---
title: "1 Inch Pultruded Fiberglass Grating: I-Bar Specs & Loads"
description: "1 inch pultruded fiberglass grating with I-bars: the three catalog types at 40%, 50% and 60% open, their weights, deflection by span, resins and how to order."
url: https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-inch/
markdown: https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-inch.md
published: 2026-10-16
updated: 2026-10-17
---

[Home](https://www.strongrate.us/) › [Fiberglass grating](https://www.strongrate.us/fiberglass-grating/) › [Pultruded grating](https://www.strongrate.us/pultruded-fiberglass-grating/) › [1" I-bar](https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-inch/)

# 1" I-Bar Pultruded Fiberglass Grating

_Updated Oct 17, 2026_

Strongrate's catalog lists three 1" (25 mm) I-bar pultruded grating types: I-4010, I-5010 and I-6010, at 40%, 50% and 60% open area and 2.3–3.5 lb/ft² (11.2–17.1 kg/m²). Pick the open area for the walking surface, then check deflection at your clear span in the load tables below.

**Specifications: 1" (25 mm) I-bar pultruded grating**

| Specification | Value | Note |
| --- | --- | --- |
| Profile | Pultruded I-bars joined by cross bars bonded with epoxy |  |
| Bar depth | 1" (25 mm) | Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings. |
| Catalog types | I-4010, I-5010, I-6010 | Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings. |
| Open area | 40%, 50% and 60% | Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings. |
| Weight | 2.3–3.5 lb/ft² (11.2–17.1 kg/m²) | Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings. |
| Cross-bar centers | 6" (152 mm) | Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings. |
| Glass content | 60–65% |  |
| Resins | Fire-retardant vinyl ester (VEFR), isophthalic polyester (IFR) or food-grade isophthalic (FG) | Maximum service temperatures as printed in the catalog’s resin table; its chemical-resistance chart prints lower maximums. |
| Surfaces | Corrugated (slotted), gritted or smooth top; solid cover with checker or grit finish |  |
| Maximum panel size | 5 ft × 20 ft (1524 × 6100 mm) | Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings. |
| Standard panel sizes | On request |  |
| Bar dimensions and clear opening | On request |  |
| Colors | On request |  |
| Tolerances | On request |  |

_Diagram: 1" I-bar pultruded grating: I-shaped bearing bars joined by a cross bar, in section and plan. Schematic — not to scale._

## Which 1" I-bar types does Strongrate list?

The three types differ in bearing-bar spacing: closer bars mean smaller openings and more weight. Panels run up to 5 ft × 20 ft (1524 × 6100 mm), with the bearing bars along the panel length, so plan panel length with the span direction.

**Strongrate 1" (25 mm) I-bar pultruded grating types: catalog data**

| Type | Bar shape | Depth | Bearing-bar centers | Cross-bar centers | Open area | Weight |
| --- | --- | --- | --- | --- | ---: | ---: |
| 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] |

_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).

## How much load can 1 inch pultruded fiberglass grating carry?

Find your clear span, then read deflection under your design load. Typical pedestrian loads are 50–65 psf (2.4–3.1 kPa); halve tabulated loads for impact or dynamic conditions. How to read the columns: [fiberglass grating load tables](https://www.strongrate.us/resources/fiberglass-grating-load-tables/).

**Concentrated line load deflection, Strongrate 1" (25 mm) I-bar types (catalog page 72)**

| Clear span | Type | 202 lb/ft (300 kg/m) | 302 lb/ft (450 kg/m) | 504 lb/ft (750 kg/m) | 1,008 lb/ft (1,500 kg/m) | 2,016 lb/ft (3,000 kg/m) | 3,998 lb/ft (5,950 kg/m) | Max load, lb/ft (kg/m) |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| 17-3/4" (450 mm) | I-4010 | — | — | 0.04" (1.02 mm) | 0.08" (2.03 mm) | 0.16" (4.06 mm) | 0.30" (7.62 mm) | 11,150 (16,593) |
| 23-5/8" (600 mm) | I-4010 | — | — | 0.10" (2.54 mm) | 0.18" (4.57 mm) | 0.35" (8.89 mm) | 0.69" (17.53 mm) | 8,708 (12,959) |
| 35-7/16" (900 mm) | I-4010 | 0.11" (2.8 mm) | 0.16" (4.06 mm) | 0.26" (6.6 mm) | 0.53" (13.46 mm) | 1.06" (26.9 mm) | 2.12" (53.85 mm) | 5,805 (8,639) |
| 47-1/4" (1200 mm) | I-4010 | 0.23" (5.84 mm) | 0.35" (8.89 mm) | 0.58" (14.73 mm) | 1.16" (29.46 mm) | 2.33" (59.2 mm) | 4.65" (118.1 mm) | 4,314 (6,420) |
| 17-3/4" (450 mm) | I-5010 | — | — | 0.04" (1.02 mm) | 0.08" (2.03 mm) | 0.16" (4.06 mm) | 0.30" (7.62 mm) | 9,279 (13,808) |
| 23-5/8" (600 mm) | I-5010 | — | — | 0.10" (2.54 mm) | 0.19" (4.85 mm) | 0.37" (9.4 mm) | 0.74" (18.8 mm) | 7,257 (10,799) |
| 35-7/16" (900 mm) | I-5010 | 0.10" (2.54 mm) | 0.16" (4.06 mm) | 0.27" (6.86 mm) | 0.53" (13.46 mm) | 1.07" (27.2 mm) | 2.13" (54.1 mm) | 4,834 (7,194) |
| 47-1/4" (1200 mm) | I-5010 | 0.29" (7.37 mm) | 0.43" (10.9 mm) | 0.72" (18.28 mm) | 1.44" (36.58 mm) | 2.88" (73.2 mm) | 5.75" (146 mm) | 3,603 (5,362) |
| 17-3/4" (450 mm) | I-6010 | — | — | 0.06" (1.52 mm) | 0.10" (2.54 mm) | 0.19" (4.83 mm) | 0.38" (9.65 mm) | 7,437 (11,067) |
| 23-5/8" (600 mm) | I-6010 | — | — | 0.12" (3.05 mm) | 0.22" (5.59 mm) | 0.44" (11.2 mm) | 0.87" (22.1 mm) | 5,805 (8,639) |
| 35-7/16" (900 mm) | I-6010 | 0.13" (3.3 mm) | 0.19" (4.83 mm) | 0.31" (7.87 mm) | 0.62" (15.75 mm) | 1.24" (31.5 mm) | 2.48" (62.99 mm) | 3,864 (5,750) |
| 47-1/4" (1200 mm) | I-6010 | 0.31" (7.87 mm) | 0.46" (11.7 mm) | 0.76" (19.3 mm) | 1.52" (38.61 mm) | 3.05" (77.5 mm) | 6.09" (154.6 mm) | 2,873 (4,275) |

_Cells are deflection under static load at ambient temperature, as printed in Strongrate’s 2023 catalog (mm), with inches converted; “—” means no value is printed. Halve the loads for impact or dynamic conditions. Confirm the values for your span in the submittal before final design._

Notes:

- Deflections as printed in the factory catalog (2023), static loads at ambient temperature.
- Catalog tables.

**Uniform load deflection, Strongrate I-4010 and I-5010 (catalog page 73)**

| Clear span | Type | 205 psf (1,000 kg/m²) | 389 psf (1,900 kg/m²) | 799 psf (3,900 kg/m²) | 1,434 psf (7,000 kg/m²) | 1,946 psf (9,500 kg/m²) | 3,994 psf (19,500 kg/m²) | Max load, psf (kg/m²) |
| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: |
| 17-3/4" (450 mm) | I-4010 | 0.05" (1.25 mm) | 0.03" (0.76 mm) | 0.05" (1.27 mm) | 0.09" (2.29 mm) | 0.12" (3.05 mm) | 0.24" (6.1 mm) | 14,813 (72,325) |
| 23-5/8" (600 mm) | I-4010 | 0.04" (1.01 mm) | 0.05" (1.27 mm) | 0.14" (3.56 mm) | 0.27" (6.86 mm) | 0.35" (8.89 mm) | — | 8,708 (42,515) |
| 35-7/16" (900 mm) | I-4010 | 0.18" (4.57 mm) | 0.33" (8.38 mm) | 0.64" (16.26 mm) | — | — | — | 3,863 (18,863) |
| 47-1/4" (1200 mm) | I-4010 | 0.57" (14.48 mm) | — | — | — | — | — | 2,152 (10,507) |
| 17-3/4" (450 mm) | I-5010 | 0.02" (0.51 mm) | 0.03" (0.76 mm) | 0.05" (1.27 mm) | 0.10" (2.54 mm) | 0.13" (3.302 mm) | 0.26" (6.6 mm) | 12,391 (60,499) |
| 23-5/8" (600 mm) | I-5010 | 0.05" (1.27 mm) | 0.09" (2.29 mm) | 0.16" (4.06 mm) | 0.20" (5.08 mm) | 0.29" (7.26 mm) | 0.60" (15.24 mm) | 7,256 (35,429) |
| 35-7/16" (900 mm) | I-5010 | 0.19" (4.83 mm) | 0.35" (8.89 mm) | 0.68" (17.27 mm) | — | — | — | 3,203 (15,638) |
| 47-1/4" (1200 mm) | I-5010 | 0.65" (16.51 mm) | — | — | — | — | — | 1,802 (8,796) |

_Cells are deflection under static load at ambient temperature, as printed in Strongrate’s 2023 catalog (mm), with inches converted; “—” means no value is printed. Halve the loads for impact or dynamic conditions. Confirm the values for your span in the submittal before final design._

Notes:

- Deflections as printed in the factory catalog (2023), static loads at ambient temperature.
- Catalog tables.

If 1" misses your load or deflection limit, step up to [1-1/2" I-bar grating](https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-5-inch/) or [2" T-bar grating](https://www.strongrate.us/pultruded-fiberglass-grating/t-bar-2-inch/). Pultruded grating is marketed as about twice as stiff as molded, so also compare [1" molded grating](https://www.strongrate.us/molded-fiberglass-grating/1-inch-square-mesh/) at the same span.

## Which resins and surfaces can you order at 1"?

Fire-retardant vinyl ester (VEFR, up to 230°F (110°C)), isophthalic polyester (IFR, up to 176°F (80°C)) or food-grade isophthalic polyester (FG). Tops are corrugated, gritted or smooth, with solid covers in checker or grit finish. Resins are compared on [pultruded fiberglass grating](https://www.strongrate.us/pultruded-fiberglass-grating/).

## How do you order 1" I-bar grating?

Made in Nantong, China, and shipped from China. Full containers and project quantities are quoted factory-direct; orders under about 500 sq ft, or needed in under 3 weeks, are referred to US stock. See the [fiberglass grating price per square foot](https://www.strongrate.us/pricing/fiberglass-grating-price/) basis or [request a quote](https://www.strongrate.us/request-quote/).

## Frequently asked questions

### How far apart are the cross rods on 1" I-bar panels?

Strongrate's catalog lists cross bars at 6" (152 mm) centers on all three 1" types. US stock pultruded panels commonly use 6" (152 mm) too, and some lines use 3" (76 mm) or 8" (203 mm).

### Which way should the bars run on a 1" I-bar walkway?

On an accessible route, ADA 302.3 requires openings that do not pass a 1/2" (13 mm) sphere, with the long side of elongated openings perpendicular to the dominant direction of travel. The clear opening decides it, not the open-area percentage; for small openings see [mini mesh ADA grating](https://www.strongrate.us/molded-fiberglass-grating/mini-mesh-ada/).

## Related pages
- [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.
- [1-1/2" pultruded I-bar grating](https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-5-inch/): The three 1-1/2-inch I-bar pultruded grating types in Strongrate’s catalog (I-4015, I-5015, I-6015) with open area, weight and catalog deflection tables, plus the ASTM E84 results of DNV-listed I 6015.
- [2" T-bar fiberglass grating](https://www.strongrate.us/pultruded-fiberglass-grating/t-bar-2-inch/): The two 2-inch T-bar pultruded grating types in Strongrate’s catalog (T-3320, T-5020) with open area, weight, catalog deflection tables and resins, plus the ASTM E84 results of DNV-listed T5020.
- [1" molded fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/1-inch-square-mesh/): Specifications, ASTM E84 results, panel sizes and catalog load tables for Strongrate 1-inch-deep molded fiberglass grating with a 1-1/2-inch square mesh (DNV-listed model 38×38×25 mm), and how to order it.
- [Fiberglass grating clips](https://www.strongrate.us/accessories/fiberglass-grating-clips/): Hold-down clips for molded and pultruded fiberglass grating: the STRONGFIX types in Strongrate’s catalog, common US clip types, the Type 316 stainless and 4 ft spacing rules in US guide specifications, and how to order clips with grating.
- [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 type (I-4010, I-5010 or I-6010), clear span, design load, deflection limit, resin, panel size, quantity and 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 industrial pultruded load tables (PDF)](https://www.fibergrate.com/media/181609/industrial-pultruded-load-tables.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.