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Documentation - Molded Grating - 1x4xh1-standard

1 × 4 × H 1" (25 × 100 × H 25 mm) Standard

Product Overview

This 1-inch-deep molded FRP grating uses a directional 1-inch × 4-inch rectangular mesh. Its 67% open area provides efficient drainage, airflow, and light transmission while reducing panel weight. The directional load-bar configuration is designed for applications where the principal span direction and support orientation are established.

Common applications include industrial walkways, equipment platforms, maintenance access areas, drainage and trench covers, ventilation panels, wastewater and water-treatment facilities, marine structures, chemical-processing plants, and other corrosive environments where a lightweight, open, nonconductive walking surface is required.

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Dimensional Drawings

Imperial dimensional drawing for 1 by 4 inch mesh by 1 inch deep molded FRP standard grating
Figure 21: Imperial Units
Metric dimensional drawing for 25 by 100 millimeter mesh by 25 millimeter deep molded FRP standard grating
Figure 22: Metric Units

Product Specifications

Style Standard
Top Open Area 67%
Measurement Metric Imperial
Mesh Length 25 mm 1.0 in
Mesh Width 100 mm 4.0 in
Mesh Thickness 25 mm 1.0 in
Bar Thickness at Top 7 mm 0.28 in
Bar Thickness at Bottom 5 mm 0.20 in
Maximum Panel Width 1220 mm 48 in
Maximum Panel Length 3660 mm 144 in
Weight 12.21 kg/m2 2.5 lb/ft2

Load Tables

Uniform Load — Deflection in Inches

Clear Span
(in)		 50
lb/ft2 		65
lb/ft2 		100
lb/ft2 		150
lb/ft2 		200
lb/ft2 		300
lb/ft2 		500
lb/ft2 		1,000
lb/ft2 		2,000
lb/ft2 		Maximum Recommended Load
(lb/ft2)		 Ultimate Load
(lb/ft2)
12 <0.01 <0.01 <0.01 <0.01 <0.01 0.01 0.02 0.05 0.09 2,127 10,635
18 0.01 0.01 0.02 0.03 0.04 0.07 0.11 0.21 0.44 982 4,910
24 0.04 0.05 0.07 0.11 0.15 0.22 0.37 — — 540 2,698
30 0.08 0.11 0.18 0.27 0.33 — — — — 331 1,656
36 0.15 0.21 0.31 0.47 — — — — — 230 1,148
42 0.35 0.43 — — — — — — — 176 878
46 0.49 — — — — — — — — 150 752

Line Load — Deflection in Inches

Clear Span
(in)		 50
lb/ft		 100
lb/ft		 200
lb/ft		 300
lb/ft		 500
lb/ft		 1,000
lb/ft		 2,000
lb/ft		 Maximum Recommended Load
(lb/ft)		 Ultimate Load
(lb/ft)
12 <0.01 <0.01 0.01 0.02 0.02 0.04 0.08 1,048 5,239
18 0.01 0.02 0.05 0.07 0.12 0.24 — 688 3,441
24 0.03 0.06 0.13 0.17 0.30 — — 533 2,666
30 0.05 0.11 0.22 0.32 — — — 439 2,195
36 0.09 0.18 0.35 — — — — 356 1,780
42 0.15 0.29 — — — — — 306 1,528
46 0.20 0.38 — — — — — 291 1,457

Note: See Appendix A — Load Table Notes for assumptions, limitations, safety factors, and interpretation guidance.

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