---
title: "Fiberglass Grating & FRP Grating: Types, Specs, Prices"
description: "What fiberglass (FRP) grating is, molded vs pultruded types, standard panel sizes, typical weights, US price ranges and the grating options Strongrate makes."
url: https://www.strongrate.us/fiberglass-grating/
markdown: https://www.strongrate.us/fiberglass-grating.md
published: 2026-10-16
updated: 2026-10-17
---

[Home](https://www.strongrate.us/) › [Fiberglass grating](https://www.strongrate.us/fiberglass-grating/)

# Fiberglass Grating (FRP Grating)

_Updated Oct 17, 2026_

Fiberglass grating, or FRP (fiber-reinforced plastic) grating, is non-conductive floor grating made in two main types: molded panels, typically about 30–35% glass, and pultruded bar grating, typically about 65–70% glass. Choose molded for trench covers, chemical plants and two-way strength; choose pultruded for longer spans. Strongrate makes both in Nantong, China.

## What is FRP grating?

FRP stands for fiber-reinforced plastic, often written fiberglass-reinforced plastic: glass-fiber reinforcement set in a thermoset resin such as isophthalic polyester, vinyl ester or phenolic. The same product is sold as fiberglass grating, FRP grating, composite grating or fiberglass floor grating; in the UK it is called GRP (glass-reinforced plastic) grating.

Fiberglass grating is non-conductive, and US makers describe it as up to 70–75% lighter than steel grating. How it compares on cost and service life: [fiberglass vs steel grating](https://www.strongrate.us/compare/fiberglass-vs-steel-grating/).

## Molded or pultruded: which fiberglass grating do you need?

Molded grating is cast as one piece with strength in both directions and is the usual choice for trench covers, general flooring and chemical plants. Pultruded grating is built from bearing bars joined by cross rods, is marketed as about twice as stiff, and suits platforms, mezzanines and walkways with longer spans. Compare load tables at your actual span before deciding.

**Molded vs pultruded fiberglass grating: values US makers publish**

| Attribute | Molded fiberglass grating | Pultruded fiberglass grating |
| --- | --- | --- |
| How it is made | One-piece panel cast in a mold; strength in both directions | Pultruded bearing bars joined by cross rods, commonly 6" (152 mm) on center |
| Glass content by weight | about 30–35% [note 1] | about 65–70% [note 1] |
| Stiffness | Baseline | Marketed as about 2× stiffer than molded [note 2] |
| Common depths | 1" (25 mm), 1-1/2" (38 mm) and 2" (51 mm) | 1" (25 mm) and 1-1/2" (38 mm) I-bar; 2" (51 mm) T-bar |
| Open area | about 70% (1-1/2" square mesh) [note 3] | I-bar about 40% or 60%; T-bar about 33% or 50% [note 4] |
| Weight at 1-1/2" (38 mm) deep (lb/ft²) | 3.75–3.94 lb/ft² (18.3–19.2 kg/m²) [note 3] | 2.8–3.0 lb/ft² (13.7–14.6 kg/m²), 60%-open I-bar [note 3] |
| Slip-resistant surface | Concave (meniscus) top or applied quartz grit | Bonded grit |
| Typical uses | Trench covers, general flooring, chemical plants | Platforms, mezzanines, bridge walkways |
| Strongrate glass content (catalog) | 30–35% by weight | 60–65% |
| Strongrate range (catalog) | 19 meshes, 1/2" (13 mm) to 2-9/16" (65 mm) deep, 1.2–10.7 lb/ft² (5.8–52.0 kg/m²) [note 5] | 36 types, 1" (25 mm) to 3" (76 mm) deep, 1.7–15.1 lb/ft² (8.5–73.6 kg/m²) [note 5] |

_Industry rows compiled Oct 2026 from US makers. Strongrate rows are values from its 2023 catalog, confirmed in your quote and submittal drawings before design use. Every Strongrate mesh and type with its weight and open area: [fiberglass grating sizes, weight and open area](https://www.strongrate.us/resources/fiberglass-grating-sizes-weight-and-open-area/). The full comparison is on [molded vs pultruded fiberglass grating](https://www.strongrate.us/compare/molded-vs-pultruded-fiberglass-grating/)._

Notes:

1. Typical published figure, not Strongrate data.
2. A marketing comparison; compare actual load tables.
3. Typical published figures from US makers, not Strongrate data.
4. Typical published options from US makers, not Strongrate data.
5. Values as printed in the factory catalog (2023).

_Diagram: Molded fiberglass grating: a one-piece square-mesh panel with bars in both directions. Schematic — not to scale._

_Diagram: Pultruded fiberglass grating: I-shaped bearing bars tied together by cross rods. Schematic — not to scale._

- [Molded fiberglass grating](https://www.strongrate.us/molded-fiberglass-grating/): Molded fiberglass (FRP) grating by depth and mesh, with panel sizes, resins and the DNV-listed models. (Product family)
- [Pultruded fiberglass grating](https://www.strongrate.us/pultruded-fiberglass-grating/): Pultruded fiberglass (FRP) I-bar and T-bar grating by depth and open area, with span guidance. (Product family)

## What sizes do fiberglass grating panels come in?

Molded fiberglass grating panels come in four common US sizes, plus 4 ft × 6 ft (1220 × 1830 mm) for heavy-duty panels. Pultruded panels are commonly 3, 4 or 5 ft (915, 1220 or 1525 mm) wide and up to 20 ft (6.10 m) long. Strongrate’s 2023 catalog lists three of the four molded sizes, plus 5 ft × 13.12 ft (1524 × 4000 mm), and pultruded panels up to 5 ft × 20 ft (1524 × 6100 mm).

**Common US fiberglass grating panel sizes (molded) and the sizes in Strongrate’s catalog**

| Panel size, ft (mm) | Area (sq ft) | Typical use | Strongrate catalog (printed size) |
| --- | ---: | --- | --- |
| 3 ft × 10 ft (915 × 3050 mm) | 30 | Standard molded panel | Listed as 3 ft × 10 ft (921 × 3050 mm) for 8 meshes (square, mini, rectangular) [note 1] |
| 4 ft × 8 ft (1220 × 2440 mm) | 32 | Standard molded panel | Listed as 4 ft × 8 ft (1220 × 2440 mm) for 4 meshes (square, mini) [note 1] |
| 4 ft × 12 ft (1220 × 3660 mm) | 48 | Standard molded panel | Listed as 4 ft × 12 ft (1220 × 3660 mm) for 11 meshes (square, mini, rectangular) [note 1] |
| 5 ft × 10 ft (1525 × 3050 mm) | 50 | Standard molded panel | Not listed; the catalog’s 5 ft molded panel is 5 ft × 13.12 ft (1524 × 4000 mm) [note 1] |
| 4 ft × 6 ft (1220 × 1830 mm) | 24 | Heavy-duty molded panel | Listed as 4 ft × 6 ft (1220 × 1830 mm) for 1 mesh (rectangular) [note 1] |

_The first three columns are US industry norms from makers’ catalogs, with metric sizes rounded to the nearest 5 mm; the last column gives the size as printed in Strongrate’s 2023 catalog. Weights, depths and open area by size: [fiberglass grating sizes, weight and open area](https://www.strongrate.us/resources/fiberglass-grating-sizes-weight-and-open-area/)._

Notes:

1. Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings.

## Which Strongrate fiberglass grating models are DNV type-approved?

Six Strongrate models are listed on DNV Type Approval TAF0000191 Rev. 1: [1" (25 mm) deep](https://www.strongrate.us/molded-fiberglass-grating/1-inch-square-mesh/), 1-1/4" (32 mm) deep and [1-1/2" (38 mm) deep](https://www.strongrate.us/molded-fiberglass-grating/1-5-inch-square-mesh/) molded square mesh, a [rectangular-mesh molded](https://www.strongrate.us/molded-fiberglass-grating/1x4-rectangular-mesh/) model, and the [I 6015 I-bar](https://www.strongrate.us/pultruded-fiberglass-grating/i-bar-1-5-inch/) and [T5020 T-bar](https://www.strongrate.us/pultruded-fiberglass-grating/t-bar-2-inch/) pultruded models. Their ASTM E84-19a flame spread indexes run from 5 to 20. The certificate covers fire properties, not structural strength; see [certifications and test reports](https://www.strongrate.us/about/certifications-and-test-reports/).

## Which fiberglass grating options does Strongrate list?

Beyond the six DNV type-approved models, Strongrate’s 2023 product catalog and its websites list the options below. Send the option, size and quantity with your quote request.

**Strongrate fiberglass grating options**

| Option | What Strongrate lists |
| --- | --- |
| Molded mesh | 4 square and 10 rectangular meshes, 1/2" (13 mm) to 2-9/16" (65 mm) deep (catalog) [note 1] |
| Mini mesh | 5 mini meshes with openings from 1/2" (13 mm) to 1" (26 mm) (catalog) [note 1] |
| Gritted top | Gritted top on molded and pultruded grating; slip coefficient 0.91 for the normal grit, citing ASTM D2047 (catalog) [note 2] |
| Concave top | Concave (meniscus) top on molded grating (catalog) |
| Cross-groove top | Cross-groove molded grating (website listing) |
| Covered (solid top) | Solid covers with a checker or grit finish, molded and pultruded (catalog) |
| Heavy-duty molded | 1-1/2" × 1-1/2" (38 × 38 mm) heavy duty, 2" (50 mm) to 2-9/16" (65 mm) deep, and the 1" × 2" (25 × 51 mm) mesh (catalog) [notes 1, 3] |
| High-load pultruded | HI and HL I-bar series: 13 types, 1" (25 mm) to 3" (76 mm) deep, 40–60% open; the catalog gives HI spans under AASHTO truck, car and forklift wheel loads [note 1] |
| Pultruded T-bar | T-bar series: 10 types, 1" (25 mm) to 2" (50 mm) deep, 12–50% open (catalog; T5020 is on the DNV certificate) [notes 1, 4] |
| Pultruded I-bar | I-bar and SI series: 13 types, 1" (25 mm) to 1-1/2" (38 mm) deep, 40–83% open (catalog; I 6015 is on the DNV certificate) [notes 1, 4] |
| Resins | Vinyl ester, isophthalic polyester, food-grade isophthalic, and orthophthalic polyester (molded only), all fire retardant (catalog) [note 5] |
| Stair treads and tread covers | Molded tread covers and one-piece tread panels, pultruded grating treads, and stair nosing covers (catalog) [note 1] |
| Clips | Six clip types (L, M, C, W, J and G), mainly stainless steel (catalog) [note 6] |

_Catalog entries are as printed in Strongrate’s 2023 product catalog; website entries are product titles on strongrate.com and strongrate.cn. Values are confirmed in your quote and submittal drawings._

Notes:

1. Values as printed in the factory catalog (2023).
2. Catalog value.
3. Deflections as printed in the factory catalog (2023), static loads at ambient temperature; confirm for your span in the submittal before final design.
4. Bar depth and open area are not stated on the certificate.
5. Maximum service temperatures as printed in the catalog’s resin table; its chemical-resistance chart prints lower maximums.
6. The catalog’s Chinese text also lists galvanized steel; the clip material is stated in your quote.

- [Fiberglass stair tread covers](https://www.strongrate.us/fiberglass-stair-tread-covers/): Gritted covers that retrofit worn or slippery steps without replacing the stair. (Product)
- [Fiberglass grating clips](https://www.strongrate.us/accessories/fiberglass-grating-clips/): Hold-down clips by type, the spacing rules in guide specifications, and clips per panel. (Accessory)
- [Fiberglass stair treads](https://www.strongrate.us/fiberglass-stair-treads/): Molded and pultruded fiberglass stair treads from Strongrate’s catalog, with OSHA 1910.25 stair rules and design loads. (Molded and pultruded)

## Where is fiberglass grating used?

A US distributor’s guide recommends molded grating for trench covers, general flooring and chemical plants, and pultruded grating for platforms, mezzanines and bridge walkways. Because it is non-conductive, fiberglass grating is also marketed for electrical flooring.

- [Fiberglass car wash grating](https://www.strongrate.us/applications/car-wash-grating/): Fiberglass grating for car wash pits, trenches and bays: configurations and what to specify. (Application)
- [Fiberglass dock and marina grating](https://www.strongrate.us/applications/dock-and-marina-grating/): Fiberglass grating for docks, piers and marinas: resin and UV considerations, surfaces and sizes. (Application)
- [Fiberglass trench covers and drain grates](https://www.strongrate.us/applications/trench-covers-and-drain-grates/): Fiberglass trench covers and drain grates: pedestrian versus vehicle loads and sizes. (Application)

## How much do fiberglass grating panels cost?

Strongrate quotes per project in USD, with the Incoterm and quote date stated. For context, published vendor price guides put molded grating at about $12–$18 per sq ft and pultruded at about $20–$28 per sq ft, and US stocking distributors’ published prices for full-size molded panels, 1-1/2" and 2" deep with square mesh, run from about $9 to $17 per sq ft (Oct 2026). These are other sellers’ prices, not Strongrate prices. See [fiberglass grating price per square foot](https://www.strongrate.us/pricing/fiberglass-grating-price/) and [FRP grating landed cost, duty and freight](https://www.strongrate.us/buy-direct/landed-cost-duty-and-freight/).

## Frequently asked questions

### How do I choose the depth of fiberglass grating?

Choose the depth from a load table at your clear span and design load, not from the panel size. Common US molded depths are 1" (25 mm), 1-1/2" (38 mm) and 2" (51 mm). Makers’ published safe loads rest on safety factors from 2:1 to 5:1, so compare tables on the same basis. How to read them: [fiberglass grating load tables](https://www.strongrate.us/resources/fiberglass-grating-load-tables/).

### What colors does fiberglass grating come in?

Standard US colors are yellow, dark gray, light gray and green, and orange commonly signals vinyl ester resin. Ask for the colors available in your resin with your quote.

### Which resin should I choose for fiberglass grating?

Isophthalic polyester suits general industrial use, vinyl ester harsher chemical service, and phenolic marine and offshore work. Strongrate’s catalog lists fire-retardant vinyl ester, isophthalic, food-grade isophthalic and orthophthalic resins, with a chemical-resistance chart on the [fiberglass grating specifications](https://www.strongrate.us/resources/fiberglass-grating-specifications/) page; send your chemicals, concentrations and temperatures with your [quote request](https://www.strongrate.us/request-quote/).

## Related pages
- [Factory-direct fiberglass grating from Strongrate](https://www.strongrate.us/): Factory-direct molded and pultruded fiberglass (FRP) grating made in Nantong, China, for US and Canadian container and project orders; small or urgent orders are referred to US stocking importers.
- [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 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.
- [Molded vs pultruded grating](https://www.strongrate.us/compare/molded-vs-pultruded-fiberglass-grating/): How molded and pultruded fiberglass grating differ in manufacture, glass content, stiffness, weight, open area and cost, with a decision table by application.

**Request a quote:** https://www.strongrate.us/request-quote/ · Order a sample: https://www.strongrate.us/samples/ — Get a quote by panel size: send the type, depth, mesh, panel size, resin, quantity and destination ZIP or postal code. Quotes within 1 business day (US Central time).

## Sources
- [DNV Type Approval Certificate TAF0000191 Rev. 1 (ASTM E84-19a results)](https://www.shipserv.com/Shipserv/pages/profiles/261792/certifications/20241010142426209-DNV-GL-Certificate-GRATINGS-Strongrate.pdf) (accessed Oct 15, 2026)
- [strongrate.com product listings (page titles)](https://www.strongrate.com/) (accessed Oct 15, 2026)
- [strongrate.cn product listings (page titles)](https://www.strongrate.cn/) (accessed Oct 15, 2026)
- Strongrate product catalog “Your Best FRP Solution” (image PDF, Sep 2023), supplied by the site owner (accessed Oct 17, 2026)
- [Fibergrate FAQ](https://www.fibergrate.com/resource-center/faq/) (accessed Oct 15, 2026)
- [Fibergrate pultruded grating page](https://www.fibergrate.com/products/pultruded-grating/) (accessed Oct 15, 2026)
- [Fibergrate molded FRP products brochure](https://www.fibergrate.com/media/166803/molded-frp-products-brochure.pdf) (accessed Oct 15, 2026)
- [Fibergrate, Molded FRP Grating Details and Options](https://www.fibergrate.com/media/181504/molded-frp-grating-details-and-options.pdf) (accessed Oct 15, 2026)
- [McNichols molded fiberglass grating catalog](https://www.mcnichols.com/fiberglass-grating/molded) (accessed Oct 15, 2026)
- [Grating Pacific, molded fiberglass grating page](https://gratingpacific.com/product/molded-fiberglass-grating/) (accessed Oct 15, 2026)
- [Direct Metals, product applications](https://www.directmetals.com/resources/product-applications/) (accessed Oct 15, 2026)
- [Grating Pacific, Pultruded Sizes and Options](https://gratingpacific.com/wp-content/uploads/2019/10/Pultruded-Sizes-Options.pdf) (accessed Oct 15, 2026)
- [Strongwell grating page (DURADEK)](https://www.strongwell.com/products/grating/) (accessed Oct 15, 2026)
- [Direct Metals blog, Pultruded vs molded fiberglass grating (Jan 15, 2026)](https://www.directmetals.com/blog/pultruded-fiberglass-grating-vs-molded-fiberglass-grating-which-is-right-for-your-needs/) (accessed Oct 15, 2026)
- [American Grating Resin Selection Guide](https://www.americangrating.com/ResinSelectionGuide.aspx) (accessed Oct 15, 2026)
- [Fibergrate FRP benefits page](https://www.fibergrate.com/frp-benefits/) (accessed Oct 15, 2026)
- [FRP vendor price guides (GTO FRP 2025 guide; Income Pultrusion guide, undated)](https://incomepultrusion.com/frp-grating-price-guide/) (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.