• How long does the Onduline guarantee last?
• Which way up should an Onduline sheet be fastened?
• Do you sell clear transparent sheets that slot in with Onduline sheets?
• Is Onduline fireproof?
• How can I find my local supplier?
• What is the overhang required for Onduline sheets?
• What is the minimum roof pitch for Onduline sheets?
• Do you supply Onduline in different lengths?
• How many nails should I use per Onduline sheet?
• How can I cut an Onduline sheet?
• What is the difference between Onduline Classic and Onduline BASE, Easyfix, Easyline?
• What is the difference between Onduline and Coroline?
• What is the difference between Onduline and Ondutile?
• How long are Onduvilla tiles guaranteed for? 
• Are Onduvilla tiles fireproof? 
• What are Onduvilla tiles made from? 
• What colours are Onduvilla tiles available in? 
• What is the size of Onduvilla tiles? 
• What is the minimum pitch for Onduvilla tiles? 
• Do you supply Onduvilla tiles in different lengths? 
• How many nails should I use per Onduvilla tile?
• What is the overhang required for Onduvilla tiles
• How do you cut an Onduvilla tile?
• Can I walk on an Onduline or Onduvilla roof?
• What kind of fixing, screw or nail can I use?
• How many sheets are needed to cover a roof?
• What kind of structure do I need for a Onduline or Onduvilla roof?
• Where can I find Onduline installation instructions?
• Can I paint an Onduline or Onduvilla roof?
• Can an Onduline roof resist to hail?
• What is Onduline's thermal performance?
• Are Onduline products sold directly to end users?
• Where can I find the Installation Guide?
• What is the price range of Onduline products?
• What is the ridge angle?
•  What is the maximum spacing between battens?
• Is it possible to use ONDUCLAIR lightning systems as a roof covering and cladding?
• What is the difference between light transmission and lightning?
• What is the difference between single-skin and double-skin?
• What is the maximum recommended span for ONDUCLAIR products?
• What does transparent, crystal and Opal mean?
• What is the difference between illumination and lighting?
• What does polyester, PVC and polycarbonate mean?
• Can you use the illumination on the front and on the cover?
• What is the difference between Reaction to fire and external fire resistance?
• Why should the roof be ventilated?
• How should I maintain the roof?
• What are some tips to properly install Bardoline Shingles?
• Does Onduline or Onduvilla crack and corrode in hot and cold weathers?
• Does Onduline or Onduvilla change colour?
• How can ONDUVILLA be installed on wood batten?
• How can I install a gutter to an Onduline or Onduvilla roof?
• What is the difference between a bituminous membrane and a breathing membrane?