Can You Walk on Polycarbonate Sheets?

If you have a polycarbonate roof over a pergola, lean-to, carport or canopy, you may eventually need access for cleaning, maintenance or repairs. This raises an important question: can you walk on polycarbonate sheets?

No. You should not walk directly on multiwall polycarbonate roofing sheets.

Although polycarbonate is extremely strong and impact resistant, roofing sheets are not designed to support the concentrated weight of a person. Walking directly on them can damage the sheets and, more importantly, creates a serious risk of falling through the roof.

This applies to 10mm, 16mm and 25mm multiwall polycarbonate sheets.

Why Shouldn't You Walk on Polycarbonate Sheets?

Multiwall polycarbonate gets much of its strength from its internal structure. The sheet consists of thin polycarbonate layers connected by internal walls or ribs.

This creates a lightweight sheet with excellent strength for its weight, but that should not be confused with a surface designed for foot traffic.

Standing on a sheet places a concentrated load through a relatively small area. This can potentially cause:

• Cracking or buckling of the sheet
• Damage to the internal structure
• Damage around glazing bars and fixings
• Sheets becoming dislodged from the glazing system
• Scratching or damage to the UV-protective surface
• A serious risk of falling through the roof

For this reason, you should never assume that a polycarbonate roof is safe to stand or walk on.

Can You Walk on 10mm Polycarbonate Sheets?

No. 10mm multiwall polycarbonate sheets should not be walked on.

10mm sheets are commonly used for smaller roofing projects and other applications where the supporting structure is appropriately spaced.

Their impact resistance does not mean they are designed to carry a person's weight.

If you're deciding whether 10mm is appropriate for your project, see our 10mm polycarbonate sheets range and our guide to choosing the right polycarbonate sheet thickness.

Can You Walk on 16mm Polycarbonate Sheets?

You should not walk directly on 16mm polycarbonate sheets.

16mm multiwall is a popular choice for pergolas, lean-to roofs, canopies and many other domestic roofing projects because it provides a good balance of strength, insulation and light transmission.

However, the additional thickness does not turn the sheet into a walkable surface.

You can learn more about applications and options in our 16mm polycarbonate sheets range.

Can You Walk on 25mm Polycarbonate Sheets?

No. You should not walk directly on 25mm multiwall polycarbonate either.

Although 25mm sheets have a deeper multiwall structure and provide greater thermal performance than thinner sheets, they should still not be treated as a load-bearing walking surface.

For more information about when thicker sheets may be appropriate, see our 25mm polycarbonate sheets range.

How Do You Access a Polycarbonate Roof Safely?

Where roof access is unavoidable, your weight must not be supported directly by the polycarbonate sheets.

A suitable crawl board, access platform or similar system should be used so that the load is transferred to the structural supports beneath the roofing, rather than through the polycarbonate itself.

The board needs to span suitable structural members. Simply laying a plank on top of a sheet does not automatically make it safe.

Working at height carries significant risks, so appropriate access equipment and fall protection should be used. If you are unsure how to access the roof safely, use a suitably competent professional rather than climbing onto it.

Can You Stand on the Glazing Bars?

You should not assume that the glazing bars themselves are safe to stand on either.

A polycarbonate roofing system contains several components, but the roof should not be treated as a working platform unless it has specifically been designed for that purpose.

The timber or structural framework beneath the roof is what ultimately supports the roofing system.

If you're installing a new roof, our rafter spacing guide for polycarbonate roofing explains how the supporting structure and sheet widths work together.

What About Walking on Polycarbonate During Installation?

You shouldn't need to walk directly on the sheets during installation.

Plan the installation so that the roof can be assembled progressively while maintaining safe access to the supporting structure.

Our step-by-step multiwall polycarbonate installation guide explains the installation process in more detail.

Before starting your project, you can also use our Polycarbonate Roof Calculator to calculate the sheets, glazing bars and accessories required for your roof.

Is Polycarbonate Strong Enough to Withstand Hail and Impact?

This is where an important distinction needs to be made.

Polycarbonate is renowned for its impact resistance, which is one of the reasons it is so well suited to outdoor roofing. However:

Impact resistant does not mean walkable.

A roofing sheet resisting weather, hail or accidental impact is very different from supporting the concentrated load created by somebody standing on it.

The supporting structure, sheet thickness, span and installation system all contribute to the performance of a finished polycarbonate roof.

Can You Walk on a Wet Polycarbonate Roof?

You should not walk directly on a polycarbonate roof whether it is wet or dry, but wet conditions introduce another significant hazard.

Polycarbonate surfaces can become extremely slippery when wet.

Cleaning and maintenance should therefore be planned so that you can work safely without standing directly on the sheets.

How Can You Clean a Polycarbonate Roof Without Walking on It?

Most routine cleaning can be performed without climbing onto the polycarbonate sheets.

Depending on the size and accessibility of the roof, an extendable soft brush or similar equipment may allow you to clean the surface from a safe position.

Avoid abrasive tools or harsh cleaning products that could scratch or damage the sheet.

For larger or difficult-to-access roofs, using a professional cleaning or maintenance service may be the safer option.

Plan Your Polycarbonate Roof Correctly

A properly designed polycarbonate roof should have appropriate structural support, correctly spaced rafters and suitable glazing components.

If you're planning a pergola, lean-to, carport or canopy, our Polycarbonate Roof Calculator can help determine the sheets and accessories required for your dimensions.

You can also explore our multiwall polycarbonate sheets or order cut-to-size polycarbonate sheets for projects requiring specific dimensions.

Frequently Asked Questions

Can you stand directly on polycarbonate roofing?

No. You should not stand directly on multiwall polycarbonate roofing sheets. They are not designed as a walking or working surface.

Can you walk on 16mm polycarbonate?

No. Although 16mm multiwall polycarbonate is strong and impact resistant, it should not be walked on directly.

Can you walk on 25mm polycarbonate?

No. The additional thickness does not make 25mm multiwall polycarbonate a walkable surface.

Will polycarbonate crack if you stand on it?

It is possible to damage, buckle or dislodge polycarbonate roofing by applying concentrated loads. More importantly, standing on the sheets presents a serious fall risk.

How do you access a polycarbonate roof?

Where access is unavoidable, appropriate access equipment should transfer the load to suitable structural supports rather than the polycarbonate sheets. If you are unsure how to do this safely, use a competent professional.

Conclusion

You should never walk directly on multiwall polycarbonate roofing sheets.

This applies whether you have 10mm, 16mm or 25mm polycarbonate. While polycarbonate is exceptionally strong and impact resistant, roofing sheets are not designed to act as a walking platform.

For cleaning and maintenance, use methods that avoid placing your weight on the sheets. Where roof access is unavoidable, suitable access equipment should transfer the load to the supporting structure beneath the roof.