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Field guide for landscape contractors installing random polygonal limestone flagstones (`Tianlu`, `Guyu`) with tight, balanced organic joints.
Dry-fit large anchor pieces first (3–5 pieces/m²), maintain consistent 15–25mm joint widths, back-butter 100% with white C2S1 adhesive, and pre-seal the top surface before grouting to speed up cleanup.
Field guide for landscape contractors installing random polygonal limestone flagstones (`Tianlu`, `Guyu`) with tight, balanced organic joints. When specifying natural limestone for high-value residential villas, hospitality resorts, or commercial facades, decisions must be anchored in laboratory-verified petrographic and mechanical data rather than generic trade assumptions.
| Benchmark Parameter | Verified Factory & Laboratory Standard | Reference Module |
|---|---|---|
| Petrographic Class | ASTM C568 Category III High-Density Limestone (2,650 kg/m³) | Module 04 |
| Water Absorption & Frost | 0.85% – 1.80% (ASTM C97) · 100 Cycles Passed / F100 (ASTM C666 / GOST 30629) | Module 06 |
| Calibration & Pre-Shipment QC | ±1.0mm CNC Calibration + 3,000 m² Dry-Lay Hall Photo Approval | Module 02 |
| 20GP Container Utilization | 20mm: ~500 m² | 30mm: ~320 m² | 50mm: ~190 m² (27 MT Payload) | Module 05 |
