before placement is scheduled. Where moisture-vapor conditions or limited replacement depth drive the choice, the published systems reference identifies polyacrylate terrazzo as one option to evaluate.

Exterior exposure and freeze-thaw

Exterior terrazzo is decided system by system and detail by detail rather than by a blanket rule. The published rustic-terrazzo specification prohibits sand-cushion rustic terrazzo outdoors where trapped water can freeze because freeze-thaw exposure can deteriorate the underbed. This restriction is specific to underbed assemblies in freezing exposure, so other systems are evaluated on their own freeze-thaw, drainage, and slip details.

Rustic terrazzo can range from approximately 1/2 inch to 6 inches in total assembly depth, depending on whether its base is monolithic, bonded, or sand cushion. It is a textured finish often considered for wet or exterior areas; the published rustic-system table and freeze-thaw restrictions remain the cited basis. Resolve exterior use, drainage, and slip requirements with the manufacturer and the project’s structural and civil documents.

Sound-rated (acoustic) assemblies

Where an assembly has to control impact sound, an acoustic membrane goes under the terrazzo, and the membrane’s own data sheet drives the preparation. The Terroxy Acoustical Membrane data sheet requires concrete to cure at least 28 days without curing agents and calls for shotblasting to an ICRI CSP 3–5 profile. The membrane is applied at 1/8 inch; its flexible epoxy is reported at 140–160% elongation and contains recycled rubber.

Requirements like these vary from membrane to membrane, which is why an acoustic terrazzo specification names the selected membrane, incorporates its current data sheet, and coordinates the added build-up with the floor’s overall thickness and its transitions to adjacent finishes.

Request a Proposal

Submit project parameters for preliminary analysis. Commercial estimates typically returned within 24 hours.

Writing the terrazzo specification

A terrazzo specification controls two things no reference table can: how the floor looks and how it handles movement. The rest is coordination—who resolves what, and with which documents.

Divider strips, aggregate, and crack control

Aggregate size and divider layout are specification decisions with a performance side. Published aggregate gradations run from sizes 0 through 5, and Venetian terrazzo uses sizes 1 through 5; epoxy-terrazzo divider strips may be zinc, brass, plastic, or aluminum, with system design governing which aggregate size and divider material work together. The critical caution is that divider strips placed for decoration do not prevent cracking.

Movement-joint and crack-control requirements must be coordinated with the concrete and project documents. Locate the applicable measures from the structural design and concrete documents, carry them into the terrazzo layout through designer-installer coordination, and let the divider layout serve the design once the joint plan is set.

Samples, mockups, and acceptance

Aggregate blend, matrix color, and divider layout vary by design, so the accepted appearance is set by approved samples and, on larger projects, a mockup rather than by a catalog number. Have the specification require both and name the acceptance basis: an approved sample range for color and aggregate, and the mockup for finish and divider execution.

Traction is specified the same way—the published sealer reference guide directs designers to the sealer supplier for the applicable coefficient-of-friction data and test method, and installed traction also depends on finish, contamination, moisture, and maintenance—so tie the slip requirement to the selected sealer’s tested data and confirm the finish on the mockup. Aggregate, divider, sample, and mockup decisions run through terrazzo design and samples.

Installation and closeout responsibilities

A workable specification assigns responsibilities without scripting any contractor’s proprietary means and methods. On most projects: the designer selects the system and sets the appearance, joint, and transition intent; the concrete contractor delivers a slab that meets the selected system’s flatness and moisture criteria; the terrazzo installer confirms substrate readiness, moisture-vapor, and dew-point conditions against the product data before placement, coordinates movement joints with the structural documents, and prepares any specified membrane to its data sheet; the manufacturer supplies current product data and reviews unusual conditions; the general contractor sequences the work and protects the finished floor through the rest of construction; and the owner sets the maintenance expectations the finish and sealer have to serve.

Temporary protection is itself sometimes specified—UW–Madison’s terrazzo specification requires a removable two-coat sacrificial polyurethane barrier during construction. Final polishing and sealer selection close out the work, with the sealer chosen for the required traction and stain behavior.

From this guide to your project specification

From this page a specifier can set the shortlist: which system families fit the use, roughly what build-up and weight each implies, and which questions the project has to answer next. The variables that separate the finalists are project conditions—substrate type, condition, and flatness; measured slab moisture; the movement-joint plan; interior, wet, or exterior exposure; finish and traction targets; divider and aggregate design; the maintenance program; and how the floor meets adjacent assemblies.

Each has a home in the project documents: the specification names the system, products, and acceptance criteria; the product data sheets carry the moisture limits, preparation requirements, and cure behavior of what was actually selected; the testing program confirms the slab; submittals, samples, and the mockup lock appearance and finish; and preconstruction review assigns the responsibilities above before the work is sequenced.

Bring the manufacturer and installer in early whenever a project pushes past routine conditions—elevated slab moisture, exterior or freeze-thaw exposure, acoustic assemblies, renovation over an existing slab, or unusual loads—because those are the cases where the selected system’s own data and a project-specific review decide the outcome.

Keeping requirement classes separate in the terrazzo specification

A terrazzo section reads cleanly when each requirement answers exactly one kind of question. Four classes do the technical work—performance, system, product, and installer—and procurement adds eligibility criteria of its own. When the classes stay separate, every bid can be checked against the same stated terms; when they blur, substitution reviews and bid comparisons turn into arguments about what the specification meant.

Performance requirements: what the installed floor must do

Performance requirements state the outcome the owner is buying: the approved appearance range and finish, the traction target tied to the selected sealer’s tested data, the moisture conditions the system must tolerate, how the floor handles the slab’s movement joints, and the cleanability and maintenance expectations the finish has to serve. Write them so each is verifiable—against the approved sample and mockup, the sealer supplier’s test data, the project’s moisture testing, and closeout documentation—because a performance requirement that cannot be checked at acceptance is a preference, not a requirement. Performance terms deliberately do not name an assembly or a vendor; more than one system can meet the same performance language, and the next two classes narrow that field.

System requirements: the assembly being selected

System requirements define the assembly itself: the binder family (resin or cementitious, including polyacrylate), direct-bond or underbed construction, nominal topping thickness and total build-up, any acoustic membrane, and the divider and joint approach. This is the class the comparison and sequence earlier on this page feed—in specification terms, they are the system decision. State the system by its defining features rather than by one manufacturer’s trade name, and the nominal values in the published system references become checkable terms: a bid proposing a different build-up is visibly a different system, not a judgment call. Two floors can carry the same performance language and still be different systems; the system class is where that difference is pinned down.

Product requirements: named materials and the equivalent path

Product requirements name the actual materials—matrix or resin system, membrane, divider strips, sealer—when the design or the site conditions depend on them, because the governing moisture limits, preparation requirements, and cure behavior live in the named product’s current data sheet. When the specification allows equivalents, define the path in the same breath: what submittal data a proposed equivalent must provide, which properties it must match, who accepts it, and by when in the schedule. A named product with a defined equivalent path keeps competition open without surrendering the data-sheet limits the installation depends on; “or equal” with no stated basis does the opposite.

Installer qualifications: demonstrated execution capability

Installer qualifications describe what the installing organization must have done and be able to show: completed commercial projects in the specified system rather than terrazzo in general, an identified crew and supervision structure, safety and prequalification documentation, and successful execution of the project mockup. These are capability facts a bidder demonstrates, not attributes a bidder declares. Keep them stated separately from performance, system, and product terms, so a strong product submittal cannot substitute for missing system experience—and vice versa. For the contractor-evaluation depth behind these questions—who employs and supervises the crew, documentation, and bidder independence—see the terrazzo contractors page.

Where trade-association membership fits

Some terrazzo specifications also make membership in a trade association an eligibility requirement for bidders. Where a project’s documents include one, it operates as a procurement-eligibility criterion: it defines who may bid, and a bidder either holds the membership or does not. It is not a substitute term for the four classes above—membership by itself does not state what the floor must do, which assembly is being bought, which products govern, or what execution capability a bidder has demonstrated—so a specification that uses it still writes out its performance, system, product, and installer requirements in full. Stating the eligibility criterion as its own line item, next to the four requirement classes rather than blended into them, keeps every bid reviewable against the same terms.

Name the entities behind the bid

Commercial terrazzo work can involve more than one company: the entity submitting the bid, the entity signing the contract, the fabricator of precast elements, material suppliers, the employer and supervisor of the installing crew, the entity issuing the floor’s warranty, and the entity that returns to perform corrective work if something fails. Bid documents work best when they ask each bidder to identify these legal entities by name and relationship, because acceptance criteria, warranty responsibility, and corrective-work obligations attach to specific companies, not to a team description. When the same entity fills several of those roles, the answer is short; when it does not, the owner learns before award who actually stands behind each obligation, while alternatives are still on the table.

Equivalents and substitutions: decide them on the record

However a specification handles equivalents—an alternate product, an alternate system build-up, or a bidder qualifying under an alternate showing—the process works when it is deliberate and documented: the request arrives through the stated channel, the submitted evidence addresses the stated basis for equivalence, the decision is made by the party the documents assign, and the outcome is recorded with the reasons. Projects governed by formal procurement rules—public work especially—already carry their own requirements for how substitutions and qualifications are evaluated, and the project’s process needs to be consistent with whatever rules apply to it. A documented equivalence decision protects everyone: the owner can show why an alternate was accepted or declined, and bidders know the basis on which their proposals will be judged.

Specifying terrazzo with Craftsman Concrete Floors

Craftsman Concrete Floors is a national commercial and industrial technical flooring contractor, founded in 1999, whose in-house W-2 installation crews mobilize nationwide. On terrazzo, that translates into a defined scope and a specification-stage way of working with architects, owners, consultants, and general contractors.

Craftsman’s terrazzo scope

Craftsman installs poured-in-place terrazzo, the system it recommends where a monolithic result is the goal. It also fabricates precast terrazzo in-house—stairs and treads, cove base, countertops, and wall panels or cladding cast, ground, polished, and installed by the same company rather than sourced from an outside fabricator—a demanding, skilled line of work and a significant part of the business.

On large-format commercial terrazzo tile, Craftsman performs the grinding-flat and polishing scope in collaboration with the setting contractor, the mechanical finishing that makes large-format tile read closer to monolithic. Craftsman does not set or install terrazzo tile as a standalone service and does not serve small-format residential tile; installation labor is performed by W-2 employees, not 1099 day-labor.

Where to go deeper

These related resources carry the detail behind each decision above.

Terrazzo hub — category overview and service orientation
Epoxy terrazzo — resin-system depth, product data, and procedures
Precast terrazzo — in-house-fabricated stairs, cove base, and elements
Terrazzo tile — where tile fits and the full comparison
Cost guide — installed cost and lifecycle economics
Terrazzo contractors — contractor evaluation and bidder independence
terrazzo design and samples — aggregate, color, and divider selection
Cleaning and maintenance — care, densifiers, and sealers
Restoration — repair, crack treatment, and matching

Bring Craftsman in during specification

The most useful time to involve Craftsman is while the system is still being chosen. Initial consultation and initial design and specification assistance are available at no cost, which is not a promise of unlimited design, engineering, testing, mockups, or revisions. A project specialist responds within one business day, and with basic size, system, condition, and schedule inputs Craftsman can usually give a preliminary installed-cost range during the initial call or within a few hours—useful for early budgeting, though not a formal proposal or guaranteed price. Commercial estimates are typically returned within 24 hours, with complex bids sometimes taking longer. Pre-bid walkthroughs are available within regional drive radius, remote specification review is standard for multi-region work, and repeat or multi-location accounts may use a Master Service Agreement and one contract vehicle for recurring work. To start, call +1 (844) 687-1961 or email projects@craftsmanconcretefloors.com.

Terrazzo Services We Offer

Terrazzo Floor Installation Terrazzo Design Services Existing Terrazzo Color & Aggregate Matching

Terrazzo Restoration Terrazzo Polishing, Cleaning & Maintenance Terrazzo Countertops

Frequently Asked Questions

Commercial work generally uses six systems: epoxy (resin-matrix) terrazzo, monolithic cementitious terrazzo, sand-cushion cementitious terrazzo, polyacrylate terrazzo, precast terrazzo, and terrazzo tile. They differ in binder, build-up, thickness, weight, and how they treat the slab, so the system is chosen from the project’s use, substrate, moisture, and exposure rather than by appearance alone.

The published epoxy-terrazzo system reference describes epoxy terrazzo options at nominal 1/4-inch thickness with #0 and #1 aggregate, or nominal 3/8-inch thickness when #2 aggregate is used. General system weight is approximately 3–4 pounds per square foot. Sand-cushion terrazzo separates the terrazzo assembly from the structural slab with an underbed, reinforcement, isolation sheet, and sand layer. The complete assembly is approximately 2 1/2 to 3 inches thick, includes a nominal 1/2-inch terrazzo topping, and weighs approximately 25–30 pounds per square foot. The practical differences are thickness, weight, and whether the topping is bonded to or isolated from the slab; moisture conditions and product data decide which one fits a given floor.

It depends on the system. Published system references list epoxy terrazzo at a nominal 1/4 inch (with #0–#1 aggregate) or 3/8 inch (with #2 aggregate); monolithic and sand-cushion cementitious systems use a nominal 1/2-inch topping, though a sand-cushion assembly totals about 2 1/2 to 3 inches with its underbed; polyacrylate uses a nominal 3/8-inch topping; and rustic terrazzo can run from about 1/2 inch to 6 inches depending on its base. These are nominal system options; the selected product’s data sets the final build-up.

Some terrazzo can be used outdoors, but it is decided per system and detail rather than as a blanket rule. The published rustic-terrazzo specification prohibits sand-cushion rustic terrazzo outdoors where trapped water can freeze because freeze-thaw exposure can deteriorate the underbed. Exterior use, drainage, texture, and slip requirements should be worked out with the manufacturer and the project’s structural and civil documents.

No. Divider strips placed for decoration do not prevent cracking. Movement-joint and crack-control requirements must be coordinated with the concrete and project documents. Treat crack control as part of the structural design, not something the decorative divider layout handles on its own.

Start with use, then substrate, moisture, and exposure—those usually narrow the field before appearance, joints, schedule, maintenance, lifecycle, and budget finish the decision. Because the controlling limits such as moisture-vapor, traction, and thickness are product- and project-specific, the most reliable path is to confirm candidate systems against current product data and, where it helps, bring Craftsman in during specification for a no-cost initial review.

No. A specification may make trade-association membership an eligibility requirement for a particular project, and where it does, it is one procurement criterion alongside the others. On its own, membership does not establish who employs and supervises the installing crew, completed experience in the specified system, safety practice, quality control, bonding, closeout capability, warranty responsibility, or how the entities bidding a project are related. A well-drafted specification states membership, where used, as its own eligibility item and states installer qualifications separately as demonstrated execution capability, so each can be verified on its own terms.

Terrazzo Flooring Systems: Selecting and Specifying the Right Floor