Walkable Polycarbonate Skylights: Load Ratings, Thickness Tables and Safety Standards
Can You Walk on a Polycarbonate Skylight?
The short answer: only if the panel is specified, framed and installed for foot traffic. A standard 6–10 mm multiwall skylight panel is not walkable; a correctly engineered 16–25 mm solid or multiwall assembly with fixed supports can carry a maintenance worker’s weight when the span is kept inside the rated envelope. This guide gives the load tables, support-spacing rules and safety standards that determine whether a polycarbonate roof panel is walkable in your application.
Walkable Polycarbonate: Load Rating Basics
Walkability is not a property of the sheet alone — it is a property of the assembly: sheet thickness + wall structure + support spacing + fixing method. The governing loads are:
- Live load (walking person): typically 1.5 kN (≈150 kg) concentrated load per EN 1991-1-1 or 40 psf distributed per ASCE 7 in North America
- Maintenance load: 1.0–1.5 kN point load for occasional access (EN 1991-1-1 Table 6.2)
- Snow / wind: regional values, often the governing case in practice
Thickness and Span Table for Walkable Polycarbonate
The table below is a conservative starting point for maintenance-only foot traffic (one person, no equipment, no concentrated tools). Final design must be confirmed against your project load case and tested span.
| Sheet type | Thickness | Max span (walking) | Typical use |
|---|---|---|---|
| Solid PC (clear) | 16 mm | 600–800 mm | Access hatches, short runways |
| Solid PC (clear) | 20–25 mm | 900–1,200 mm | Maintenance walkways, platforms |
| Multiwall 6-wall X | 16 mm | 500–700 mm | Heavy-traffic skylight runs |
| Multiwall 6-wall X | 20–25 mm | 800–1,000 mm | Walkable roof lights, plant rooms |
| Corrugated profile | 3–4 mm | Not for foot traffic | Roofing only — use walk boards |
Important: spans above assume continuous support along both edges and perimeter fixing every 150–200 mm. Never walk on panels spanning wider than the table value, even for “inspection” — polycarbonate deflects visibly before failure, and deflection under 1.5 kN can exceed safe limits.
Safety Standards and References
- EN 1991-1-1 (Eurocode 1): live loads on roofs, maintenance load categories
- ASCE 7-22: minimum roof live loads (USA)
- ASTM D256: Izod impact strength (polycarbonate ≈ 850 J/m, vs acrylic ≈ 30 J/m)
- ISO 178: flexural properties for span calculation
- EN 13501-1: reaction to fire classification for the assembly
How to Specify a Walkable Polycarbonate Roof Panel
- Confirm the load case — maintenance-only (1.5 kN) or regular access (higher live load)
- Choose sheet type — solid for maximum point-load resistance; 6-wall multiwall for insulation + moderate loads
- Set span from the table, then reduce by 20% for safety if unsure about support quality
- Fix every 150–200 mm along supported edges; use washered fasteners or aluminium pressure plates
- Add fall protection — walkable panels are not a substitute for guardrails or safety nets where regulations require them
- Send the drawing to the factory — thickness, span, fixing and load case in one RFQ gets a verified answer
FAQ: Walking on Polycarbonate Skylights
How thick does polycarbonate need to be to walk on?
For maintenance foot traffic, start at 16 mm solid or 16 mm 6-wall multiwall with spans under 700–800 mm. 20–25 mm extends the safe span to ~1.2 m. Corrugated profiles are never walkable.
What is the load rating of a 25 mm solid polycarbonate sheet?
Under a 1.5 kN point load with supports at 900–1,000 mm, a 25 mm solid panel typically stays within acceptable deflection. Exact rating depends on support spacing and edge fixing — confirm with the supplier’s span table.
Can I walk on 10 mm twin-wall polycarbonate?
Not safely. 10 mm twin-wall is for glazing and light roofing, not foot traffic. Use walk boards, or specify 16 mm+ 6-wall or solid.
Does polycarbonate crack under foot traffic?
Polycarbonate does not shatter like glass, but it can deform permanently if deflected beyond yield. The risk is not breakage — it is excessive deflection and panel pop-out from the frame. Span control prevents both.
Do I need a safety net under a walkable skylight?
Check local codes. For glazing in accessible roofs, EN 14351-1 and local regulations often require fall protection or laminated walkway systems regardless of sheet strength.
Get a Verified Span for Your Project
Send your drawing with thickness, span, support spacing, load case and fixing method to Bakway. As an IATF 16949 certified extruder, we confirm the assembly — not just the sheet — against your project requirements, with a mill certificate on request.
Walk-on Load Table: What Thickness Can You Walk On?
| Thickness & structure | Max point load (typical) | Support spacing | Walk-on suitability |
|---|---|---|---|
| 6 mm solid | ~15 kg point | 400 mm | Maintenance traffic only — no regular walking |
| 10 mm solid | ~35 kg point | 500 mm | Occasional maintenance walking |
| 12 mm solid | ~55 kg point | 600 mm | Regular foot traffic (single person) |
| 16 mm solid | ~80 kg point | 700 mm | Walkable skylight standard |
| 20 mm solid | ~110 kg point | 800 mm | Walkable + equipment access |
Values are indicative for UV-stabilised solid PC at 22°C, simply supported, with 40 mm end bearing. Real designs must be confirmed by an engineer for your exact span, framing and regional loads — send us your drawings and we will verify the structure before quoting.
What thickness polycarbonate can you walk on?
For regular foot traffic choose at least 12 mm solid polycarbonate at 600 mm support spacing; 16 mm solid is the standard for walkable skylights. Multiwall sheets are not designed for walking — always use solid sheets for walkable installations.
Do walkable polycarbonate skylights meet safety standards?
Yes, when correctly specified. Walkable PC skylights are commonly used with fall-protection framing and non-slip surface treatments, and can be designed to meet EN 14963 (rooflights) load classes and CWCT/CIBSE guidance for pedestrian access.