| 1 | Raw Material Traceability | 15% | Material grade, steel or aluminum substrate, nominal thickness, coating type, coil identification, and batch traceability should be documented for every production order. | Mill test certificates, incoming inspection records, coil labels, purchase specifications, and random thickness testing. | Traceable raw materials reduce variation between batches and make quality claims easier to verify. |
| 2 | Substrate and Coating Performance | 15% | Verify nominal metal thickness, metallic coating mass, paint system, color consistency, adhesion, hardness, and resistance to corrosion and weathering. | Independent laboratory reports, coating-thickness measurements, cross-cut adhesion tests, salt-spray results, and accelerated weathering results. | The substrate and coating system largely determine service life, appearance retention, and resistance to moisture. |
| 3 | Dimensional Accuracy and Profile Consistency | 12% | Consistent panel length, width, effective coverage, overlap geometry, hole position, edge detail, and profile height within approved tolerances. | Approved technical drawings, first-article inspection reports, calibrated measuring tools, and sampling records from finished goods. | Accurate profiles improve installation speed, roof alignment, water shedding, and interchangeability during maintenance. |
| 4 | Manufacturing Process Control | 12% | Controlled roll forming, cutting, pressing, coating, granule application where applicable, packaging, and final inspection processes. | Process flow charts, control plans, inspection checkpoints, equipment maintenance logs, calibration certificates, and nonconformance reports. | Documented process control helps prevent profile distortion, coating damage, burrs, scratches, and inconsistent finished products. |
| 5 | Quality Management System | 10% | A documented quality management system with clear responsibilities, corrective-action procedures, internal audits, and customer complaint handling. | ISO 9001:2015 certificate where applicable, audit reports, quality manuals, corrective-action records, and product inspection plans. | A functioning quality system is more meaningful than a certificate alone because it demonstrates repeatable management of quality risks. |
| 6 | Product Testing and Compliance | 10% | Testing should address dimensions, mechanical properties, coating adhesion, corrosion resistance, water penetration, wind performance, and fire-related requirements when relevant to the project. | Product test reports, third-party laboratory credentials, applicable national or international standards, and project-specific compliance documentation. | Testing confirms whether the product is suitable for the intended climate, roof design, building code, and installation method. |
| 7 | Production Capacity and Lead Time | 8% | Evaluate verified monthly capacity, number of production lines, standard and custom-product lead times, peak-season capacity, and delivery reliability. | Production schedules, capacity statements, shipment records, order performance data, and an on-site or virtual factory audit. | Adequate capacity and predictable delivery reduce construction delays and the risk of mixed or rushed production batches. |
| 8 | Export Packaging and Logistics | 6% | Packaging should protect panels from abrasion, bending, moisture, edge damage, and shifting during inland transport and ocean freight. | Packaging specifications, loading photographs, container-loading procedures, moisture protection measures, and damage-claim records. | Proper packaging preserves factory quality until the materials reach the job site. |
| 9 | Technical Support and Customization | 6% | Ability to provide shop drawings, installation guidance, accessory compatibility, color or profile development, sample approval, and project-specific documentation. | Technical data sheets, installation manuals, CAD files, sample-development records, response-time records, and engineering support contacts. | Technical support helps ensure that the selected shingle system works with the roof assembly and local installation practices. |
| 10 | Total Cost of Ownership and After-Sales Service | 6% | Compare product price, accessories, freight, duties, installation requirements, expected maintenance, warranty terms, claim response, and replacement-part availability. | Itemized quotations, warranty documents, commercial terms, reference-project feedback, complaint-resolution records, and lifecycle-cost calculations. | The lowest purchase price may not provide the lowest installed or lifecycle cost. |
