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What Warranty Comes with Polycarbonate Sheets?

“What warranty comes with polycarbonate sheets?”

The answer depends on the quality of the product and the manufacturer.

At Omega Build, we only supply Brett Martin Marlon ST multiwall polycarbonate sheets and Marlon FS solid polycarbonate sheets, both manufactured in the UK and backed by a 10-year manufacturer’s limited warranty when installed and maintained correctly.

If you’re looking for high-quality polycarbonate roofing sheets, you can browse our range here:

What Does the 10-Year Warranty Cover?

The manufacturer’s warranty is designed to give you confidence that your polycarbonate sheets will continue to perform for many years under normal outdoor conditions.

For Marlon ST Longlife multiwall polycarbonate sheets, the warranty covers:

✔ Weather Resistance

For 10 years, the sheets are warranted against breakage caused by normal weathering of the UV-protected surface.

✔ Light Transmission

The warranty also covers the long-term optical performance of the sheets.

During the 10-year period:

  • Light transmission will decrease by no more than 6%
  • The sheet will resist excessive yellowing caused by UV exposure within the manufacturer’s specified limits.

These are two of the key reasons why premium branded polycarbonate roofing sheets perform so much better than many lower-cost alternatives.

Does the Warranty Cover Hail Damage?

This is one of the questions we are asked most often.

The answer is yes—but with clearly defined limits.

The Brett Martin warranty states that hail damage claims are assessed using a recognised laboratory hail simulation test.

If a sheet remains unbroken after being struck by artificial hailstones measuring 20 mm in diameter travelling at 21 metres per second (approximately 47 mph), it does not qualify for a warranty claim.

This doesn’t mean your polycarbonate roofing sheets are easily damaged.

Quite the opposite.

Premium polycarbonate is exceptionally impact resistant and significantly tougher than glass. The hail test simply defines the manufacturer’s warranty threshold for unusually severe weather events.

What Conditions Must Be Met?

Like almost every building product, the warranty only applies if the sheets have been installed correctly.

To maintain the warranty:

  • Install the sheet with the UV-protected side facing outwards
  • Follow the manufacturer’s installation recommendations
  • Use the correct support centres
  • Avoid over-tightening screws or glazing bars
  • Store sheets correctly before installation
  • Handle, cut and drill the sheets using the manufacturer’s recommended methods.

Correct installation is essential to achieve the maximum lifespan from your polycarbonate sheets.

What Isn’t Covered?

The warranty has several important limitations.

It does not cover:

  • Damage caused by incorrect installation
  • Sheets installed with the UV-protected face inwards
  • Damage caused by incompatible chemicals, paints or adhesives
  • Sheets that have been heavily scratched or abused
  • Thermoformed or modified sheets
  • Damage resulting from improper handling or storage
  • Installation or labour costs associated with replacing sheets.

As with most manufacturer’s warranties, it covers the product itself rather than the cost of fitting or removing it.

What Happens if I Need to Make a Warranty Claim?

If a valid warranty claim is accepted, Brett Martin may either:

  • Supply replacement sheets, or
  • Refund the original purchase price of the affected sheets.

The value of the replacement reduces over time:

Time Since Purchase Material Replacement
Up to 5 years 100%
6th year 75%
7th year 60%
8th year 45%
9th year 30%
10th year 15%

Installation costs and any consequential losses are not included within the warranty.

Why Choose Marlon Polycarbonate?

At Omega Build we only supply Marlon ST and Marlon FS polycarbonate sheets because they are manufactured in the UK by Brett Martin and have a proven reputation for quality.

Benefits include:

  • 10-year manufacturer’s limited warranty
  • Double-sided UV protection
  • Excellent weather resistance
  • Outstanding impact resistance
  • Long-lasting optical clarity
  • High light transmission
  • Excellent fire performance
  • Premium UK manufacturing.

Frequently Asked Questions

Do polycarbonate roofing sheets come with a guarantee?

Yes. Premium Marlon ST multiwall and Marlon FS solid polycarbonate sheets supplied by Omega Build are backed by a 10-year manufacturer’s limited warranty, subject to the manufacturer’s terms and correct installation.

Does the warranty cover yellowing?

Yes. The warranty limits both yellowing and the reduction in light transmission over a 10-year period when the sheets are correctly installed and maintained.

Does the warranty cover storm damage?

The warranty covers breakage caused by normal weathering. Claims for hail damage are assessed against the manufacturer’s specified hail impact test.

Does incorrect installation affect the warranty?

Yes. Failure to install the sheets according to the manufacturer’s recommendations can invalidate the warranty.

Why should I choose branded polycarbonate sheets?

Branded products such as Marlon ST and Marlon FS are independently tested, UV protected and backed by a recognised manufacturer’s warranty, giving greater long-term confidence than many unbranded alternatives.

Final Thoughts

Not all polycarbonate roofing sheets are backed by the same level of manufacturer support.

Choosing premium Marlon ST multiwall polycarbonate sheets or Marlon FS solid polycarbonate sheets means you’re buying products that have been engineered for long-term outdoor performance and supported by a comprehensive 10-year manufacturer’s limited warranty.

At Omega Build, we only supply genuine Brett Martin polycarbonate sheets, so you can buy with confidence knowing you’re investing in a high-quality roofing solution that’s built to last.

Browse our ranges: