---
title: "Fiberglass Grating Sizes, Weight & Open Area Chart"
description: "Fiberglass grating sizes chart: common panel sizes and depths, weight per sq ft (lb/ft² and kg/m²) and open area by mesh, with Strongrate’s catalog size tables."
url: https://www.strongrate.us/resources/fiberglass-grating-sizes-weight-and-open-area/
markdown: https://www.strongrate.us/resources/fiberglass-grating-sizes-weight-and-open-area.md
published: 2026-10-16
updated: 2026-10-17
---

[Home](https://www.strongrate.us/) › [Resources](https://www.strongrate.us/resources/) › [Sizes, weight & open area](https://www.strongrate.us/resources/fiberglass-grating-sizes-weight-and-open-area/)

# Fiberglass Grating Sizes, Weight and Open Area

_Updated Oct 17, 2026_

Strongrate's catalog lists 1-1/2" × 1-1/2" (38 × 38 mm) square-mesh molded grating in 4 ft × 12 ft (1220 × 3660 mm), 4 ft × 8 ft (1220 × 2440 mm) and two other panel sizes. At 1-1/2" (38 mm) deep it weighs 4.0 lb/ft² (19.5 kg/m²) with 68% open area. Every mesh, depth and pultruded type is in the tables below.

## What sizes, weights and open areas does Strongrate’s catalog list?

For each molded mesh and depth the catalog gives bar width, weight, open area and standard panel sizes; for each pultruded type, depth, bar spacing, open area and weight. Values are inch-first with the catalog's millimeters.

### Molded grating, square mesh

**Strongrate molded grating, square mesh: catalog sizes, weight and open area**

| Mesh | Depth | Bar width (as printed) | Weight | Open area | Standard panel sizes |
| --- | --- | --- | ---: | ---: | --- |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 1/2" (13 mm) [note 1] | 1/4" / 3/16" (6.0 / 5.0 mm) [note 1] | 1.2 lb/ft² (6.1 kg/m²) [note 1] | 78% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 5/8" (15 mm) [note 1] | 1/4" / 3/16" (6.0 / 5.0 mm) [note 1] | 1.5 lb/ft² (7.1 kg/m²) [note 1] | 78% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 3/4" (20 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 2.0 lb/ft² (9.6 kg/m²) [note 1] | 68% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 1" (25 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 2.5 lb/ft² (12.3 kg/m²) [note 1] | 68% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 3.0 lb/ft² (14.6 kg/m²) [note 1] | 68% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 4.0 lb/ft² (19.5 kg/m²) [note 1] | 68% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 4.2 lb/ft² (20.6 kg/m²) [note 1] | 68% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 2" (50 mm) heavy duty [note 1] | 3/8" / 5/16" (9.5 / 7.5 mm) [note 1] | 8.2 lb/ft² (40.0 kg/m²) [note 1] | 56% [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 2-3/8" (60 mm) heavy duty [note 1] | 3/8" / 5/16" (10.5 / 8.5 mm) [note 1] | 9.8 lb/ft² (48.0 kg/m²) [note 1] | 54% [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 1-1/2" (38 × 38 mm) [note 1] | 2-9/16" (65 mm) heavy duty [note 1] | 7/16" / 3/8" (11.0 / 9.0 mm) [note 1] | 10.7 lb/ft² (52.0 kg/m²) [note 1] | 52% [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-9/16" × 1-9/16" (40 × 40 mm) [note 1] | 1" (25 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 2.5 lb/ft² (12.3 kg/m²) [note 1] | 67% [note 1] | 3.3 ft × 9.87 ft (1007 × 3007 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 4.09 ft × 12.1 ft (1247 × 3687 mm); 5 ft × 13.28 ft (1527 × 4047 mm) [note 1] |
| 1-9/16" × 1-9/16" (40 × 40 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.0 lb/ft² (14.5 kg/m²) [note 1] | 67% [note 1] | 3.3 ft × 9.87 ft (1007 × 3007 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 4.09 ft × 12.1 ft (1247 × 3687 mm); 5 ft × 13.28 ft (1527 × 4047 mm) [note 1] |
| 1-9/16" × 1-9/16" (40 × 40 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.9 lb/ft² (19.2 kg/m²) [note 1] | 67% [note 1] | 3.3 ft × 9.87 ft (1007 × 3007 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.17 ft × 9.73 ft (967 × 2967 mm); 5 ft × 13.28 ft (1527 × 4047 mm) [note 1] |
| 2" × 2" (51 × 51 mm) [note 1] | 1/2" (13 mm) [note 1] | 1/4" / 3/16" (6.0 / 5.0 mm) [note 1] | 1.2 lb/ft² (5.8 kg/m²) [note 1] | 82% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 2" × 2" (51 × 51 mm) [note 1] | 5/8" (15 mm) [note 1] | 1/4" / 1/4" (7.0 / 6.0 mm) [note 1] | 1.4 lb/ft² (6.8 kg/m²) [note 1] | 82% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 2" × 2" (51 × 51 mm) [note 1] | 1" (25 mm) [note 1] | 5/16" / 1/4" (7.5 / 6.0 mm) [note 1] | 2.4 lb/ft² (11.8 kg/m²) [note 1] | 78% [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm) [note 1] |
| 2" × 2" (51 × 51 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.6 lb/ft² (17.8 kg/m²) [note 1] | 78% [note 1] | 5.87 ft × 14.87 ft (1788 × 4531 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 2" × 2" (51 × 51 mm) [note 1] | 2" (50 mm) [note 1] | 5/16" / 3/16" (7.5 / 5.0 mm) [note 1] | 4.4 lb/ft² (21.5 kg/m²) [note 1] | 78% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 2" × 2" (51 × 51 mm) [note 1] | 2" (50 mm) [note 1] | 5/16" / 1/4" (8.0 / 6.0 mm) [note 1] | 4.8 lb/ft² (23.5 kg/m²) [note 1] | 78% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 3-1/4" × 3-1/4" (83 × 83 mm) [note 1] | 1" (25 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 1.2 lb/ft² (6.1 kg/m²) [note 1] | 84% [note 1] | 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.85 ft × 13.15 ft (1173 × 4007 mm) [note 1] |
| 3-1/4" × 3-1/4" (83 × 83 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 2.0 lb/ft² (9.6 kg/m²) [note 1] | 84% [note 1] | 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.85 ft × 13.15 ft (1173 × 4007 mm) [note 1] |

_As printed in Strongrate’s 2023 product catalog; confirmed in your quote and submittal drawings. The catalog prints two bar widths per depth without saying which is the top and which the bottom of the bar._

Notes:

1. Values as printed in the factory catalog (2023).

Rows marked heavy duty are the catalog's thicker-bar versions, at 8.2–10.7 lb/ft² (40.0–52.0 kg/m²). Product pages: [1" molded grating](https://www.strongrate.us/molded-fiberglass-grating/1-inch-square-mesh/), [1-1/2" molded grating](https://www.strongrate.us/molded-fiberglass-grating/1-5-inch-square-mesh/) and [2" molded grating](https://www.strongrate.us/molded-fiberglass-grating/2-inch-square-mesh/).

### Molded grating, rectangular mesh

**Strongrate molded grating, rectangular mesh: catalog sizes, weight and open area**

| Mesh | Depth | Bar width (as printed) | Weight | Open area | Span direction | Standard panel sizes |
| --- | --- | --- | ---: | ---: | --- | --- |
| 1" × 3-15/16" (25 × 100 mm) [note 1] | 1" (25 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 2.7 lb/ft² (13.0 kg/m²) [note 1] | 67% [note 1] | Panel width [note 1] | 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 1" × 3-15/16" (25 × 100 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.2 lb/ft² (15.6 kg/m²) [note 1] | 67% [note 1] | Panel width [note 1] | 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 1" × 4" (25 × 102 mm) [note 1] | 1" (25 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 2.7 lb/ft² (13.0 kg/m²) [note 1] | 67% [note 1] | Width or length [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1" × 4" (25 × 102 mm) [note 1] | 1" (25 mm) heavy duty [note 1] | 3/8" / 5/16" (9.5 / 8.0 mm) [note 1] | 3.2 lb/ft² (15.6 kg/m²) [note 1] | 67% [note 1] | Panel width [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 4" (38 × 102 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 5/16" / 1/4" (8.0 / 6.0 mm) [note 1] | 2.7 lb/ft² (13.0 kg/m²) [note 1] | 65% [note 1] | Panel length [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1" × 6" (25 × 152 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 3/8" / 1/4" (9.0 / 6.5 mm) [note 1] | 4.6 lb/ft² (22.5 kg/m²) [note 1] | 63% [note 1] | Panel length [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1-1/2" × 6" (38 × 152 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 5/16" / 1/4" (8.0 / 6.0 mm) [note 1] | 3.3 lb/ft² (15.9 kg/m²) [note 1] | 67% [note 1] | Panel length [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1" × 2" (25 × 51 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 7/16" / 3/8" (11.0 / 9.0 mm) [note 1] | 6.3 lb/ft² (30.7 kg/m²) [note 1] | 49% [note 1] | Width or length [note 1] | 4 ft × 6 ft (1220 × 1830 mm); 4 ft × 12 ft (1220 × 3660 mm) [note 1] |
| 1" × 2" (25 × 51 mm) [note 1] | 2" (50 mm) [note 1] | 1/2" / 3/8" (12.0 / 9.0 mm) [note 1] | 8.6 lb/ft² (41.8 kg/m²) [note 1] | 48% [note 1] | Width or length [note 1] | 4 ft × 6 ft (1220 × 1830 mm); 4 ft × 12 ft (1220 × 3660 mm) [note 1] |
| 2-3/8" × 3-15/16" (60 × 100 mm) [note 1] | 1-1/8" (28 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 1.5 lb/ft² (7.2 kg/m²) [note 1] | 78% [note 1] | Panel length [note 1] | 4.92 ft × 13.12 ft (1500 × 4000 mm); 4.92 ft × 6.56 ft (1500 × 2000 mm) [note 1] |
| 2-3/8" × 8-5/8" (60 × 220 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (6.3 / 5.0 mm) [note 1] | 1.8 lb/ft² (8.8 kg/m²) [note 1] | 67% [note 1] | Panel length [note 1] | 5.87 ft × 14.69 ft (1788 × 4476 mm); 5.87 ft × 7.34 ft (1788 × 2238 mm) [note 1] |
| 1" × 4" (25 × 102 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 5/8" / 3/16" (15.0 / 5.0 mm) [note 1] | 4.3 lb/ft² (21.0 kg/m²) [note 1] | 62% [note 1] | Panel length [note 1] | 4 ft × 12 ft (1220 × 3660 mm) [note 1] |
| 1-1/2" × 4" (38 × 102 mm) [note 1] | 2" (50 mm) [note 1] | 5/16" / 3/16" (8.0 / 5.0 mm) [note 1] | 3.1 lb/ft² (15.3 kg/m²) [note 1] | 68% [note 1] | Panel length [note 1] | 4 ft × 12 ft (1220 × 3660 mm) [note 1] |

_As printed in Strongrate’s 2023 product catalog; confirmed in your quote and submittal drawings. The catalog prints two bar widths per depth without saying which is the top and which the bottom of the bar._

Notes:

1. Values as printed in the factory catalog (2023).

The span direction column is the catalog’s load-bearing direction: lay the panel so that edge spans between supports. The last two rows are a separate construction with wide top bars. See [rectangular mesh fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/1x4-rectangular-mesh/).

### Molded grating, mini mesh

**Strongrate mini-mesh molded grating: catalog sizes, weight and open area**

| Mesh | Depth | Bar width (as printed) | Weight | Open area | Standard panel sizes |
| --- | --- | --- | ---: | ---: | --- |
| 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm) [note 1] | 1" (25 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 3.4 lb/ft² (16.8 kg/m²) [note 1] | 30% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 3.8 lb/ft² (18.5 kg/m²) [note 1] | 30% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 4.8 lb/ft² (23.5 kg/m²) [note 1] | 30% [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1" × 1" openings on 2" × 2" centers (25 × 25 / 51 × 51 mm) [note 1] | 5/8" (15 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 1.5 lb/ft² (7.5 kg/m²) [note 1] | 55% [note 1] | 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 1" × 1" openings on 2" × 2" centers (25 × 25 / 51 × 51 mm) [note 1] | 2" (50 mm) [note 1] | 5/16" / 1/4" (8.0 / 6.0 mm) [note 1] | 5.8 lb/ft² (28.5 kg/m²) [note 1] | 55% [note 1] | 5 ft × 13.12 ft (1524 × 4000 mm); 4 ft × 12 ft (1220 × 3660 mm); 4 ft × 8 ft (1220 × 2440 mm); 3 ft × 10 ft (921 × 3050 mm) [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 9/16" (14 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 2.2 lb/ft² (10.5 kg/m²) [note 1] | 42% [note 1] | 4.09 ft × 13.28 ft (1247 × 4047 mm); 4.09 ft × 12.1 ft (1247 × 3687 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 7/8" (22 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.0 lb/ft² (14.5 kg/m²) [note 1] | 42% [note 1] | 5 ft × 13.28 ft (1527 × 4047 mm); 4.09 ft × 12.1 ft (1247 × 3687 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.7 lb/ft² (18.0 kg/m²) [note 1] | 42% [note 1] | 5 ft × 13.28 ft (1527 × 4047 mm); 4.09 ft × 12.1 ft (1247 × 3687 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 4.8 lb/ft² (23.5 kg/m²) [note 1] | 42% [note 1] | 5 ft × 13.28 ft (1527 × 4047 mm); 4.09 ft × 12.1 ft (1247 × 3687 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 3/4" × 3/4" openings on 1-9/16" × 1-9/16" centers (20 × 20 / 40 × 40 mm) [note 1] | 2-3/8" (60 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 7.9 lb/ft² (38.5 kg/m²) [note 1] | 42% [note 1] | 3.3 ft × 9.87 ft (1007 × 3007 mm); 3.3 ft × 6.58 ft (1007 × 2007 mm) [note 1] |
| 1" × 1" openings on 2-1/16" × 2-1/16" centers (26 × 26 / 52 × 52 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 3.2 lb/ft² (15.5 kg/m²) [note 1] | 60% [note 1] | 5 ft × 13.29 ft (1532 × 4050 mm) [note 1] |
| 1" × 1" openings on 2-1/16" × 2-1/16" centers (26 × 26 / 52 × 52 mm) [note 1] | 1-1/2" (38 mm) [note 1] | 1/4" / 3/16" (6.5 / 5.0 mm) [note 1] | 4.0 lb/ft² (19.5 kg/m²) [note 1] | 60% [note 1] | 3.95 ft × 13.16 ft (1205 × 4011 mm) [note 1] |
| 1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm) [note 1] | 7/8" (22 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.1 lb/ft² (15.0 kg/m²) [note 1] | 30% [note 1] | 5 ft × 13.28 ft (1527 × 4047 mm); 4.09 ft × 13.28 ft (1247 × 4047 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm) [note 1] | 1-3/16" (30 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 3.9 lb/ft² (19.0 kg/m²) [note 1] | 30% [note 1] | 5 ft × 13.28 ft (1527 × 4047 mm); 4.09 ft × 13.28 ft (1247 × 4047 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |
| 1/2" × 1/2" openings on 1-9/16" × 1-9/16" centers (13 × 13 / 40 × 40 mm) [note 1] | 1-9/16" (40 mm) [note 1] | 1/4" / 3/16" (7.0 / 5.0 mm) [note 1] | 5.1 lb/ft² (25.0 kg/m²) [note 1] | 30% [note 1] | 5 ft × 13.28 ft (1527 × 4047 mm); 4.09 ft × 13.28 ft (1247 × 4047 mm); 3.3 ft × 13.15 ft (1007 × 4007 mm); 3.3 ft × 9.87 ft (1007 × 3007 mm) [note 1] |

_As printed in Strongrate’s 2023 product catalog; confirmed in your quote and submittal drawings. The catalog prints two bar widths per depth without saying which is the top and which the bottom of the bar._

Notes:

1. Values as printed in the factory catalog (2023).

On accessible routes, ADA 302.3 requires openings that a 1/2" (13 mm) sphere cannot pass, with elongated openings perpendicular to the dominant direction of travel; the opening at the walking surface decides it. See [mini-mesh ADA fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/mini-mesh-ada/).

### Pultruded grating

**Strongrate pultruded grating types: catalog depth, bar spacing, open area and weight**

| Type | Bar shape | Depth | Bearing-bar centers | Cross-bar centers | Open area | Weight |
| --- | --- | --- | --- | --- | ---: | ---: |
| T-1210 [note 1] | T-bar | 1" (25 mm) [note 1] | 1.71" (43.4 mm) [note 1] | 6" (152 mm) [note 1] | 12% [note 1] | 3.0 lb/ft² (14.5 kg/m²) [note 1] |
| T-1810 [note 1] | T-bar | 1" (25 mm) [note 1] | 2.00" (50.8 mm) [note 1] | 6" (152 mm) [note 1] | 18% [note 1] | 2.8 lb/ft² (13.8 kg/m²) [note 1] |
| T-2510 [note 1] | T-bar | 1" (25 mm) [note 1] | 2.00" (50.8 mm) [note 1] | 6" (152 mm) [note 1] | 25% [note 1] | 2.8 lb/ft² (13.6 kg/m²) [note 1] |
| T-3310 [note 1] | T-bar | 1" (25 mm) [note 1] | 2.40" (61.0 mm) [note 1] | 6" (152 mm) [note 1] | 33% [note 1] | 2.3 lb/ft² (11.2 kg/m²) [note 1] |
| T-3810 [note 1] | T-bar | 1" (25 mm) [note 1] | 2.40" (61.0 mm) [note 1] | 6" (152 mm) [note 1] | 38% [note 1] | 2.1 lb/ft² (10.2 kg/m²) [note 1] |
| T-1215 [note 1] | T-bar | 1-1/2" (38 mm) [note 1] | 1.70" (43.3 mm) [note 1] | 6" (152 mm) [note 1] | 12% [note 1] | 4.0 lb/ft² (19.6 kg/m²) [note 1] |
| T-2515 [note 1] | T-bar | 1-1/2" (38 mm) [note 1] | 2.00" (50.8 mm) [note 1] | 6" (152 mm) [note 1] | 25% [note 1] | 3.4 lb/ft² (16.7 kg/m²) [note 1] |
| T-3815 [note 1] | T-bar | 1-1/2" (38 mm) [note 1] | 2.40" (61.0 mm) [note 1] | 6" (152 mm) [note 1] | 38% [note 1] | 2.9 lb/ft² (14.2 kg/m²) [note 1] |
| I-4010 [note 1] | I-bar | 1" (25 mm) [note 1] | 1.00" (25.4 mm) [note 1] | 6" (152 mm) [note 1] | 40% [note 1] | 3.5 lb/ft² (17.1 kg/m²) [note 1] |
| I-5010 [note 1] | I-bar | 1" (25 mm) [note 1] | 1.18" (30.0 mm) [note 1] | 6" (152 mm) [note 1] | 50% [note 1] | 2.9 lb/ft² (14.2 kg/m²) [note 1] |
| I-6010 [note 1] | I-bar | 1" (25 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 60% [note 1] | 2.3 lb/ft² (11.2 kg/m²) [note 1] |
| I-40125 [note 1] | I-bar | 1-3/16" (30 mm) [note 1] | 1.00" (25.4 mm) [note 1] | 6" (152 mm) [note 1] | 40% [note 1] | 4.1 lb/ft² (19.8 kg/m²) [note 1] |
| I-50125 [note 1] | I-bar | 1-3/16" (30 mm) [note 1] | 1.20" (30.5 mm) [note 1] | 6" (152 mm) [note 1] | 50% [note 1] | 3.6 lb/ft² (17.4 kg/m²) [note 1] |
| I-60125 [note 1] | I-bar | 1-3/16" (30 mm) [note 1] | 1.46" (37.1 mm) [note 1] | 6" (152 mm) [note 1] | 60% [note 1] | 2.8 lb/ft² (13.5 kg/m²) [note 1] |
| I-4015 [note 1] | I-bar | 1-1/2" (38 mm) [note 1] | 1.00" (25.4 mm) [note 1] | 6" (152 mm) [note 1] | 40% [note 1] | 4.5 lb/ft² (22.0 kg/m²) [note 1] |
| I-5015 [note 1] | I-bar | 1-1/2" (38 mm) [note 1] | 1.20" (30.5 mm) [note 1] | 6" (152 mm) [note 1] | 50% [note 1] | 3.9 lb/ft² (19.1 kg/m²) [note 1] |
| I-6015 [note 1] | I-bar | 1-1/2" (38 mm) [note 1] | 1.46" (37.1 mm) [note 1] | 6" (152 mm) [note 1] | 60% [note 1] | 3.3 lb/ft² (16.1 kg/m²) [note 1] |
| T-3320 [note 1] | T-bar | 2" (50 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 33% [note 1] | 4.2 lb/ft² (20.3 kg/m²) [note 1] |
| T-5020 [note 1] | T-bar | 2" (50 mm) [note 1] | 2.00" (50.8 mm) [note 1] | 6" (152 mm) [note 1] | 50% [note 1] | 3.2 lb/ft² (15.7 kg/m²) [note 1] |
| HI-4710 [note 1] | I-bar, high load | 1" (25 mm) [note 1] | 1.19" (30.2 mm) [note 1] | 6" (152 mm) [note 1] | 47% [note 1] | 5.7 lb/ft² (27.6 kg/m²) [note 1] |
| HI-4715 [note 1] | I-bar, high load | 1-1/2" (38 mm) [note 1] | 1.19" (30.2 mm) [note 1] | 6" (152 mm) [note 1] | 47% [note 1] | 8.2 lb/ft² (40.0 kg/m²) [note 1] |
| HI-4720 [note 1] | I-bar, high load | 2" (50 mm) [note 1] | 1.19" (30.2 mm) [note 1] | 6" (152 mm) [note 1] | 47% [note 1] | 11.2 lb/ft² (54.5 kg/m²) [note 1] |
| HI-4725 [note 1] | I-bar, high load | 2-1/2" (64 mm) [note 1] | 1.19" (30.2 mm) [note 1] | 6" (152 mm) [note 1] | 47% [note 1] | 12.6 lb/ft² (61.6 kg/m²) [note 1] |
| HI-4730 [note 1] | I-bar, high load | 3" (76 mm) [note 1] | 1.19" (30.2 mm) [note 1] | 6" (152 mm) [note 1] | 47% [note 1] | 15.1 lb/ft² (73.6 kg/m²) [note 1] |
| HI-5810 [note 1] | I-bar, high load | 1" (25 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 58% [note 1] | 4.3 lb/ft² (21.0 kg/m²) [note 1] |
| HI-5815 [note 1] | I-bar, high load | 1-1/2" (38 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 58% [note 1] | 6.5 lb/ft² (31.8 kg/m²) [note 1] |
| HI-5820 [note 1] | I-bar, high load | 2" (50 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 58% [note 1] | 8.7 lb/ft² (42.5 kg/m²) [note 1] |
| HI-5825 [note 1] | I-bar, high load | 2-1/2" (64 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 58% [note 1] | 10.0 lb/ft² (48.9 kg/m²) [note 1] |
| HI-5830 [note 1] | I-bar, high load | 3" (76 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 58% [note 1] | 12.0 lb/ft² (58.6 kg/m²) [note 1] |
| HL-4020 [note 1] | I-bar, high load | 2" (50 mm) [note 1] | 1.00" (25.4 mm) [note 1] | 6" (152 mm) [note 1] | 40% [note 1] | 14.4 lb/ft² (70.4 kg/m²) [note 1] |
| HL-5020 [note 1] | I-bar, high load | 2" (50 mm) [note 1] | 1.18" (30.0 mm) [note 1] | 6" (152 mm) [note 1] | 50% [note 1] | 10.7 lb/ft² (52.2 kg/m²) [note 1] |
| HL-6020 [note 1] | I-bar, high load | 2" (50 mm) [note 1] | 1.50" (38.1 mm) [note 1] | 6" (152 mm) [note 1] | 60% [note 1] | 8.9 lb/ft² (43.5 kg/m²) [note 1] |
| SI-7310 [note 1] | I-bar, standard | 1" (25 mm) [note 1] | 1.19" (30.2 mm) [note 1] | 6" (152 mm) [note 1] | 73% [note 1] | 2.7 lb/ft² (13.2 kg/m²) [note 1] |
| SI-7315 [note 1] | I-bar, standard | 1-1/2" (38 mm) [note 1] | 1.19" (30.2 mm) [note 1] | 6" (152 mm) [note 1] | 73% [note 1] | 3.8 lb/ft² (18.6 kg/m²) [note 1] |
| SI-8310 [note 1] | I-bar, standard | 1" (25 mm) [note 1] | 1.87" (47.6 mm) [note 1] | 6" (152 mm) [note 1] | 83% [note 1] | 1.7 lb/ft² (8.5 kg/m²) [note 1] |
| SI-8315 [note 1] | I-bar, standard | 1-1/2" (38 mm) [note 1] | 1.87" (47.6 mm) [note 1] | 6" (152 mm) [note 1] | 83% [note 1] | 2.5 lb/ft² (12.0 kg/m²) [note 1] |

_As printed in Strongrate’s 2023 product catalog; confirmed in your quote and submittal drawings. Weights and open areas are from the catalog’s summary table; some of its detail cards print different values._

Notes:

1. Values as printed in the factory catalog (2023).

Pultruded panels run up to 5 ft × 20 ft (1524 × 6100 mm), with the bearing bars along the panel length. Product pages: [1" I-bar grating](https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-inch/), [1-1/2" I-bar grating](https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-5-inch/) and [2" T-bar grating](https://www.strongrate.us/pultruded-fiberglass-grating/t-bar-2-inch/).

## Which fiberglass grating sizes are standard in the US?

Molded grating is cast as one-piece panels in standard sizes; pultruded panels are assembled from bars, so their widths and lengths vary more. The last column shows where Strongrate's catalog lists a matching size.

**Common fiberglass grating panel sizes in the US, and the matching Strongrate catalog size**

| Panel size | Metric size, mm | Grating type | Area, sq ft (m²) | Strongrate catalog |
| --- | --- | --- | ---: | --- |
| 3' × 10' | 915 × 3050 [note 1] | Molded | 30 sq ft (2.8 m²) | Listed as 921 × 3050 mm for 8 meshes, including 1-1/2" × 1-1/2" (38 × 38 mm) [note 2] |
| 4' × 8' | 1220 × 2440 [note 1] | Molded | 32 sq ft (3.0 m²) | Listed as 1220 × 2440 mm for 4 meshes, including 1-1/2" × 1-1/2" (38 × 38 mm) [note 2] |
| 4' × 12' | 1220 × 3660 [note 1] | Molded | 48 sq ft (4.5 m²) | Listed as 1220 × 3660 mm for 11 meshes, including 1-1/2" × 1-1/2" (38 × 38 mm) [note 2] |
| 5' × 10' | 1525 × 3050 [note 1] | Molded | 50 sq ft (4.6 m²) | Not listed in the catalog |
| 4' × 6' | 1220 × 1830 [note 1] | Heavy-duty molded | 24 sq ft (2.2 m²) | Listed as 1220 × 1830 mm for 1" × 2" (25 × 51 mm) [note 2] |
| Pultruded: 3, 4 or 5 ft wide; up to 20 ft long, some to 24 ft | 915, 1220 or 1525 wide; up to 6095 long, some to 7315 [note 1] | Pultruded I-bar and T-bar | — | Maximum panel 5 ft × 20 ft (1524 × 6100 mm) [note 2] |

_Metric sizes are the trade nominals, rounded to the nearest 5 mm. Panels can be cut to fit; see [how to cut fiberglass grating](https://www.strongrate.us/resources/how-to-cut-fiberglass-grating/). Hold-down clips per panel are covered on [fiberglass grating clips](https://www.strongrate.us/accessories/fiberglass-grating-clips/)._

Notes:

1. Industry norms; Strongrate sizes are stated in your quote.
2. Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings.

## How much does fiberglass grating weigh per square foot?

Weight follows depth, mesh and construction: Strongrate's catalog lists 2.5 lb/ft² (12.3 kg/m²) at 1" (25 mm) and 4.0 lb/ft² (19.5 kg/m²) at 1-1/2" (38 mm) deep for 1-1/2" × 1-1/2" (38 × 38 mm) square mesh. US makers publish about 2.5–4.5 lb/ft² (12.2–22.0 kg/m²) for 1" (25 mm) to 2" (51 mm) molded grating.

For a full panel, multiply weight per area by panel area (areas are in the size table above). With the catalog's 4.0 lb/ft² (19.5 kg/m²) for 1-1/2" (38 mm) deep 1-1/2" × 1-1/2" (38 × 38 mm) square mesh, the 4 ft × 12 ft (1220 × 3660 mm) panel works out to about 192 lb (87.1 kg).

## What is the open area of fiberglass grating?

Open area is the percentage of the panel surface that is open, set mainly by mesh or bar spacing. Strongrate's catalog lists 68% for its 1-1/2" (38 mm) deep 1-1/2" × 1-1/2" (38 × 38 mm) square mesh and 30% for its 1-1/2" (38 mm) deep mini mesh with 3/4" × 3/4" openings on 1-1/2" × 1-1/2" centers (19 × 19 / 38 × 38 mm); the open area of every mesh and type is in the tables above. Load capacity by span is on [fiberglass grating load tables](https://www.strongrate.us/resources/fiberglass-grating-load-tables/).

To price a size, [request a quote](https://www.strongrate.us/request-quote/) with the panel size and quantity; the price basis is on [fiberglass grating price per square foot](https://www.strongrate.us/pricing/fiberglass-grating-price/).

## Frequently asked questions

### How much does a 4' × 8' fiberglass grating panel weigh?

A 4 ft × 8 ft (1220 × 2440 mm) panel is 32 sq ft (3.0 m²). From Strongrate's catalog weights, its 4 ft × 8 ft (1220 × 2440 mm) panel of 1-1/2" × 1-1/2" (38 × 38 mm) square mesh works out to about 81 lb (36.7 kg) at 1" (25 mm) deep and 128 lb (58.1 kg) at 1-1/2" (38 mm).

### Is Strongrate grating made in metric or inch sizes?

Strongrate's catalog gives every size in millimeters. Many molded panels are close to US foot sizes, such as 4 ft × 12 ft (1220 × 3660 mm), while others are metric, such as 3.3 ft × 9.87 ft (1007 × 3007 mm) for the 1-9/16" × 1-9/16" (40 × 40 mm) mesh. This site shows the inch nominal first and the catalog's millimeters in parentheses.

### What does heavy-duty molded fiberglass grating weigh?

Strongrate's catalog lists heavy-duty 1-1/2" × 1-1/2" (38 × 38 mm) square mesh at 2" (50 mm) to 2-9/16" (65 mm) deep, weighing 8.2–10.7 lb/ft² (40.0–52.0 kg/m²).

## Related pages
- [Fiberglass grating technical resources](https://www.strongrate.us/resources/): Index of fiberglass grating technical resources (load tables, sizes and weights, specifications, fire ratings, how-to guides, comparisons) and the standards they cite.
- [Fiberglass grating load tables](https://www.strongrate.us/resources/fiberglass-grating-load-tables/): The load tables in Strongrate’s catalog for each product, and how to read fiberglass grating load tables: uniform and line loads by span, deflection limits and safety factors.
- [Fiberglass grating specifications](https://www.strongrate.us/resources/fiberglass-grating-specifications/): An editable three-part CSI MasterFormat 06 74 13 guide specification for molded and pultruded fiberglass grating, with specifier’s notes, origin and warranty options, Strongrate catalog material data and a compliance table.
- [Molded fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/): Molded fiberglass (FRP) grating from Strongrate’s Nantong factory by depth and mesh: square, rectangular and mini meshes, the four DNV-listed models with their ASTM E84 results, panel sizes, resins, surfaces and how to get factory pricing.
- [Pultruded fiberglass grating](https://www.strongrate.us/pultruded-fiberglass-grating/): Strongrate pultruded fiberglass (FRP) grating: the 36 I-bar and T-bar types in the factory catalog with depth, open area and weight, the two DNV-listed models and their ASTM E84 results, resins, surfaces and how to order.
- [Fiberglass grating price per sq ft](https://www.strongrate.us/pricing/fiberglass-grating-price/): Fiberglass grating prices per square foot and per panel: dated US market benchmarks, what moves the price, and how Strongrate quotes factory-direct prices per project.

**Request a quote:** https://www.strongrate.us/request-quote/ · Order a sample: https://www.strongrate.us/samples/ — Send the panel sizes, depth, mesh and quantity you need, with your ZIP code. Quotes within 1 business day (US Central time).

## Sources
- Strongrate product catalog “Your Best FRP Solution” (image PDF, Sep 2023), supplied by the site owner (accessed Oct 17, 2026)
- [Fibergrate molded FRP products brochure; McNichols molded catalog](https://www.fibergrate.com/media/166803/molded-frp-products-brochure.pdf) (accessed Oct 15, 2026)
- [Grating Pacific, Molded Fiberglass Grating Sizes (PDF)](https://gratingpacific.com/wp-content/uploads/2019/09/Molded-Fiberglass-Grating-Sizes.pdf) (accessed Oct 15, 2026)
- [Grating Pacific Pultruded Sizes and Options (PDF); McNichols MS-I-6010; Bedford catalog](https://gratingpacific.com/wp-content/uploads/2019/10/Pultruded-Sizes-Options.pdf) (accessed Oct 15, 2026)
- [U.S. Access Board, Guide to the ADA Standards, Chapter 3: Floor and Ground Surfaces](https://www.access-board.gov/ada/guides/chapter-3-floor-and-ground-surfaces/) (accessed Oct 15, 2026)

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Fiberglass (FRP) grating made by NANTONG STRONGRATE CO.,LTD in Nantong, China. Products ship from China. Made in Nantong, China · Ships from China · HTS 3925.90.