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TreadSpec™ FRP GRATING DEFLECTION CALCULATOR AND CLIP SELECTOR
Treadwell’s TreadSpec™ FRP grating deflection calculator and clip selector are designed to simplify, accelerate, and improve the reliability of FRP grating specification for real-world projects.
In this Tech Talk Tuesday session, the TreadSpec™ platform is introduced as an online self-service tool where users can:
- Review a library of FRP grating and structural profiles.
- Run deflection checks on moulded, pultruded, and micro-mesh grating for both uniformly distributed loads and concentrated line loads.
- Match the selected grating to the correct fixing system using an application-based clip selector.
- Generate project-ready PDF outputs that record input spans, loads and resulting deflections for design files and approval workflows.
The webinar focuses on two key parts of TreadSpec™ that specifiers use most often during early design and layout:
- The FRP grating deflection calculator for GratEX® moulded grating, MoultrEX® pultruded grating, and GridEX® pultruded grating
- The fixing and clip selector that helps match the chosen grating to the correct clip and fastener combination based on product type and support thickness.
The session also reinforces the design philosophy behind TreadSpec™. The tool is designed around serviceability and user comfort, with clear guidance on mid-span deflection limits, span-to-deflection ratios, and how these relate to Australian Standards, including AS 1657 (fixed platforms and walkways) and AS 1170 (loading guidance).
Key Benefits
1. Faster, more confident FRP grating design
- Quickly select from Treadwell’s core FRP grating ranges, including mini mesh, standard mesh and pultruded load bar profiles.
- See key product attributes at a glance, including self-weight per square metre, slip resistance rating, compliance with AS 1428.1 accessibility requirements, DDA suitability, and 15 millimetre dropped-ball compliance for overhead walkways.
- Run instant deflection checks for both uniformly distributed loads and concentrated line loads so that you can test different spans and loads without manual calculations.
2. Built-in serviceability and comfort checks
- TreadSpec™ reports both mid-span deflection in millimetres and span-to-deflection ratios to align with typical serviceability criteria.
- The tool highlights that FRP design is typically governed by deflection at the serviceability limit state, rather than by ultimate strength, which helps designers select spans that feel solid underfoot rather than merely passing strength checks.
- Guidance indicates that pedestrian comfort is typically achieved when mid-span deflection is kept below approximately 5 mm. That span over 250 is a sensible upper bound for durability in most applications, with higher deflections only considered on a project-specific basis.
3. Reliable span checks for both UDL and line loads
- Users can switch between distributed load and concentrated line load checks in the same interface.
- Line load testing is based on recognised grating test methods that use a standard sample width and mid-span loading to simulate real walking and wheel point loads.
- When inputs exceed the recommended limits for a given product and span, the tool clearly flags this in red, helping designers avoid unsafe assumptions before drawings are issued.
4. Clip and fixing selection made simple
- The grating clip selector filters available fixing options based on the chosen grating type and support thickness, then shows the compatible clip families for that scenario.
- Common top-clip types, such as Mini M clips and W clips, are illustrated with simple visuals to help users understand how each fixing engages with the grating load bars.
- The tool also suggests matching underside clips, such as J-clips that clamp to the flange of a steel universal beam or channel, helping ensure proper clamping without guesswork.
- For each fixing combination, TreadSpec™ outputs the correct Treadwell product codes, recommended fastener type, and minimum fastener length, ensuring purchasing and detailing remain aligned.
5. Better documentation and traceability
- Each span or fixing check can be exported as a PDF, including the input parameters and calculated results, so engineers and asset owners have a traceable record in their design files.
- This documentation supports internal reviews, third-party certification, and future maintenance or upgrade discussions, since the original design assumptions are clearly captured.
Applications
1. Industrial platforms and walkways
TreadSpec™ is particularly useful for designers working on FRP platforms and walkways in industrial plants, treatment facilities and processing environments. Typical use cases include:
- Access platforms around pumps, tanks and process equipment
- Walkways over pipe racks, channels and trenches
- Raised inspection decks in water and wastewater facilities
Designers can test spans for standard loads per AS 1657 or AS 1170 and quickly confirm whether the chosen grating thickness and profile will remain stable underfoot.
2. Public access boardwalks and viewing structures
Where FRP grating is used in public environments such as boardwalks, jetties and viewing decks, TreadSpec™ helps:
- Check spans for higher public loading categories.
- Confirm that the mini mesh panels meet the dropped-ball and accessibility requirements.
- Pair the right clip system with supporting FRP or steel framing so that fixings meet durability and serviceability expectations in coastal or corrosive environments.
3. Corrosive and high-risk environments
In environments where corrosive media or aggressive cleaning regimes are present, the combination of FRP grating and suitable clips is critical:
- Water and wastewater treatment plants
- Chemical process facilities
- Coastal and marine structures
TreadSpec™ helps refine spans to support long-term durability and provides a structured way to choose clips and fasteners that suit both the grating product and the substrate material.
4. Design development and value engineering
During early stage design and value engineering, engineers can use TreadSpec™ to:
- Compare different grating thicknesses and profiles for the same load case to understand the tradeoff between depth, deflection and material usage
- Rationalise spans to standard panel sizes that optimise cutting, wastage and installation time
- Pre-select fixing types that suit site constraints, such as limited access below the grating or restrictions on hot works.
Key Moments
- 00:13 "👋 Welcome to Tech Talk Tuesday; overview of TreadSpec™ tool and upcoming webinars.
- 00:41 📚 TreadSpec™ allows users to check deflection for beams, columns, and FRP grating.
- 01:35 ❓ Questions during the webinar are encouraged; responses provided when possible.
- 02:01 ⚙️ Introduction to the grating deflection calculator and selecting appropriate grating products.
- 02:30 🔍 Details about the three types of FRP grating available: GratEX®, MoultrEX®, GridEX®.
- 03:48 📐 Compliance with Australian standards regarding safety and load limits for FRP grating.
- 04:45 📏 Line load test parameters and recommended reading in the American Composite Manufacturers Association's manual.
- 05:43 ⚖️ Load conditions in calculations are for static loads at ambient temperatures; dynamic loads require special consideration.
- 09:11 🛑 Deflection limits: less than 5mm for pedestrian comfort and maximum durability limits.
- 10:31 🛠️ Overview of fixing selection tool to find suitable fasteners for chosen grating products.
- 12:17 📧 Option to email summary of selected grating and fixing details as a PDF document.
- 15:34 📖 ACMA Grading Manual recommended for those specifying FRP products on projects.
- 17:30 🔧 Components typically made from 316 stainless steel and options available for galvanized steel."
Why Treadwell?
Treadwell has invested in TreadSpec™ to give specifiers and asset owners a practical, transparent way to work with FRP grating and structural products.
By embedding core design principles from recognised FRP design guides into an accessible online tool, Treadwell helps project teams:
- Design for real serviceability, not just theoretical capacity, so end users experience solid, predictable walking surfaces.
- Reduce design risk by clearly showing when a selected product-span combination exceeds recommended limits.
- Standardise fixing selection, which supports safer, more consistent installation outcomes across multiple projects and contractors.
- Save time in both design and documentation, allowing teams to focus on higher-level layout and coordination rather than repetitive calculation work.
Backed by experience across industrial, infrastructure, and public access projects, Treadwell uses tools such as TreadSpec™ to bridge the gap between FRP product data and practical site performance.
