| Material Performance | Compressive strength | Granite is a high-strength natural stone. The specified compressive-strength value should be taken from the test report for the exact quarry source, grade, and finished product rather than assumed from the stone name alone. | Use the tested value together with the design safety factor, contact area, eccentric loading, and the supporting substrate capacity. |
| Material Performance | Water absorption | Water absorption varies by granite type and processing. Lower absorption generally supports better resistance to moisture-related staining and freeze-thaw exposure, but it does not eliminate the need for correct drainage and detailing. | Request a lot-specific test result when blocks will be used outdoors, in wet environments, or in climates with repeated freezing and thawing. |
| Material Performance | Dimensional stability | Granite has low moisture movement compared with many porous construction materials. Dimensional tolerances still depend on the cutting, grinding, and inspection method. | Define length, width, height, squareness, flatness, edge condition, and allowable tolerance before production. |
| International Standards | ASTM C615 | ASTM C615 covers granite dimension stone and addresses requirements such as physical properties, workmanship, finish, and sampling. It should be referenced only where the project specification adopts ASTM requirements. | Confirm the required edition and whether the project requires additional structural, slip-resistance, chemical-resistance, or freeze-thaw testing. |
| International Standards | ASTM C97, ASTM C170, and ASTM C880 | ASTM C97 is used for absorption and bulk specific gravity; ASTM C170 addresses compressive strength; ASTM C880 addresses flexural strength of dimension stone. These tests measure different properties and are not interchangeable. | Match each test to the actual load case. A compressive-strength result alone does not verify resistance to bending, impact, or point loading. |
| International Standards | European specification route | EN 1341 addresses natural stone paving slabs and may be relevant to paving applications. Other European applications can require different product standards, national annexes, or project-specific testing. | Ask the engineer or authority having jurisdiction to identify the applicable harmonized or national standard before ordering. |
| Design & Safety | Load-bearing area | Design capacity depends on the actual bearing area, load distribution, block geometry, surface flatness, edge distance, and the strength of adjacent materials. | Avoid relying on nominal block size alone. Provide calculations for concentrated loads, uneven contact, and potential edge breakout. |
| Design & Safety | Outdoor and freeze-thaw exposure | Granite selection for freezing climates should consider water absorption, freeze-thaw test requirements, drainage, joint design, and exposure severity. | Do not seal trapped water inside the assembly. Confirm that the selected test method and acceptance criteria match the climate and installation detail. |
| Fabrication | Typical custom dimensions | Support blocks are commonly produced to project-specific dimensions. Practical sizes may range from small pieces around 100 × 100 × 50 mm to larger engineered pieces exceeding 300 mm in one dimension, depending on load and handling requirements. | Finalize shop drawings before cutting. Larger blocks increase mass, handling requirements, packaging needs, and freight cost. |
| Fabrication | Surface finish | Available finishes may include sawn, honed, flamed, or polished surfaces. The finish affects friction, appearance, cleanability, and contact behavior. | Specify the finish separately for visible faces and bearing faces. Bearing faces generally require controlled flatness rather than decorative polishing. |
| Quality Control | Inspection documents | A project quality package may include dimensional inspection records, material identification, photographs, packing lists, test reports, and a certificate of conformity when required. | Agree on inspection points, sampling frequency, rejection criteria, and document language before production begins. |
| Packaging | Export wooden packaging | Wooden crates, skids, and pallets used in international trade commonly need to comply with ISPM 15 treatment and marking requirements. The requirement applies to qualifying wood packaging material, not to the granite itself. | Use suitable treated wood, maintain visible marks, protect finished surfaces, and verify destination-country customs rules before dispatch. |
| Shipping | Weight and volume planning | Granite density is commonly planned at approximately 2,600–2,800 kg/m³ for preliminary logistics calculations. The certified or measured density of the selected material should control final calculations. | Calculate net stone weight, crate weight, total gross weight, package dimensions, center of gravity, and lifting points before booking transport. |
| Shipping | Container utilization | Granite is often weight-limited before it is volume-limited. Actual allowable cargo weight depends on the container specification, carrier rules, route, road regulations, and terminal restrictions. | Request a carrier-approved packing plan. Do not use a generic container payload figure for final shipment approval. |
| Shipping | Handling and securing | Stone blocks should be immobilized against sliding, impact, tipping, and abrasion. Blocking, bracing, cushioning, and lifting equipment must be suitable for the calculated mass. | Provide handling instructions and package marks showing gross weight, lifting orientation, center of gravity where relevant, and fragile finished surfaces. |
| Trade & Customs | Product classification | Natural stone classification can depend on whether the item is crude, roughly trimmed, cut, sawn, or further worked. The correct customs code must be confirmed for the exact product form and destination. | Use accurate commercial descriptions, material type, dimensions, quantity, net weight, gross weight, origin, and customs classification on shipping documents. |
| Trade & Customs | Incoterms and insurance | Incoterms define selected delivery responsibilities, costs, and risk transfer, but they do not replace a freight contract, cargo insurance policy, or technical acceptance specification. | State the agreed Incoterms rule and named place, clarify unloading responsibility, and confirm insurance coverage for breakage and concealed damage. |
| Installation | Substrate compatibility | Granite should bear on a clean, stable, and adequately strong substrate. Mortar, bedding compounds, isolation layers, and drainage details must be compatible with the design loads and exposure conditions. | Check differential movement, chemical compatibility, moisture paths, tolerances, and access for replacement or future maintenance. |
| Project Management | Lead time and approvals | Custom quarry selection, sample approval, testing, fabrication, export packing, port handling, and international transit can each affect the delivery schedule. | Allow time for technical submittals, first-article approval, independent inspection, customs clearance, and potential port or weather delays. |
| Sustainability | Service life and maintenance | Granite can provide long service life when correctly selected and detailed. Routine maintenance generally focuses on cleaning, drainage, joint condition, and inspection for cracking or movement. | Evaluate whole-life performance rather than purchase price alone, including replacement access, transport distance, packaging, and end-of-life reuse potential. |
