| Depth | Weight | Span | Use |
|---|---|---|---|
| 150 mm (6") | ~220 kg/m² | ≤6 m | Mezzanines, corridors |
| 200 mm (8") | ~280 kg/m² | ≤9 m | Classrooms, offices |
| 250 mm (10") | ~340 kg/m² | ≤11 m | Sanctuaries |
| 305 mm (12") | ~400 kg/m² | ≤14 m | Long-span sanctuaries |
| 355 mm (14") | ~460 kg/m² | ≤16 m | Heavy / very long span |
Standard width: 1220 mm (4'). Prestressing strands: 12.7 mm (1/2") dia.
| Support Type | Min. | Recommended |
|---|---|---|
| CMU / grouted masonry | 65 mm | 75–90 mm |
| Cast-in-place concrete beam | 75 mm | 90–100 mm |
| Steel beam (bearing plate) | 50 mm | 75 mm |
| Precast beam / inverted tee | 75 mm | 90 mm |
| Parameter | Requirement |
|---|---|
| Grout type | Non-shrink cementitious, 30 MPa min. |
| Keyway gap | 15–25 mm between slabs |
| Placement temp. | 10°C–30°C |
| Pre-wet surfaces | SSD (saturated surface dry) |
| Cure time | Min. 24 hrs moist cure |
| Core fill depth | 300–600 mm at bearing ends |
Rod every metre of keyway. Dam perimeter ends with foam backer rod before grouting.
| Item | Value |
|---|---|
| Typical thickness | ~25 mm |
| Walkable | 4–6 hours |
| Ready for flooring | 24–48 hours |
| Gauge pin spacing | 1200–1500 mm centres |
| Temp. range | 10°C–30°C |