Car wash grating covers equipment pits, trench drains and bay floors that stay wet every day, and fiberglass is an established material for it. Use gritted molded grating where people walk, and heavy-duty grating with a wheel-load rating where tires cross. One US car-wash supplier lists a 4 ft × 8 ft (1220 × 2440 mm) panel at $491.60 (Oct 15, 2026); Strongrate quotes per project in USD.
Where does a car wash use fiberglass grating?
US suppliers publish car-wash case studies, and buyers search for car wash pit grating and floor drain grating. The traffic over each area decides the product: foot traffic only, or tires. Molded grating is cast as one piece with strength in both directions, and a US distributor recommends it for trench covers and general flooring.
| Car wash grating location | Traffic | What to specify | In Strongrate’s catalog |
|---|---|---|---|
| Trench drains across a bay or tunnel | Tires and people | Heavy-duty grating with a published wheel-load rating at the trench’s clear span; hold-down clips | HI high-load pultruded grating, with spans under car and truck wheel loads; engineer review required1 |
| Equipment and reclaim pits | People and tools, no vehicles | Gritted molded grating sized from a load table at the pit’s clear span | Gritted-top molded grating, with deflection tables by span2 |
| Walkways beside the conveyor | People | Gritted or concave-top molded grating | Concave-top and gritted-top molded grating |
| Covers where spray or debris must not pass | People | Covered (solid-top) grating, which is also stiffer than open grating | Solid covers with a checker or grit finish |
| Outdoor self-serve bays and pads | Tires, people and sun | A wheel-load rating where tires cross, and a UV-inhibited resin | UV inhibitors in the molded resin; colors stated to hold 12+ months in sun3 |
Notes
- 1Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings.
- 2Catalog tables; confirm the values for your span in the submittal before final design.
- 3Catalog statements, not a warranty.
Can cars drive over fiberglass wash-bay grating?
Only grating that carries a published wheel-load rating for your span. US suppliers rate heavy-duty FRP grating for vehicle traffic up to AASHTO H-20 loading, using high-load molded or deep pultruded profiles. One maker’s heavy-duty span table is based on a 2,220 lb (9.9 kN) automobile wheel and 0.25" (6.4 mm) deflection, and makers advise halving tabulated capacities for impact or dynamic loads. Pedestrian spans for pits and walkways are compared on fiberglass grating load tables.
Strongrate’s 2023 catalog gives allowable spans for its HI high-load pultruded grating under automobile, AASHTO truck and forklift wheel loads, at 1/4" (6.4 mm) deflection with a safety factor of 3.0. Its heavy-duty molded grating has static deflection tables only, not a wheel-load rating. Values from Strongrate’s 2023 catalog are confirmed in your quote and submittal drawings; where tires cross, the span also needs your engineer’s review. Send the wheel load, tire width and the trench’s clear span with your request; see pultruded fiberglass grating and fiberglass trench covers and drain grates.
Which surface and resin suit a wash bay?
Molded grating normally comes with a concave (meniscus) top or an applied quartz grit. Strongrate’s catalog offers both on molded grating and states a slip coefficient of 0.91 for its normal grit surface, citing ASTM D2047. One US car-wash equipment supplier sells 1-1/2" (38 mm) deep isophthalic molded panels with a gray grit surface.
Choose the resin against the wash chemicals and water temperature. US grating resin systems include isophthalic polyester for general industrial use and vinyl ester for harsher chemical service. Published maximum service temperatures run about 150–160°F (66–71°C) for polyester systems and 185–200°F (85–93°C) for vinyl ester, and limits depend on the chemical. Send the safety data sheets for your detergents and the hottest water temperature with your quote request.
Strongrate’s catalog lists fire-retardant vinyl ester, rated for superior corrosion resistance, and isophthalic polyester for both molded and pultruded grating, plus orthophthalic polyester for molded only. For wash-bay chemicals, start from vinyl ester and check each product on its chart; the rows below are a selection, and the full chart is on fiberglass grating specifications. Match them to the ingredients on your detergents’ safety data sheets.
| Chemical | Concentration, % | Temperature | Vinyl ester | Isophthalic | General purpose |
|---|---|---|---|---|---|
| Ammonium Hydroxide | 20 | 78.8°F (26°C) | Occasional splash | Not recommended | Not recommended |
| Citric Acid | All | Chart max | Continuous | Continuous | Continuous |
| Diesel Fuel | All | 98.6°F (37°C) | Continuous | Continuous | Continuous |
| Gasoline | All | 118.4°F (48°C) | Continuous | Splash and spill | Splash and spill |
| Magnesium Chloride | All | Chart max | Continuous | Continuous | Continuous |
| 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 |
| Water (Distilled) | All | Chart max | Continuous | Continuous | Continuous |
Notes
- Testing in the actual environment is recommended.
Outdoor bays and pads also see sun: Strongwell’s guide specification requires that FRP products exposed to weather contain an ultraviolet inhibitor. Strongrate’s catalog puts UV inhibitors in its molded resin and states colors that hold for more than 12 months in sunlight. Standard US grating colors are yellow, dark gray, light gray and green; ask for the colors offered in your resin with your quote.
How much grating does a car wash project need?
Grating area is the grating width times the run length for every trench, pit and walkway, plus cut waste for your panel layout. The grating width is the clear opening plus bearing on both edges; Bedford’s fastener guidance calls for at least 1-1/2" (38 mm) of bearing on each support. Under about 500 sq ft, or needed in under 3 weeks, a US stocking importer is the better fit; project quantities are quoted factory-direct.
| Item | Count | Grating width, in (mm) | Length, ft (m) | Grating area, sq ft (m²) | How it is quoted |
|---|---|---|---|---|---|
| Trench drains across the tunnel | 3 | 18" (457 mm) | 20 ft (6.10 m) | 90 sq ft (8.4 m²) | — |
| Equipment pit cover | 1 | 48" (1219 mm) | 30 ft (9.14 m) | 120 sq ft (11.1 m²) | — |
| Total for one site | — | — | — | 210 sq ft (19.5 m²) | Under about 500 sq ft: referred to a US stocking importer |
| Same layout at 10 sites | — | — | — | 2,100 sq ft (195 m²) | Project quantity: factory-direct quote |
Notes
- Values as printed in the factory catalog (2023); confirmed in your quote and submittal drawings.
What does car wash grating cost?
Strongrate quotes car wash grating per project in USD, with the Incoterm and quote date. For a dated reference, one US car-wash equipment supplier lists a 4 ft × 8 ft (1220 × 2440 mm) panel of 1-1/2" (38 mm) isophthalic molded grating with gray grit at $491.60, about $15.36 per sq ft, shipped by freight or drop-ship only (Oct 15, 2026); that is a market benchmark, not a Strongrate price. See fiberglass grating price per square foot.
Strongrate grating is made in Nantong, China, and ships from China. Privately funded car washes are not subject to Build America, Buy America (BABA); see Buy America (BABA) and imported FRP grating.
Frequently asked questions
Can fiberglass grates replace the steel grates in an existing car wash?
Where tires cross, only with a wheel-load rating for your span, confirmed in your quote and reviewed by your engineer. Elsewhere, match the existing ledge depth and clear span: Strongrate’s catalog lists 1-1/2" square-mesh molded grating in 10 depths from 1/2" (13 mm) to 2-9/16" (65 mm), and each panel edge needs at least 1-1/2" (38 mm) of bearing (Bedford).
What should I send for a car wash grating quote?
A plan with every trench, pit and walkway and its clear span; the traffic (foot or vehicle, with wheel load); the wash chemicals’ safety data sheets and hottest water temperature; surface and color; quantity; and the delivery ZIP code. Send it through request a quote.
Is car wash grating cut to fit the trenches?
Yes, panels are cut to each trench or pit. Field cuts use carbide or diamond tooling, and guide specifications require sealing cut edges with resin; see how to cut fiberglass grating.
Request a quote
Send your car wash plan with trench and pit sizes, traffic and wash chemicals. Quotes within 1 business day (US Central time); the reply confirms routing and next steps.
Sources
- American Grating, FRP projects and applications (car-wash case studies) (accessed Oct 15, 2026)
- Kleen-Rite product listing: fiberglass gray grating with grit surface, 4 ft × 8 ft (Corvex resin) (accessed Oct 15, 2026)
- Grating Pacific, high load capacity grating; Direct Metals heavy-duty grating page (accessed Oct 15, 2026)
- Bedford PROGrate heavy-duty pultruded grating (allowable-span basis) (accessed Oct 15, 2026)
- Grating Pacific, Industrial Pultruded FRP Load Tables (impact loads) (accessed Oct 15, 2026)
- Fibergrate FAQ (molded and pultruded construction; surfaces) (accessed Oct 15, 2026)
- Direct Metals blog, Pultruded vs molded fiberglass grating (Jan 15, 2026) (accessed Oct 15, 2026)
- Strongrate website page titles (search index): gritted-top, concave-top and cover grating (accessed Oct 15, 2026)
- DNV Type Approval Certificate TAF0000191 Rev. 1 (resins of the six listed models) (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 molded FRP products brochure (resin systems) (accessed Oct 15, 2026)
- American Grating Resin Selection Guide and Molded Chemical Resistance Guide (accessed Oct 15, 2026)
- Strongwell Section 06 74 13, FRP Molded Grating and Stair Treads specification (UV inhibitor) (accessed Oct 15, 2026)
- Grating Pacific molded fiberglass grating page (colors) (accessed Oct 15, 2026)
- Bedford PROGrid and PROGrate Grating Catalog 2025 (minimum bearing) (accessed Oct 15, 2026)
- Fibergrate molded grating guide specification (cutting and sealing) (accessed Oct 15, 2026)
- Federal Register 2023-17724, 2 CFR parts 184 and 200 (Build America, Buy America scope) (accessed Oct 15, 2026)