---
title: "Fiberglass Grating Specifications: CSI 06 74 13 Guide Spec"
description: "Fiberglass grating specifications in CSI 06 74 13 three-part format: editable load, deflection, fire, clip, warranty and origin clauses, and a compliance table."
url: https://www.strongrate.us/resources/fiberglass-grating-specifications/
markdown: https://www.strongrate.us/resources/fiberglass-grating-specifications.md
published: 2026-10-16
updated: 2026-10-17
---

[Home](https://www.strongrate.us/) › [Resources](https://www.strongrate.us/resources/) › [Specifications](https://www.strongrate.us/resources/fiberglass-grating-specifications/)

# Fiberglass Grating Specification (Guide Spec)

_Updated Oct 17, 2026_

Fiberglass grating specifications go under CSI MasterFormat Section 06 74 13 (older specs use 06610) and usually reference the ANSI/ACMA FGMC grating manual. Use the three-part guide spec below and edit the bracketed options. It calls for an ASTM E84 flame spread index of 25 or less; set the origin clause to match the project’s funding.

> **How to use this guide specification.** Text in [brackets] is an option or value to choose or edit. **Specifier’s notes** explain the choices and are not part of the specification. A plain-text copy is at [fiberglass-grating-specifications.md](https://www.strongrate.us/resources/fiberglass-grating-specifications.md).

## Part 1: General

### 1.1 Summary

1. Section includes: [molded fiberglass grating] [pultruded fiberglass grating] [fiberglass stair treads] [hold-down clips and fasteners] [field cutting and edge sealing].
2. Related work specified elsewhere: [structural supports] [guardrails and handrails] [stairs and ladders].

### 1.2 References

- ASTM E84: surface burning characteristics (flame spread index and smoke-developed index).
- ASTM D635: burning behavior of plastics in a horizontal position.
- [UL 94: flammability of plastic materials.]
- ANSI/ACMA FGMC FRP Composites Grating Manual, 2nd edition (2019).
- [ASTM D638, D790 and D2344: tensile, flexural and short-beam shear properties, for pultruded bars.]
- [ASTM D4060: abrasion resistance, for grit surfaces.]
- OSHA 29 CFR 1910.22, 1910.23, 1910.25 and 1910.29.
- 2010 ADA Standards for Accessible Design, §302.3.
- International Building Code, Chapter 26 (Section 2612) and Chapter 8 [edition adopted by the jurisdiction].
- [ASTM F3059: fire integrity of FRP grating on vessels and offshore installations.]
- [AASHTO LRFD Guide Specifications for the Design of FRP Pedestrian Bridges, 2nd edition (2025).]
- [CSA S806:26: design and construction of building structures with fiber-reinforced polymers, for Canadian projects.]

### 1.3 Performance requirements

1. Walking-working surfaces: support the maximum intended load (OSHA 29 CFR 1910.22(b)).
2. Design load: [60 psf (2.9 kPa) uniform live load per ASCE 7] [100 psf (4.8 kPa) uniform or 300 lb (1.3 kN) concentrated] [as shown on the drawings].
3. Deflection at design load: [not more than 1/4" (6.4 mm)] [not more than 3/8" (9.5 mm) or L/120, whichever is less].
4. Supporting members: deflection not more than L/180 [coordinate with the structural design].
5. Stair treads: [100 psf (4.8 kPa) uniform or 300 lb (1.3 kN) concentrated over 4 in² (2581 mm²)]. Stairs: not less than five times the normal live load and not less than a 1,000 lb (4.4 kN) concentrated load (OSHA 29 CFR 1910.25).
6. Impact or dynamic loads: [use half the tabulated capacity] [double the design load] when selecting grating from the load tables.
7. Accessible routes: openings shall not allow passage of a 1/2" (13 mm) diameter sphere; elongated openings perpendicular to the dominant direction of travel (2010 ADA Standards §302.3).
8. Surface burning: flame spread index of [25] or less per ASTM E84, tested on the finished grating [and smoke-developed index of 450 or less where Class A interior finish is required].
9. [Self-extinguishing per ASTM D635; grating shall not burn past the 1" (25 mm) reference mark.]
10. [Flammability rating of V-0 per UL 94.]

**Specifier’s note:** choose loads and deflection limits with the project engineer; typical pedestrian loads in load-table notes are 50–65 psf (2.4–3.1 kPa). Require fire data on the finished grating, not the resin alone. See [fiberglass grating load tables](https://www.strongrate.us/resources/fiberglass-grating-load-tables/) and [ASTM E84 Class 1 fire rating](https://www.strongrate.us/resources/astm-e84-class-1-fire-rating/).

### 1.4 Submittals

1. Product data for each grating type: resin, color, surface, depth, mesh or bar profile, and open area.
2. Load and deflection tables for each product at the spans shown, stating the test method, safety factor and deflection basis.
3. Corrosion-resistance tables for the resin proposed [for the chemicals listed in the schedule].
4. ASTM E84 test reports on the finished grating in the proposed resin, identifying the laboratory, report number and test date. Data from tests on the resin alone is not acceptable.
5. Certificates of compliance [and type-approval certificates for marine and offshore use].
6. Shop drawings: panel layout, bearing-bar direction, support locations, cutouts and clip locations.
7. Samples of each type of product.
8. Warranty.

### 1.5 Quality assurance

1. Load tables: based on tests per the ANSI/ACMA FGMC grating manual [or another method approved by the engineer].
2. [Maximum recommended loads based on acoustic emission testing; panel stiffness not more than 2.5% below published values.]
3. [Manufacturer’s quality-system certification: ______.]
4. Fire test reports: issued by a third-party laboratory for the product and resin supplied.

### 1.6 Delivery, storage and handling

1. Store resin and edge-sealing kits at 70–85°F (21–29°C) [or as the kit supplier instructs].
2. [Marine and offshore projects under a type approval: each grating marked with the brand and fire rating, and the manufacturer’s manual supplied with the product.]

### 1.7 Warranty

1. Manufacturer’s [1-year] [3-year] limited warranty against defects in materials and workmanship, starting at [delivery] [substantial completion].

**Specifier’s note:** published US grating warranties run from 1 to 3 years. Strongrate terms are on [terms, warranty and returns](https://www.strongrate.us/buy-direct/terms-warranty-and-returns/).

### 1.8 Country of manufacture

- **Option A** (no domestic-content requirement): no restriction on country of manufacture. The submittals shall state the country of manufacture.
- **Option B** (Build America, Buy America applies): fiberglass grating, treads and other plastic or polymer-based composite products shall be produced in the United States, with all manufacturing processes in the United States, per 2 CFR part 184.

**Specifier’s note:** use Option B on infrastructure projects that receive federal financial assistance covered by BABA. Strongrate grating is made in Nantong, China, and does not qualify under Option B. Privately funded industrial, commercial and marine projects are not subject to BABA, though the owner may still require US manufacture. See [Buy America (BABA) and imported FRP grating](https://www.strongrate.us/buy-direct/buy-america-baba/).

## Part 2: Products

### 2.1 Manufacturers

1. Basis of design: [manufacturer and product line].
2. [Nantong Strongrate Co., Ltd., Nantong, Jiangsu, China (products ship from China): products for which the submittals in Article 1.4 meet this section.]
3. Substitutions: [per Division 01]; submit the data listed in Article 1.4.

### 2.2 Molded fiberglass grating

1. Construction: one-piece molded panels with load-bearing bars in both directions.
2. Resin: [isophthalic polyester] [vinyl ester] [fire-retardant polyester] [food-grade isophthalic with antimicrobial additive] [______].
3. Glass content: [not more than 35% by weight].
4. Depth: [1" (25 mm)] [1-1/2" (38 mm)] [2" (51 mm)]. Mesh: [1-1/2" × 1-1/2" (38 × 38 mm) square] [______].
5. Tolerances: depth and mesh ±1/16" (1.6 mm); fillet radius at bar intersections not less than 1/16" (1.6 mm); top reinforcement not more than 1/8" (3.2 mm) below the top surface.
6. Surface: [concave (meniscus)] [applied quartz grit] [fine grit for barefoot areas].
7. Color: [yellow] [dark gray] [light gray] [green] [______].
8. Products exposed to weather shall contain an ultraviolet inhibitor.
9. Fire performance: as specified in Article 1.3.

**Specifier’s note:** Strongrate’s catalog lists 30–35% glass by weight for molded grating, with UV inhibitors in the resin, and concave, gritted, smooth and solid-cover surfaces ([materials below](https://www.strongrate.us/resources/fiberglass-grating-specifications/#strongrate-materials)).

### 2.3 Pultruded fiberglass grating

1. Construction: pultruded [I-bar] [T-bar] bearing bars joined by cross rods at [6" (152 mm)] on center.
2. Bar depth and open area: [1" (25 mm) I-bar] [1-1/2" (38 mm) I-bar] at [40%] [60%] open; [2" (51 mm) T-bar] at [33%] [50%] open.
3. Minimum bar properties: tensile and flexural strength 30,000 psi (207 MPa); flexural modulus 1.8 × 10⁶ psi (12.4 GPa); short-beam shear 4,500 psi (31 MPa); tested per ASTM D638, D790 and D2344.
4. Grit surface: wear index below 1.0 per ASTM D4060, before and after 750 hours of UV exposure.
5. Resin, color, ultraviolet inhibitor and fire performance: as specified for molded grating.
6. Drilled holes and cut ends: sealed as specified in Article 2.5.

**Specifier’s note:** Strongrate’s catalog lists 60–65% glass content for pultruded grating, and its DNV-listed models I 6015 at 1-1/2" (38 mm) deep, 60% open, and T5020 at 2" (50 mm) deep, 50% open. See [pultruded fiberglass grating](https://www.strongrate.us/pultruded-fiberglass-grating/).

### 2.4 Stair treads

1. Treads: [molded] [pultruded] fiberglass grating with a gritted nosing [in a contrasting color], sized to the stringers shown.
2. Load: as specified in Article 1.3.
3. Stair geometry (OSHA 29 CFR 1910.25, standard stairs): angle 30° to 50°; risers not more than 9-1/2" (241 mm); treads not less than 9-1/2" (241 mm) deep; width not less than 22" (559 mm) [verify against the building code].

**Specifier’s note:** Strongrate’s catalog lists molded tread covers with a gritted nosing in a contrasting color and pultruded grating treads with a gritted tube nosing. See [fiberglass stair treads](https://www.strongrate.us/fiberglass-stair-treads/).

### 2.5 Fasteners and accessories

1. Hold-down clips: Type 316 stainless steel, spaced not more than 4 ft (1.22 m) apart, with not fewer than four clips per piece of grating [or more where the manufacturer recommends].
2. Cut edges, cutouts and drilled holes: sealed with [vinyl ester] [catalyzed] resin compatible with the grating resin.
3. [Guardrails where required: top rail 42" ± 3" (1067 ± 76 mm) above the walking surface, withstanding a 200 lb (0.9 kN) force; toeboards not less than 3-1/2" (89 mm) high (OSHA 29 CFR 1910.29).]

**Specifier’s note:** Strongrate’s catalog lists six clip types (L, M, C, W, J and G), made mainly of stainless steel. See [fiberglass grating clips](https://www.strongrate.us/accessories/fiberglass-grating-clips/).

## Part 3: Execution

### 3.1 Examination

1. Verify that supports are level and that support spacing does not exceed the spans used to select the grating from the load tables.
2. Report deviations in writing before starting installation.

### 3.2 Installation

1. Lay panels with the bearing bars spanning between supports. [Pultruded stock panels: bearing bars run parallel to the panel length.]
2. Provide not less than [1-1/2" (38 mm)] of bearing on each support.
3. Fasten with hold-down clips as specified in Article 2.5.
4. On accessible routes, orient elongated openings perpendicular to the dominant direction of travel.
5. Cut with carbide or diamond tooling; seal all cut edges, cutouts and drilled holes with resin as specified in Article 2.5.
6. Openings cut in panels: provide added support [where the opening exceeds ______] [as the manufacturer recommends].

See [how to install fiberglass grating](https://www.strongrate.us/resources/how-to-install-fiberglass-grating/) and [how to cut fiberglass grating](https://www.strongrate.us/resources/how-to-cut-fiberglass-grating/).

### 3.3 Inspection and maintenance

1. Before acceptance, inspect for loose or missing clips, unsealed cuts and damaged panels, and correct them.
2. Owner: inspect walking-working surfaces regularly and have hazardous conditions corrected or repaired by a qualified person (OSHA 29 CFR 1910.22(d)).

## What materials does Strongrate’s catalog specify?

Product data from Strongrate’s 2023 catalog for an or-equal submittal. Values are factory-published; confirm them in your quote and submittal drawings before design use.

**Strongrate resin systems: catalog data**

| Code | Resin | Use | Corrosion resistance | Products | Max temperature |
| --- | --- | --- | --- | --- | ---: |
| VEFR [note 1] | Vinyl ester | Superior corrosion resistance, fire retardant | Excellent | Molded and pultruded | 230°F (110°C) [note 1] |
| IFR [note 1] | Isophthalic polyester | Industrial-grade corrosion resistance, fire retardant | Very good | Molded and pultruded | 176°F (80°C) [note 1] |
| FG [note 1] | Isophthalic polyester, food grade | Food-grade corrosion resistance, fire retardant | Very good | Molded and pultruded | 176°F (80°C) [note 1] |
| OFR [note 1] | Orthophthalic polyester | Moderate corrosion resistance, fire retardant | Moderate | Molded only | 158°F (70°C) [note 1] |

_As printed in Strongrate’s 2023 product catalog; confirmed in your quote and submittal drawings. The catalog rates every resin system ASTM E84 Class 1 (flame spread 25 or less); test results on file cover only the DNV-listed models. Its chemical-resistance chart prints lower maximum temperatures (vinyl ester 185°F (85°C), isophthalic 158°F (70°C), general-purpose polyester 149°F (65°C))._

Notes:

1. Maximum service temperatures as printed in the catalog’s resin table.

- General information from resin makers’ data, as printed in the catalog; testing in the actual environment is recommended.

- Glass: E-glass roving for molded and pultruded products, with aluminum hydroxide filler for fire retardance.
- Glass content by weight: 30–35% for molded grating; 60–65% for pultruded grating.
- Molded resin additives: fire retardants, UV inhibitors and antioxidants.
- Surfaces: concave (meniscus) top on molded grating; corrugated (slotted) top on pultruded grating; gritted and smooth tops on both; solid covers with a checker or grit finish on both.
- Slip resistance: slip coefficient 0.91 for the normal grit surface, citing ASTM D2047 (catalog value).
- Color and UV: colors stable for more than 12 months in sunlight without visible fading; designed life more than 20 years (catalog statements, not a warranty).

The catalog’s chemical-resistance chart rates each resin against 76 chemical environments; common plant chemicals follow. Send your chemicals, concentrations and temperatures with your [quote request](https://www.strongrate.us/request-quote/) for the rest.

**Chemical resistance of Strongrate grating by resin: catalog chart**

| Chemical | Concentration, % | Temperature | Vinyl ester | Isophthalic | General purpose |
| --- | --- | --- | --- | --- | --- |
| Acetic Acid | 50 | Chart max | Continuous | Splash and spill | Continuous |
| Calcium Hypochlorite | All | Chart max | Occasional splash | Occasional splash | Not recommended |
| Chlorine - Dry Gas | All | Chart max | Continuous | Splash and spill | Splash and spill |
| Crude Oil (Sweet or Sour) | All | Chart max | Continuous | Continuous | Continuous |
| Diesel Fuel | All | 98.6°F (37°C) | Continuous | Continuous | Continuous |
| Ferric Chloride | 100 | Chart max | Continuous | Continuous | Continuous |
| Gasoline | All | 118.4°F (48°C) | Continuous | Splash and spill | Splash and spill |
| Hydrogen Peroxide | 30 | 78.8°F (26°C) | Splash and spill | Not recommended | Not recommended |
| Nitric Acid | 20 | 118.4°F (48°C) | Occasional splash | Occasional splash | Occasional splash |
| Phosphoric Acid | 80 | Chart max | Continuous | Continuous | Splash and spill |
| Sodium Hydroxide | 10 | Chart max | Occasional splash | Not recommended | Not recommended |
| Sodium Hydroxide | 50 | Chart max | Not recommended | Not recommended | Not recommended |
| Sulfuric Acid | 10 | Chart max | Continuous | Splash and spill | Splash and spill |
| Sulfuric Acid | 25 | Chart max | Splash and spill | Splash and spill | Occasional splash |
| Sulfuric Acid | 75 | 98.6°F (37°C) | Occasional splash | Occasional splash | Not recommended |
| Water (Distilled) | All | Chart max | Continuous | Continuous | Continuous |

_Continuous: continuous exposure. Splash and spill: frequent splashes and spills. Occasional splash: infrequent splashes, cleaned up at once. “Chart max” is the chart’s maximum for the resin: 185°F (85°C) vinyl ester, 158°F (70°C) isophthalic, 149°F (65°C) general-purpose polyester. General information from resin makers’ data, as printed in Strongrate’s 2023 catalog; test in the actual environment._

Notes:

- Testing in the actual environment is recommended.

## How does Strongrate grating compare with fiberglass grating specifications?

Common US guide-spec requirements against Strongrate’s documented values. Fire results are detailed on [ASTM E84 Class 1 fire rating](https://www.strongrate.us/resources/astm-e84-class-1-fire-rating/), and the certificate on [certifications and test reports](https://www.strongrate.us/about/certifications-and-test-reports/).

**Fiberglass grating specifications compared: common US guide-spec requirements and Strongrate’s documented values**

| Requirement | Typical guide-spec value | Strongrate |
| --- | --- | --- |
| ASTM E84 flame spread index | 25 or less, on the finished grating [note 1] | 5–20 for the six DNV-listed models (DNV); the catalog rates every resin Class 1 [notes 2, 3] |
| ASTM E84 smoke-developed index | 450 or less where IBC Class A applies [note 4] | 15–400 for the six DNV-listed models [note 2] |
| Load and deflection tables | Tested per the ANSI/ACMA FGMC grating manual | Catalog deflection tables by span, stated as tested to the ANSI/ACMA manual [note 5] |
| Molded glass content | Not more than 35% [note 6] | 30–35% by weight (catalog) |
| UV inhibitor for outdoor use | Required | UV inhibitors in the molded resin (catalog) |
| Hold-down clips | Type 316 stainless, not over 4 ft (1.22 m) apart, at least four per piece | Six clip types, mainly stainless steel (catalog) [note 7] |
| Country of manufacture | US manufacture required on BABA projects | Made in Nantong, China; not eligible for BABA-covered projects |

_Typical values are from US guide specifications and the standards cited._

Notes:

1. A specification threshold, not a test result.
2. Applies only to the six models listed on DNV certificate TAF0000191 Rev. 1.
3. Maximum service temperatures as printed in the catalog’s resin table; its chemical-resistance chart prints lower maximums.
4. Check the building code edition your jurisdiction has adopted.
5. Catalog tables; confirm the values for your span in the submittal before final design.
6. Typical published figure, not Strongrate data.
7. The catalog’s Chinese text also lists galvanized steel; the clip material is stated in your quote.

## Frequently asked questions

### Can Strongrate grating be submitted as an or-equal?

On privately funded projects whose specification allows equals, yes, once the submittals in Article 1.4 are met. It cannot be offered on BABA-covered federally funded projects, because it is made in China.

### Which MasterFormat section number covers fiberglass grating?

Section 06 74 13 in current CSI MasterFormat. Older specifications use the five-digit number 06610.

### Why should the spec ask for fire tests on the finished grating?

US guide specifications reject fire data run only on the resin. Ask for the ASTM E84 report on the exact product and resin you will buy; Strongrate’s six documented results are listed on DNV Type Approval TAF0000191 Rev. 1.

## 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.
- [ASTM E84 fire rating](https://www.strongrate.us/resources/astm-e84-class-1-fire-rating/): What ASTM E84 Class 1 (Class A) means for FRP grating, the flame spread and smoke-developed indexes of Strongrate’s six DNV-listed models, and how to specify fire performance.
- [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.
- [Buy America (BABA) and fiberglass grating](https://www.strongrate.us/buy-direct/buy-america-baba/): Why fiberglass grating made in China, including Strongrate’s, does not qualify for federally funded infrastructure under Build America, Buy America (BABA), which programs are covered, and why privately funded projects are unaffected.
- [Fiberglass grating certifications and test reports](https://www.strongrate.us/about/certifications-and-test-reports/): Strongrate’s fiberglass grating certification, DNV Type Approval TAF0000191 Rev. 1, what it covers, and the ASTM E84-19a results for its six listed models.
- [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 specification section, drawings, quantities and ZIP code with your quote request. 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)
- [Strongwell Section 06 74 13 FRP Molded Grating and Stair Treads specification; NY OGS master spec 067413](https://www.strongwell.com/wp-content/uploads/2013/03/StrongwellSpecs-Molded-Grating-and-Treads.pdf) (accessed Oct 15, 2026)
- [Strongwell Section 06 74 13 pultruded spec (revised Nov 2024)](https://www.strongwell.com/wp-content/uploads/2014/10/StrongwellSpecs-FRP-Pultruded-Grating-and-Treads.pdf) (accessed Oct 15, 2026)
- [Fibergrate molded grating guide specification (Section 06610)](https://www.fibergrate.com/media/180193/fibergrate-frp-molded-grating-specs.pdf) (accessed Oct 15, 2026)
- [ACMA, release of the 2nd edition national standard fiberglass grating manual](https://acmanet.org/acma-releases-2nd-edition-national-standard-fiberglass-grating-manual/) (accessed Oct 15, 2026)
- [Fiberglass-AFI, Fire-retardant FRP and the FRP fire code (secondary summary of the IBC)](https://www.fiberglass-afi.com/specifications/fire-retardant-frp-and-the-frp-fire-code/) (accessed Oct 15, 2026)
- [CSA Group store, CSA S806:26](https://www.csagroup.org/store/product/CSA_S806:26/) (accessed Oct 15, 2026)
- [OSHA 29 CFR 1910.22, Walking-working surfaces: general requirements](https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.22) (accessed Oct 15, 2026)
- [OSHA 29 CFR 1910.25, Stairways](https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.25) (accessed Oct 15, 2026)
- [OSHA 29 CFR 1910.29, Fall protection systems and falling object protection](https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.29) (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)
- [Federal Register 2023-17724 (2 CFR 184); EPA BABA FAQs for manufacturers (Jun 2025)](https://www.federalregister.gov/documents/2023/08/23/2023-17724/2-cfr-parts-184-and-200-guidance-for-grants-and-agreements) (accessed Oct 15, 2026)
- [DNV Type Approval Certificate TAF0000191 Rev. 1 (PDF hosted on Strongrate’s ShipServ supplier profile 261792)](https://www.shipserv.com/Shipserv/pages/profiles/261792/certifications/20241010142426209-DNV-GL-Certificate-GRATINGS-Strongrate.pdf) (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.