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Pultruded Fiberglass Grating: I-Bar and T-Bar

Updated

Pultruded fiberglass grating is assembled from glass-rich pultruded bars joined by cross bars, so it is stiffer along the bars than molded grating. Strongrate's catalog lists 36 pultruded types in I-bar and T-bar profiles, with 60–65% glass content and panels up to 5 ft × 20 ft (1524 × 6100 mm). Its two DNV-listed models, I 6015 and T5020, each have an ASTM E84-19a flame spread index of 20.

Pultruded I-bar fiberglass grating, sectionSection through four parallel I-shaped load bars joined by a cross rod, showing bar spacing center to center, the depth and the openings between bars.Section across the load barsBar spacingcenter to centerI-bar (load bar)DepthOpeningCross rodPultruded I-bar fiberglass grating, plan viewPlan strip showing parallel load bars held at a fixed spacing by cross rods that run across them.PlanLoad barsCross rods
Pultruded I-bar grating: bearing bars joined by a cross bar, in section and planSchematic — not to scale

Which pultruded grating types does Strongrate list?

The T-bar pedestrian series comes in 1" (25 mm), 1-1/2" (38 mm) and 2" (50 mm) depths at 12–50% open area, and the I-bar industrial series in 1" (25 mm), 1-3/16" (30 mm) and 1-1/2" (38 mm) at 40–60%. All types use cross bars at 6" (152 mm) centers, with the bearing bars along the panel length.

  • 1" I-bar pultruded gratingCatalog types I-4010, I-5010 and I-6010: open area, weight, line- and uniform-load deflection, resins.
  • DNV-listed I 60151-1/2" I-bar pultruded gratingCatalog types I-4015, I-5015 and I-6015 with load tables, and the fire data of DNV-listed I 6015.
  • DNV-listed T50202" T-bar pultruded gratingCatalog types T-3320 and T-5020 with load tables, and the fire data of DNV-listed T5020.
Strongrate T-bar pultruded grating (pedestrian series): catalog data
TypeBar shapeDepthBearing-bar centersCross-bar centersOpen areaWeight
T-12101T-bar1" (25 mm)11.71" (43.4 mm)16" (152 mm)112%13.0 lb/ft² (14.5 kg/m²)1
T-18101T-bar1" (25 mm)12.00" (50.8 mm)16" (152 mm)118%12.8 lb/ft² (13.8 kg/m²)1
T-25101T-bar1" (25 mm)12.00" (50.8 mm)16" (152 mm)125%12.8 lb/ft² (13.6 kg/m²)1
T-33101T-bar1" (25 mm)12.40" (61.0 mm)16" (152 mm)133%12.3 lb/ft² (11.2 kg/m²)1
T-38101T-bar1" (25 mm)12.40" (61.0 mm)16" (152 mm)138%12.1 lb/ft² (10.2 kg/m²)1
T-12151T-bar1-1/2" (38 mm)11.70" (43.3 mm)16" (152 mm)112%14.0 lb/ft² (19.6 kg/m²)1
T-25151T-bar1-1/2" (38 mm)12.00" (50.8 mm)16" (152 mm)125%13.4 lb/ft² (16.7 kg/m²)1
T-38151T-bar1-1/2" (38 mm)12.40" (61.0 mm)16" (152 mm)138%12.9 lb/ft² (14.2 kg/m²)1
T-33201T-bar2" (50 mm)11.50" (38.1 mm)16" (152 mm)133%14.2 lb/ft² (20.3 kg/m²)1
T-50201T-bar2" (50 mm)12.00" (50.8 mm)16" (152 mm)150%13.2 lb/ft² (15.7 kg/m²)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. 1Values as printed in the factory catalog (2023).
Strongrate I-bar pultruded grating (industrial series): catalog data
TypeBar shapeDepthBearing-bar centersCross-bar centersOpen areaWeight
I-40101I-bar1" (25 mm)11.00" (25.4 mm)16" (152 mm)140%13.5 lb/ft² (17.1 kg/m²)1
I-50101I-bar1" (25 mm)11.18" (30.0 mm)16" (152 mm)150%12.9 lb/ft² (14.2 kg/m²)1
I-60101I-bar1" (25 mm)11.50" (38.1 mm)16" (152 mm)160%12.3 lb/ft² (11.2 kg/m²)1
I-401251I-bar1-3/16" (30 mm)11.00" (25.4 mm)16" (152 mm)140%14.1 lb/ft² (19.8 kg/m²)1
I-501251I-bar1-3/16" (30 mm)11.20" (30.5 mm)16" (152 mm)150%13.6 lb/ft² (17.4 kg/m²)1
I-601251I-bar1-3/16" (30 mm)11.46" (37.1 mm)16" (152 mm)160%12.8 lb/ft² (13.5 kg/m²)1
I-40151I-bar1-1/2" (38 mm)11.00" (25.4 mm)16" (152 mm)140%14.5 lb/ft² (22.0 kg/m²)1
I-50151I-bar1-1/2" (38 mm)11.20" (30.5 mm)16" (152 mm)150%13.9 lb/ft² (19.1 kg/m²)1
I-60151I-bar1-1/2" (38 mm)11.46" (37.1 mm)16" (152 mm)160%13.3 lb/ft² (16.1 kg/m²)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. 1Values as printed in the factory catalog (2023).

What are the HI, HL and SI series for?

HI and HL are high-load I-bar grating: HI in 1" (25 mm), 1-1/2" (38 mm), 2" (50 mm), 2-1/2" (64 mm) and 3" (76 mm) depths at 47–58% open, and HL at 2" (50 mm), weighing 4.3–15.1 lb/ft² (21.0–73.6 kg/m²). SI is a lighter, more open standard I-bar at 1" (25 mm) and 1-1/2" (38 mm), 73–83% open and 1.7–3.8 lb/ft² (8.5–18.6 kg/m²). Vehicle or forklift use needs review by your engineer.

Strongrate high-load I-bar pultruded grating (HI and HL series): catalog data
TypeBar shapeDepthBearing-bar centersCross-bar centersOpen areaWeight
HI-47101I-bar, high load1" (25 mm)11.19" (30.2 mm)16" (152 mm)147%15.7 lb/ft² (27.6 kg/m²)1
HI-47151I-bar, high load1-1/2" (38 mm)11.19" (30.2 mm)16" (152 mm)147%18.2 lb/ft² (40.0 kg/m²)1
HI-47201I-bar, high load2" (50 mm)11.19" (30.2 mm)16" (152 mm)147%111.2 lb/ft² (54.5 kg/m²)1
HI-47251I-bar, high load2-1/2" (64 mm)11.19" (30.2 mm)16" (152 mm)147%112.6 lb/ft² (61.6 kg/m²)1
HI-47301I-bar, high load3" (76 mm)11.19" (30.2 mm)16" (152 mm)147%115.1 lb/ft² (73.6 kg/m²)1
HI-58101I-bar, high load1" (25 mm)11.50" (38.1 mm)16" (152 mm)158%14.3 lb/ft² (21.0 kg/m²)1
HI-58151I-bar, high load1-1/2" (38 mm)11.50" (38.1 mm)16" (152 mm)158%16.5 lb/ft² (31.8 kg/m²)1
HI-58201I-bar, high load2" (50 mm)11.50" (38.1 mm)16" (152 mm)158%18.7 lb/ft² (42.5 kg/m²)1
HI-58251I-bar, high load2-1/2" (64 mm)11.50" (38.1 mm)16" (152 mm)158%110.0 lb/ft² (48.9 kg/m²)1
HI-58301I-bar, high load3" (76 mm)11.50" (38.1 mm)16" (152 mm)158%112.0 lb/ft² (58.6 kg/m²)1
HL-40201I-bar, high load2" (50 mm)11.00" (25.4 mm)16" (152 mm)140%114.4 lb/ft² (70.4 kg/m²)1
HL-50201I-bar, high load2" (50 mm)11.18" (30.0 mm)16" (152 mm)150%110.7 lb/ft² (52.2 kg/m²)1
HL-60201I-bar, high load2" (50 mm)11.50" (38.1 mm)16" (152 mm)160%18.9 lb/ft² (43.5 kg/m²)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. 1Values as printed in the factory catalog (2023).
Strongrate standard I-bar pultruded grating (SI series): catalog data
TypeBar shapeDepthBearing-bar centersCross-bar centersOpen areaWeight
SI-73101I-bar, standard1" (25 mm)11.19" (30.2 mm)16" (152 mm)173%12.7 lb/ft² (13.2 kg/m²)1
SI-73151I-bar, standard1-1/2" (38 mm)11.19" (30.2 mm)16" (152 mm)173%13.8 lb/ft² (18.6 kg/m²)1
SI-83101I-bar, standard1" (25 mm)11.87" (47.6 mm)16" (152 mm)183%11.7 lb/ft² (8.5 kg/m²)1
SI-83151I-bar, standard1-1/2" (38 mm)11.87" (47.6 mm)16" (152 mm)183%12.5 lb/ft² (12.0 kg/m²)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. 1Values as printed in the factory catalog (2023).

Should you choose I-bar or T-bar pultruded grating?

Pultruded T-bar fiberglass grating, sectionSection through T-shaped load bars with wide top flanges joined by a cross rod; the openings are narrow slots at the walking surface between the flanges.Section across the load barsOpening at thewalking surfaceT-bar top flangeDepthWeb (load-carrying)Cross rod
Pultruded T-bar grating: wide top flanges form the walking surface, in sectionSchematic — not to scale

I-bars have a flange at the top and the bottom; T-bars have a wide top flange, so the openings sit between flanges at the walking surface and the open area is lower (12–50% for T-bar against 40–60% for I-bar in Strongrate's catalog). Against molded grating, pultruded spans farther along its bars, while molded carries load both ways; see molded vs pultruded fiberglass grating.

  1. Take the design load and deflection limit from your specification.
  2. Pick the shallowest profile whose load table meets both at your clear span (fiberglass grating load tables).
  3. Check the clear opening where small objects must not fall through, or where the route must be accessible.
  4. Choose the resin for the chemicals and temperatures on site, then compare prices on the same resin and open area.

What fire test results does Strongrate have for pultruded grating?

Strongrate pultruded grating models on DNV Type Approval TAF0000191 Rev. 1, with ASTM E84-19a results
DNV modelProfileResinFlame spread index (FSI)Smoke-developed index (SDI)Structural fire integrityDepth (per catalog)
I 60151Pultruded I-bar1Isophthalic polyester12024002L0 per ASTM F3059-1531-1/2" (38 mm)4
T50201Pultruded T-bar1Vinyl ester12023002L0 per ASTM F3059-1532" (50 mm)4
Results as listed on the DNV certificate (ASTM E84-19a), valid until Feb 10, 2027; the depth column is from Strongrate’s 2023 catalog. Each result applies to its own model and resin. The certificate covers fire performance, not load capacity.

Notes

  1. 1Bar depth and open area are not stated on the certificate.
  2. 2Result as listed on DNV certificate TAF0000191 Rev. 1 (ASTM E84-19a); applies to this model only.
  3. 3As stated on the certificate; acceptance for a given location is case by case.
  4. 4Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings.

Both flame spread indexes are within the 25 that US specifications call Class 1 or Class A, and both smoke-developed indexes within the 450 building-code limit. More on ASTM E84 Class 1 fire rating and certifications and test reports.

Which resins and surfaces are available?

Three fire-retardant resins for pultruded grating: vinyl ester (VEFR), isophthalic polyester (IFR) and food-grade isophthalic polyester (FG). Tops are corrugated (slotted), gritted or smooth, with solid covers in checker or grit finish.

Strongrate resin systems: catalog data
CodeResinUseCorrosion resistanceProductsMax temperature
VEFR1Vinyl esterSuperior corrosion resistance, fire retardantExcellentMolded and pultruded230°F (110°C)1
IFR1Isophthalic polyesterIndustrial-grade corrosion resistance, fire retardantVery goodMolded and pultruded176°F (80°C)1
FG1Isophthalic polyester, food gradeFood-grade corrosion resistance, fire retardantVery goodMolded and pultruded176°F (80°C)1
OFR1Orthophthalic polyesterModerate corrosion resistance, fire retardantModerateMolded only158°F (70°C)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. 1Maximum 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.

How do you order pultruded 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 basis, lead times, MOQ and shipping, or request a quote.

Pultruded grating takes its own hold-down clips; see fiberglass grating clips, how to install fiberglass grating and how to cut fiberglass grating.

Frequently asked questions

Is pultruded grating weaker across the bars than along them?

It is built to carry load along its bearing bars, which run parallel to the panel length on stock panels, with cross bars tying the bars together. Molded grating is cast in one piece with strength in both directions, so it fits better where load must be carried both ways. Plan panel length so the bars span between the supports.

Can I get a sample of pultruded grating before ordering?

Yes, ask through the samples page, which lists the DNV-listed pultruded models I 6015 and T5020.

Can pultruded grating be used on an accessible route?

Only if its openings do not pass a 1/2" (13 mm) sphere and the slots run perpendicular to the dominant direction of travel (ADA 302.3). Mini mesh ADA grating is the molded alternative.

Request a quote

Send profile, depth, open area, clear span, design load, quantity and ZIP code for pultruded grating. Quotes within 1 business day (US Central time).

Request a quoteOrder a sample
Sources
  1. Strongrate product catalog “Your Best FRP Solution” (image PDF, Sep 2023), supplied by the site owner (accessed Oct 17, 2026)
  2. DNV Type Approval Certificate TAF0000191 Rev. 1, including ASTM E84-19a results (PDF hosted on Strongrate’s ShipServ supplier profile) (accessed Oct 15, 2026)
  3. Fibergrate pultruded grating page (accessed Oct 15, 2026)
  4. Fiberglass-AFI, Fire-retardant FRP and the FRP fire code (summary of the IBC) (accessed Oct 15, 2026)
  5. U.S. Access Board, Guide to the ADA Standards, Chapter 3: Floor and Ground Surfaces (accessed Oct 15, 2026)