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Documentation - Molded Grating - .75x4xh1-standard

0.75 × 4 × H 1" (19 × 100 × H 25 mm) Standard

Product Overview

This 1-inch-deep molded FRP grating uses a rectangular 0.75-inch × 4-inch mesh configuration with load-bearing bars positioned at relatively close intervals. The elongated openings provide a high percentage of open area for drainage, airflow, and light transmission while maintaining a lightweight, corrosion-resistant panel.

The directional mesh configuration is suited to applications in which the primary span direction is known and the supporting structure can be aligned with the grating’s load-bearing bars. Common uses include industrial walkways, equipment platforms, drainage covers, maintenance access areas, screening, ventilation panels, wastewater facilities, marine environments, chemical-processing locations, and docks.

Dimensional Drawings

Imperial dimensional drawing for 0.75 by 4 inch mesh by 1 inch deep molded FRP standard grating
Figure 9: Imperial Units
Metric dimensional drawing for 19 by 100 millimeter mesh by 25 millimeter deep molded FRP standard grating
Figure 10: Metric Units

Product Specifications

Style Standard
Top Open Area 59%
Measurement Metric Imperial
Mesh Length 19 mm 0.75 in
Mesh Width 100 mm 4.0 in
Mesh Thickness 25 mm 1.0 in
Bar Thickness at Top 7 mm 0.25 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 14.65 kg/m2 3.0 lb/ft2

Load Tables

Uniform Load — Deflection in Inches

Clear Span
(in)		 50
lb/ft2 		70
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 0.03 0.05 2,822 14,110
18 0.01 0.01 0.02 0.03 0.05 0.07 0.09 0.18 0.37 1,250 6,250
24 0.02 0.03 0.05 0.07 0.09 0.15 0.28 — — 706 3,530
30 0.06 0.09 0.13 0.19 0.28 0.41 — — — 458 2,290
36 0.14 0.18 0.29 0.41 — — — — — 322 1,610
42 0.25 0.36 — — — — — — — 226 1,130
48 0.45 — — — — — — — — 166 830

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 0.01 0.02 0.05 0.10 1,422 7,110
18 0.01 0.01 0.03 0.05 0.10 0.18 0.39 941 4,705
24 0.02 0.04 0.08 0.13 0.21 0.45 — 714 3,570
30 0.05 0.08 0.17 0.24 0.45 — — 568 2,840
36 0.07 0.15 0.28 0.45 — — — 482 2,410
42 0.10 0.22 — — — — — 418 2,090
48 0.16 0.35 — — — — — 378 1,890

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

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