Master Specification
Pultruded Fiberglass Reinforced Polymer (FRP) Grating
Master specification; adapt project notes before insertion.
Project notes: Bar type ______ (I/T) · Depth ______ mm · Resin ______ · Surface ______ · Color ______ · Live load ______ kN/m² · Clear span ______ mm · Deflection L/______ · Fasteners ______ · Thermal movement length ______ m.
PART 1 — GENERAL
1.1 Related Sections
Drawings and general provisions of the Contract, including Division 01, apply. Related: Section 05 52 13.13 (molded grating), Section 05 51 00 (FRP handrail), Section 14 22 00 (FRP ladders).
1.2 Summary
Specifies pultruded FRP grating built from continuous I- or T-shaped bearing bars tied by cross-rods, for long-span walkways, heavy-load platforms and industrial access. Covers bar geometry, glass content, span design, clips, torque and thermal movement.
1.3 System Description
Design pultruded panels as parallel simply supported bars. Bearing bars must run across the clear span. Provide flexural capacity at the specified load without exceeding L/200 (occupied), L/150 (general) or L/100 (heavy industrial) and a safety factor of not less than 5:1 on ultimate flexural strength, with long-term working stress limited to 25–33% of short-term ultimate per ZeAllgrate/ASME RTP-1 practice.
1.4 Submittals
Submit bar section properties (I, Z per bar), certified load/span tables at the design span, COA (glass content, Barcol, dimensions, batch), clip and torque schedule, and samples for color/surface.
PART 2 — PRODUCTS (MATERIALS)
2.1 Bearing Bars
Pultruded I or T profile, depth 40–75 mm, flange width 20–40 mm, web thickness 3–6 mm. Aligned continuous roving; glass content approximately 70% by weight. Cross-rods of stainless steel or FRP, Ø 6–10 mm, spaced 30–100 mm.
2.2 Resin
Isophthalic (general), vinyl ester (chemical/heat), novolac VE (aggressive/hot) or phenolic (fire/low-smoke). C-glass veil on bar surfaces for corrosion service; match resin to worst-case chemical × temperature.
2.3 Surface
Grit-top on walking face (mandatory for wet/oily service); smooth or concave bar top by approved submittal.
2.4 Fasteners
Stainless A4/316 G-clips, wedge clips or bolted clips with backing plates; FRP clips where total non-metallic isolation is required. Expansion clips and slotted holes for long runs.
PART 3 — EXECUTION (INSTALLATION)
3.1 Examination
Verify support spacing matches the design span; confirm bearing bars run across the span (reject any panel installed with bars parallel to the span).
3.2 Installation
Provide not less than 50 mm bearing per bar end. Fasten one clip per bearing bar at every support and at each corner; clip spacing ≤ 300 mm along supports. Torque snug: M6 ≈ 4–6 N·m, M8 ≈ 8–12 N·m, M10 ≈ 15–20 N·m — do not pretension like steel bolts. Leave 6–10 mm end gaps; use slotted holes/expansion clips on runs over ~6 m; frame free edges.
3.3 Field Modification
Cut with carbide-tipped saw; back panels when drilling bolt holes (use backing plate); round notches; seal cut edges with matching resin; re-clip after modification.
PART 4 — QUALITY
Manufacture under ISO 9001:2015. Verify: glass content ~70% (±5%); Barcol ≥ 35 (VE) / ≥ 40 (polyester); bar cross-section within ±2 mm; straight bars, no warping; cross-rods fully seated; no surface voids or delamination. Load certificate traceable to I/T bar test data at the design span and deflection limit. Reject bent bars, crushed webs and panels with missing or loose cross-rods.
Standards & Sources
- Industry pultruded grating metric design manual (manufacturer PDF) — bar section properties and load tables. Manufacturer technical data available upon request.
- ZeAllgrate — Guidelines for the Engineer/Designer (ACMA) — safety factors, long-term stress, connections.
- ASTM D790, D7290 (pultruded composites), D2583 (Barcol); OSHA 29 CFR 1910.23; ISO 14122; ASME RTP-1.
Supplementary Design Considerations
For pultruded grating, orientation is structural: bearing bars run along the span and across the supports, and the span is the clear distance between bearing lines. Section (bearing bar height up to 60 mm, bar spacing) is selected from the deflection-limited table at the project limit; the ~70% glass content delivers roughly twice the stiffness of molded construction, which is why long spans usually resolve to pultruded. Mesh opening and grit-top follow the walking/drainage duty, resin follows the chemical list, and lateral connection between bars is made by cross-rods or clips per the connection guide. Fire class confirmed against the E84 report for the exact grade.
For pultruded grating, orientation is structural: bearing bars run along the span and across the supports, and the span is the clear distance between bearing lines. Section (bearing bar height up to 60 mm, bar spacing) is selected from the deflection-limited table at the project limit; the ~70% glass content delivers roughly twice the stiffness of molded construction, which is why long spans usually resolve to pultruded. Mesh opening and grit-top follow the walking/drainage duty, resin follows the chemical list, and lateral connection between bars is made by cross-rods or clips per the connection guide. Fire class confirmed against the E84 report for the exact grade.Get This Spec in Word
Send bar type, span and load — ZeAllgrate returns the completed 05 52 13.16 section with a clip and torque schedule.