How long does the ONDULINE guarantee last?

Guarantee depends on the product and is adapted to the climate where the product is intalled. You can find at the following address the warranty terms valid for your project: http://www.Onduline.com/en/Onduline-warranty 

(Worldwide) ONDULINE roofing sheets are guaranteed to remain weatherproof for 15 years under normal usage, when fixed and maintained according to fixing instructions 
(Turkey) ONDULINE HR is guaranteed 15 years. 
(Latin America) ONDULINE DUO DESIGN is guaranteed 15 years.
(Europe) ONDULINE EASYFIX is guaranteed 10 years. ONDULINE BASE and ONDULINE EASYLINE are guaranteed 5 years. 
(Asia) ONDULINE EASYLINE is guaranteed 15 years