Quick answer — which ASTM standard should you actually use for limestone pavers?
For natural quarried limestone pavers used in exterior paving applications, reference ASTM C568 (Standard Specification for Limestone Dimension Stone). C936 governs concrete interlocking pavers and does not apply to natural stone. C503 covers marble dimension stone and may offer useful parallels for certain white limestone varieties. Request complete technical data sheets and ASTM-referenced test reports from Citadel Stone to verify compliance with C568 material categories and performance test methods including C97 absorption, C99 modulus of rupture, and C241 abrasion resistance.
Verification note: Standards, test reports and performance claims should be verified by reviewing original ASTM documents, laboratory reports and Citadel Stone TDS. Consult licensed design professionals for project-specific code and installation decisions. This article is informational.
Why the confusion exists — concrete pavers, marble standards, and dimension stone families
The term “paver” creates immediate ambiguity in specifications. In the hardscape industry, “paver” often refers to concrete interlocking units governed by ASTM C936. In the natural stone trade, “paver” describes cut dimension stone tiles or slabs used for paving—materials governed by stone-specific standards like C568 for limestone or C503 for marble.
Marketing materials frequently use “limestone paver” without clarifying whether the product is natural quarried stone or a concrete unit with limestone aggregate. This linguistic overlap causes specifiers to inadvertently reference C936 when procuring natural limestone dimension stone, creating contractual conflicts and procurement delays.
ASTM C936 exclusively covers manufactured concrete interlocking paving units—precast products with specific dimensional tolerances and concrete-based performance requirements. ASTM C503 addresses marble dimension stone, establishing classification systems and recommended tests for calcitic stone. ASTM C568 is the dimension stone standard specifically written for limestone, covering calcitic stone classification, physical property categories, and procurement requirements.
Natural Stone Institute resources and ASTM’s own scope statements clearly delineate these boundaries. Specifiers must distinguish between manufactured concrete products (C936) and quarried dimension stone (C568 for limestone, C503 for marble) to write enforceable specifications and request appropriate supplier documentation.
ASTM C936 explained — what it actually covers and why it’s not for natural limestone pavers
ASTM C936 establishes requirements for concrete interlocking paving units manufactured from Portland cement, aggregate, and admixtures. The standard addresses manufacturing tolerances, dimensional requirements, compressive strength of the concrete matrix, freeze-thaw durability testing specific to concrete pore structures, and abrasion resistance of manufactured surfaces.
The scope explicitly limits application to “interlocking concrete paving units” intended for pedestrian and vehicular applications. Test methods reference concrete-specific protocols including absorption testing that measures concrete porosity, not the absorption characteristics of natural calcitic stone. Freeze-thaw testing evaluates concrete deterioration mechanisms that differ fundamentally from natural stone weathering behavior.
Specifying C936 for natural limestone creates several problems. Suppliers cannot provide compliant test data because limestone is not concrete. Dimensional tolerances for interlocking concrete units do not align with sawn or thermally finished dimension stone tolerances. Absorption and strength testing protocols designed for concrete yield misleading results when applied to natural stone. Contractually, referencing the wrong standard may void warranty provisions or create grounds for material rejection.
Table: ASTM C936 Summary
| Clause Area | What It Covers | Why Not Applicable to Limestone Pavers |
|---|---|---|
| Scope | Concrete interlocking paving units manufactured from cement and aggregate | Natural limestone is quarried dimension stone, not manufactured concrete |
| Materials | Portland cement, aggregate, admixtures per concrete specifications | Limestone is calcitic sedimentary rock with no cement binder |
| Physical properties | Concrete compressive strength, absorption as measure of concrete porosity | Natural stone uses different property tests; absorption measures inherent stone porosity |
| Freeze-thaw | Evaluates concrete deterioration through scaling and mass loss | Limestone weathering behavior differs; dimension stone uses C666 or field exposure |
| Abrasion | Concrete surface wear using rotating cutter method | Dimension stone uses C241 or Taber abrasion with different specimen preparation |
| Tolerances | Dimensional tolerances for interlocking concrete unit fit | Sawn stone uses ASTM C1528 dimensional tolerances for dimension stone |
ASTM C503 explained — marble dimension stone and useful parallels
ASTM C503 provides the standard specification for marble dimension stone, covering calcitic and dolomitic stone used in building construction. The standard establishes four calcite stone classifications (I, II, III, IV) based on physical characteristics and working properties. It recommends specific ASTM test methods for absorption, density, compressive strength, flexural strength, and abrasion resistance appropriate for natural calcitic stone.
While C503 addresses marble rather than limestone, specifiers sometimes reference it when working with ultra-white or highly calcitic limestone varieties that share marble’s physical behavior. The classification approach and recommended test battery provide useful models for structuring limestone procurement specifications, particularly for premium architectural paving projects.
The key value of C503 for limestone specifiers lies in its procurement framework. It demonstrates how to structure finish requirements, dimensional tolerances, and required test documentation for natural calcitic dimension stone. Specifiers can adapt C503’s testing recommendations to limestone projects while correctly citing C568 as the governing material standard.
Table: ASTM C503 Summary
| Clause Area | What It Covers | When It’s a Useful Parallel |
|---|---|---|
| Scope | Marble dimension stone (calcite and dolomite) for building construction | Provides model for structuring dimension stone procurement |
| Classification | Four calcite stone grades (I, II, III, IV) based on physical properties | Classification logic adaptable to limestone grading discussions |
| Physical properties | Recommended tests: absorption, density, flexural strength, compressive strength | Test battery applicable to limestone; specifiers should cite C568 but use similar test list |
| Finish requirements | Specifies finish categories and visual acceptance criteria | Finish specification language translates well to limestone paving |
| Sampling & testing | Sample size, specimen preparation, conditioning protocols | Testing protocols appropriate for natural calcitic stone including limestone |
| Dimensional tolerances | Sawn stone thickness and dimensional variation limits | Tolerance framework applicable across dimension stone families |
The correct standard for limestone pavers — ASTM C568 and related test methods
ASTM C568 is the dimension stone standard written specifically for limestone. It establishes three limestone classifications (Low Density, Medium Density, High Density) based on absorption and density ranges, providing a procurement framework that aligns with limestone’s natural variability. The standard addresses material characteristics, finish types, dimensional requirements, and recommended testing protocols.
C568 does not prescribe pass/fail thresholds for every application. Instead, it provides a classification system and directs specifiers to request appropriate ASTM test methods based on project requirements. This structure recognizes that limestone performance depends on density grade, finish type, installation method, and exposure conditions—variables the specifier must evaluate for each project.
Essential test methods dimension stone specifiers should request include ASTM C97 (absorption and bulk specific gravity), C99 (modulus of rupture for flexural strength), C170 (compressive strength), C241 (abrasion resistance of stone subjected to foot traffic), C880 (flexural strength using four-point loading), and C1353 (Taber abrasion where relevant for specific finishes). Specifiers should require that all test reports identify the limestone density classification, finish state during testing, specimen orientation, and conditioning protocol.
The relationship between C568 and test methods is critical: C568 provides the material specification and classification, while individual C-test methods (C97, C99, C241, etc.) provide standardized test protocols. Both the material standard (C568) and specific test results must appear in procurement documents to create enforceable specifications.
Table: Standards & Tests for Limestone Pavers
| Standard/Test Method | Purpose | What to Request from Supplier |
|---|---|---|
| ASTM C568 | Material specification and limestone classification (Low/Medium/High Density) | Technical data sheet stating C568 density classification and limestone variety |
| ASTM C97 | Absorption and bulk specific gravity | Lab report showing absorption percentage, bulk specific gravity, finish state, specimen conditioning |
| ASTM C99 | Modulus of rupture (flexural strength) | Lab report with load at failure, calculated modulus, specimen dimensions, orientation relative to bedding plane |
| ASTM C170 | Compressive strength | Lab report showing ultimate compressive load, specimen dimensions, calculated strength in psi or MPa |
| ASTM C241 | Abrasion resistance (foot traffic simulation) | Lab report showing volume loss or depth of wear after specified cycles, finish type tested |
| ASTM C880 | Flexural strength (four-point loading) | Lab report showing modulus of rupture, specimen geometry, support span configuration |
| ASTM C1353 | Taber abrasion (supplemental for certain finishes) | Lab report showing wear index, abrasive wheel type, cycles completed, finish state |
Verification note: Standards, test reports and performance claims should be verified by reviewing original ASTM documents, laboratory reports and Citadel Stone TDS. Consult licensed design professionals for project-specific code and installation decisions. This article is informational.
How to write a project specification for limestone pavers — copy-paste clauses
Effective limestone paver specifications reference ASTM C568, list required test methods explicitly, define finish and dimensional acceptance criteria, and establish clear procurement documentation requirements. The following specification snippets provide copy-paste language for RFPs, RFQs, and construction specifications.
Structure your specification in sections: material standard, required testing and documentation, finish requirements, dimensional tolerances, packaging and identification, and sample approval process. Each section should state exactly what documentation the supplier must provide and what constitutes acceptance criteria.
Critical specification elements include requiring original laboratory test reports (not summaries), mandating lot-specific identification tags visible on packaging, establishing retention sample protocols, and requiring photographic documentation of finishes in both dry and wet conditions. These provisions ensure traceability and provide objective acceptance criteria for inspectors.
Table: Specification Snippet Reference
| Clause Purpose | Copy-Paste Text |
|---|---|
| Material Standard | “Limestone pavers shall comply with ASTM C568 Standard Specification for Limestone Dimension Stone. Supplier shall provide technical data sheet stating density classification (Low, Medium, or High Density per C568) and geological variety.” |
| Required Test Reports | “Supplier shall provide original laboratory test reports for each production lot, minimum tests: ASTM C97 (absorption and bulk specific gravity), ASTM C99 (modulus of rupture), ASTM C241 (abrasion resistance). Reports shall include laboratory name, accreditation certificate (ISO/IEC 17025 or equivalent), test date, sample identification, specimen conditioning protocol, and finish state during testing.” |
| Finish Specification | “Specify finish type (e.g., thermally finished, honed, sawn, bush-hammered). Supplier shall provide color photographs showing finish in dry and wet conditions under diffuse natural light. Finish shall be consistent within each lot with variation documented photographically.” |
| Dimensional Tolerances | “Dimensional tolerances shall comply with ASTM C1528 Standard Specification for Dimension Stone Sawn Faces. Thickness variation: [specify tolerance, typically ±1/8 inch or ±3mm for calibrated pavers]. Length and width: [specify, typically ±1/8 inch]. Squareness and warp: per C1528 unless otherwise specified.” |
| Lot Identification | “Each pallet or bundle shall display weather-resistant tag showing: production lot number, quarry source, density classification per C568, finish type, nominal dimensions, quantity, and supplier contact. Lot numbers shall match laboratory test report sample identifications.” |
| Sample Approval | “Supplier shall provide sample set representing full range of color and finish variation prior to production release. Samples shall be minimum [specify size, typically 12×12 inches]. Sample approval does not waive requirement for production lot test reports.” |
| Retention Samples | “Retain one full paver unit from each production lot on site until final acceptance. Label with lot number matching test reports and installation location.” |
What test reports to demand from Citadel Stone — procurement checklist
A complete procurement package for limestone pavers includes technical data sheets, lot-specific laboratory test reports, photographic documentation, and traceability records. This section provides a copy-paste checklist for RFPs and supplier qualification reviews.
Required documentation from Citadel Stone or any dimension stone supplier includes: complete technical data sheet (TDS) stating ASTM C568 density classification and geological source; original laboratory reports for ASTM C97, C99, and C241 with all required fields completed; laboratory accreditation certificate confirming ISO/IEC 17025 or equivalent quality system; high-resolution photographs showing finish appearance in dry and wet conditions; production lot identification tags matching test report sample IDs; and finish tolerance control samples representing acceptable variation range.
Additional recommended documentation includes slip resistance test results per ASTM C1028 or equivalent method relevant to ADA compliance discussions (noting that slip resistance depends on finish, installation, and maintenance); installation guidelines specific to the limestone variety and finish; chemical resistance data if the paving will be exposed to deicing salts or acidic conditions; and freeze-thaw durability data for cold climate applications (ASTM C666 or documented field performance in similar exposure).
Table: Procurement Checklist for Limestone Pavers
| Item | Why It Matters | How to Verify |
|---|---|---|
| Technical Data Sheet (TDS) stating C568 density classification | Establishes material category and expected performance range | Verify TDS explicitly references C568 and states Low/Medium/High Density classification |
| ASTM C97 absorption and density report | Absorption affects freeze-thaw durability, staining susceptibility, and weight calculations | Confirm report shows lot ID matching pallet tags, finish state, conditioning method, lab name and accreditation |
| ASTM C99 modulus of rupture report | Flexural strength indicates load-bearing capacity and breakage resistance | Verify specimen orientation (perpendicular or parallel to bedding), dimensions, and calculated modulus value |
| ASTM C241 abrasion resistance report | Predicts surface wear under foot traffic | Check test cycles completed, finish type tested (must match project finish), volume or depth of wear measurement |
| Laboratory accreditation certificate | Ensures test methods performed correctly and results are defensible | Request current ISO/IEC 17025 certificate or equivalent; verify scope includes ASTM dimension stone test methods |
| Finish photographs (dry and wet) | Shows actual appearance including color variation and slip characteristics when wet | Require natural diffuse lighting, multiple units showing variation range, clearly labeled with lot number |
| Production lot tags | Enables traceability from test reports through installation | Photograph tags on pallets; verify lot numbers match all test reports and TDS sample identification |
| Retention samples | Provides physical reference for warranty claims and future replacement matching | Label and store securely on site; photograph with lot tag visible |
Verification note: Standards, test reports and performance claims should be verified by reviewing original ASTM documents, laboratory reports and Citadel Stone TDS. Consult licensed design professionals for project-specific code and installation decisions. This article is informational.
Interpreting test results — practical guidance for specifiers
Reading dimension stone laboratory reports requires understanding specimen preparation, test conditions, and reporting conventions. Misinterpreting test data or overlooking critical report fields can lead to acceptance of non-compliant material or rejection of acceptable lots.
Essential report elements include laboratory name and contact information, accreditation certificate reference (ISO/IEC 17025 scope statement), test method citation (e.g., “ASTM C97-22”), sample identification matching supplier lot tags, specimen conditioning protocol (oven-dried, saturated, or as-received), finish state during testing, specimen orientation relative to natural bedding plane, test date, and calculated results with units clearly stated.
Common red flags that should trigger follow-up questions include: lot numbers on test reports that don’t match pallet identification tags (indicates testing of different material); missing or expired laboratory accreditation (questions whether test methods were performed correctly); reports that omit specimen conditioning or finish state (absorption and strength vary significantly with moisture content and surface texture); test dates more than 12 months old for current production (stone properties can vary between quarry lifts); missing photographic documentation (prevents visual verification of what was tested); and reports showing only summary data without raw measurements or specimen identification (prevents verification and limits usefulness for troubleshooting).
When reviewing multiple test reports across different lots, look for consistency in performance values. Significant variations between lots may indicate blending of different quarry zones or changes in finishing equipment settings. Consistent results across lots suggest good production control.
Table: Laboratory Report Red Flags
| Red Flag | Why It Matters | What to Do |
|---|---|---|
| Lot ID mismatch between report and pallet tags | Material tested may not be material delivered | Reject shipment until supplier provides matching documentation |
| Missing laboratory accreditation certificate | Test methods may not have been performed correctly; results not defensible | Request current accreditation certificate showing ASTM dimension stone tests in scope |
| No specimen conditioning protocol stated | Absorption and strength values meaningless without knowing moisture state | Request clarification or retest with conditioning method specified |
| Test date older than 12 months | Stone properties vary by quarry zone and production period; old data may not represent current production | Request current production lot testing |
| Finish state not documented | Finish dramatically affects absorption, strength, and abrasion results | Require retest or clarification; finish must match project specification |
| Missing photographic evidence | Cannot verify what was tested or match appearance to delivered material | Request photographs of test specimens and production lot |
| Summary data only (no raw measurements) | Prevents verification of calculations and limits troubleshooting | Request complete report including specimen dimensions, loads, raw measurements |
| Specimen orientation not specified | Limestone properties vary significantly parallel vs. perpendicular to bedding | Request clarification; flexural testing should note orientation |
Installation & code interactions — what standards don’t cover
ASTM material specifications and test methods address stone properties and procurement requirements but do not provide installation instructions. Successful limestone paving depends on appropriate substrate preparation, drainage design, jointing systems, and installation techniques that vary by climate, loading conditions, and finish type.
ASTM C568 and related test methods tell you what the stone is; they do not tell you how to install it. Installation design requires coordination with geotechnical engineers (for substrate bearing capacity and drainage), structural engineers (for vehicular loading and point loads), and experienced stone installers familiar with the specific limestone variety and finish type.
Local building code compliance is mandatory and supersedes any ASTM material standard. Authority Having Jurisdiction (AHJ) requirements, state DOT standards for public paving, ADA accessibility requirements for slip resistance and transitions, and municipal stormwater management provisions all impose constraints on material selection and installation design. Consult licensed design professionals to integrate ASTM material specifications with applicable codes.
Installation coordination checklist: substrate bearing capacity and compaction verification (geotechnical engineer); drainage design including slope, subsurface drainage layer, and permeability requirements (civil engineer); jointing system selection (open joints, mortared, resin-bonded) based on movement potential and climate (installer and design professional); freeze-thaw detailing including joint spacing, drainage, and deicing salt exposure mitigation (design professional with local climate experience); edge restraint system appropriate for loading and substrate (installer); and finish maintenance protocol including sealing recommendations and cleaning method restrictions (supplier technical support).
Common specification mistakes & QA checklist
Use this quality assurance checklist before releasing procurement documents, reviewing supplier submittals, or accepting delivered material:
- Wrong ASTM standard referenced: Specification cites ASTM C936 (concrete pavers) instead of ASTM C568 (limestone dimension stone). This is the most common specification error and creates unenforceable procurement requirements.
- Missing C97 or C99 test reports: Specification requires C568 compliance but fails to list specific test methods (particularly C97 absorption and C99 flexural strength) that suppliers must provide. Generic “testing required” language is unenforceable.
- No lot-specific photo documentation required: Specification omits requirement for photographs showing finish and color variation. Without photos, acceptance disputes have no objective reference.
- Mock-up approval not tied to test reports: Specification requires sample approval but doesn’t require that approved samples match test report lot identification. This allows suppliers to show premium samples but deliver different material.
- Finish wet/dry appearance not documented: Specification describes finish in dry state only. Many limestone finishes darken or change appearance when wet; disputes arise when pavers are installed and first wetted.
- Laboratory accreditation not required: Specification accepts test reports without requiring laboratory ISO/IEC 17025 accreditation or equivalent. Non-accredited testing may not follow proper test methods.
- No retention sample protocol: Specification does not require retention samples labeled with lot numbers. Without physical samples, warranty claims and future replacement matching become extremely difficult.
- Dimensional tolerances not specified: Specification states “industry standard” tolerances without citing ASTM C1528 or providing numeric values. This guarantees disputes over acceptable thickness variation.
- Installation not separated from material specification: Specification mixes material properties (C568, test reports) with installation requirements (substrate, drainage). Keep material procurement specs and installation specs in separate sections with clear responsibility assignments.
- No requirement for sample-to-production matching: Specification approves samples but does not require that production material match approved sample range. Include language requiring production lots to fall within approved sample variation envelope.
Designer brief — specifying Citadel Stone white limestone pavers for regional US microclimates
White limestone can provide a light, refined finish for exterior paving when its physical characteristics are matched to local weather and use. The notes below are entirely hypothetical and intended to help design teams compare exposure, maintenance and loading considerations across a selection of US locations — they do not describe actual projects or named clients. The guidance uses the term white limestone pavers so specifiers can see typical wording for tender documents and sample requests.
Cheyenne, Wyoming
Cheyenne’s high plains climate features cold winters, frequent freeze–thaw cycles and strong winds that can carry abrasive dust; UV intensity is also higher at elevation. For Cheyenne we would recommend a dense, low-absorption white limestone pavers grade with demonstrated frost resistance and a honed or fine-textured finish to reduce slipperiness under mixed conditions. Typical thickness guidance would be 20–30 mm for patios and 30–40 mm for areas with occasional light vehicle access. The supplier could supply freeze-test data, finish samples, specification text for subbase drainage, and palletised delivery options.
Montgomery, Alabama
Montgomery’s humid subtropical climate brings hot, humid summers, frequent heavy rain and periodic tropical systems; biological growth and salt-borne coastal influence may be relevant in some corridors. In Montgomery we would advise choosing white limestone pavers with low porosity and a brushed or lightly textured finish to aid slip resistance in wet weather and to simplify cleaning; joint detailing should prioritise positive drainage. As a general guide, 20–30 mm suits pedestrian terraces and pool surrounds while 30–40 mm is suggested where light vehicles might access. The supplier could provide sample packs, maintenance notes, technical datasheets and palletised logistics information.
Baton Rouge, Louisiana
Baton Rouge experiences high humidity, strong summer storms and occasional hurricane-driven exposure; salt is a factor in nearby estuarine zones. For Baton Rouge we would typically specify low-porosity white limestone pavers with a cleft or textured finish for wet-traction performance and consider sealed or sacrificial joints in the most exposed locations. Thickness guidance would be 20–30 mm for pedestrian use and 30–40 mm for light vehicle areas as a rule of thumb. The supplier could offer coastal performance datasheets, matched sample swatches, specification support and palletised delivery planning.
Kansas City, Missouri
Kansas City has a continental climate with hot summers, cold winters and periodic severe storms; freeze–thaw cycles and de-icing salt use are important for long-term durability. For Kansas City we would favour white limestone pavers with low water absorption and a honed or sandblasted finish to reduce slip when damp and limit salt ingress; drainage and edge restraints should be specified carefully. Typical thickness recommendations: 20–30 mm for patios and pedestrian zones; 30–40 mm for occasional light vehicle loads. The supplier could provide technical datasheets, sample tiles for mock-ups, specification notes and palletised delivery options.
Tucson, Arizona
Tucson’s desert environment features intense solar radiation, very low humidity and large diurnal temperature swings; thermal movement and surface heat are primary concerns. In Tucson we would recommend dense, low-porosity white limestone pavers with a honed or lightly textured finish to reduce glare and moderate barefoot temperatures, combined with adequately sized movement joints. General thickness guidance remains 20–30 mm for pedestrian terraces and 30–40 mm for light vehicle areas. The supplier could supply UV-stability guidance, finish samples for heat-gain trials, technical datasheets and palletised shipping advice.
Rapid City, South Dakota
Rapid City’s location near the Black Hills brings seasonal snow, freeze–thaw exposure and occasional heavy rainfall; wind-driven grit can also influence surface wear. For Rapid City we would suggest white limestone pavers selected for low absorption and frost resistance, finished in a textured or honed face to improve traction in variable weather. As a guideline, 20–30 mm is appropriate for pedestrian areas and 30–40 mm for light vehicle routes. The supplier could provide freeze-thaw test data, sample pieces for on-site review, specification guidance for subbase drainage and palletised delivery proposals.
FAQs — short practical answers
Q: Can I use ASTM C936 as a substitute for dimension stone specifications when specifying natural limestone pavers?
A: No. C936 covers concrete interlocking pavers (manufactured concrete products) and is not applicable to natural quarried limestone. Reference ASTM C568 for limestone dimension stone and request C568-compliant technical data and test reports from your supplier.
Q: Do I need ASTM C97 absorption testing for every production lot, or can I rely on generic data sheets?
A: Request lot-specific C97 testing. Limestone absorption varies by quarry zone, bedding plane orientation, and finish type. Lot-specific reports with matching identification tags provide the only defensible documentation that the material delivered matches tested performance.
Q: Is ASTM C503 useful for limestone paver projects, or should I ignore it?
A: C503 addresses marble, not limestone. However, C503’s classification system and testing framework provide useful models for structuring limestone specifications, particularly for high-grade calcitic limestone. Always cite C568 as the governing standard for limestone while using C503’s procurement logic as a reference.
Q: What’s the difference between ASTM C568 and the test methods like C97 or C99?
A: C568 is the material specification that defines limestone categories and procurement requirements. C97, C99, C241, and similar test methods are standardized laboratory procedures for measuring specific properties. Your specification should reference C568 as the material standard and list which test methods (C97, C99, etc.) suppliers must perform.
Q: Should I require slip resistance testing for limestone pavers under ASTM or ADA standards?
A: Slip resistance depends on finish type, surface moisture, contaminants, and footwear. ASTM C1028 provides one test method; ADA references accessible routes without prescribing a specific test. Consult with design professionals and legal counsel regarding slip resistance requirements for your project’s specific use and jurisdiction.
Q: If my supplier provides test reports that are 18 months old, is that acceptable?
A: Older test data may not represent current production, especially if quarrying has moved to different zones or finishing equipment has changed. Request current production lot testing dated within the last 12 months, with lot identification matching delivered material pallet tags.
Conclusion & Citadel Stone CTA
Specifying limestone pavers correctly begins with referencing the right ASTM standard—C568 for limestone dimension stone, not C936 (concrete) or C503 (marble). Pair the material standard with explicit test method requirements (C97, C99, C241) and demand complete documentation including laboratory accreditation, lot-specific reports, and photographic evidence.
Request complete technical documentation from Citadel Stone including C568-compliant technical data sheets, ASTM-referenced laboratory test reports for your project’s production lots, finish photographs in dry and wet conditions, and guidance on specification language for your project requirements. Schedule a mock-up to verify finish, color range, and dimensional consistency before full production.
Verification note: Standards, test reports and performance claims should be verified by reviewing original ASTM documents, laboratory reports and Citadel Stone TDS. Consult licensed design professionals for project-specific code and installation decisions. This article is informational.
