The tables below present uniformly distributed load capacities and corresponding midspan deflections for molded FRP grating panels at various thicknesses and support spans. The values are drawn from full-scale panel load tests conducted in accordance with standard industry practice. The listed loads represent the total uniform load at which midspan deflection reaches span/180 under gradual application — the serviceability limit commonly used for pedestrian and light maintenance traffic. Panel failure loads typically exceed the tabulated values by a factor of at least 2.5, but the governing design condition is almost always deflection, not strength.
Uniform Load Capacities — Molded FRP Grating (1.0 m × panel width)
| Grating Thickness (mm / in) |
Support Span (mm) |
Uniform Load at L/180 (kN/m²) |
Uniform Load at L/180 (psf) |
Midspan Deflection at Load (mm) |
|---|---|---|---|---|
| 25 (1.0) | 600 | 12.2 | 255 | 3.3 |
| 25 (1.0) | 900 | 5.7 | 119 | 5.0 |
| 25 (1.0) | 1200 | 3.1 | 65 | 6.7 |
| 38 (1.5) | 600 | 20.4 | 426 | 3.3 |
| 38 (1.5) | 900 | 9.8 | 205 | 5.0 |
| 38 (1.5) | 1200 | 5.4 | 113 | 6.7 |
| 38 (1.5) | 1500 | 3.3 | 69 | 8.3 |
| 50 (2.0) | 900 | 16.3 | 340 | 5.0 |
| 50 (2.0) | 1200 | 9.2 | 192 | 6.7 |
| 50 (2.0) | 1500 | 5.8 | 121 | 8.3 |
Notes: Tabulated values assume simple supports and uniformly distributed load over a continuous panel width. Values are valid for open-mesh molded grating with 38 mm × 38 mm mesh configuration and grit-top surface. For concentrated loads or edge-bearing conditions, consult manufacturer-specific panel data. All values include a long-term deflection increment factor of 1.2 to account for creep under sustained load in humid environments.
Source: Advanced FRP Systems Engineering Data. Free to cite with link. Last verified: 2026-05-15.
For product-specific load tables and resin options, see Molded FRP Grating.