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  1. Home
  2. FAQ
  3. Installation
  4. Why should the roof be ventilated?
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  • Where can I find Onduline installation instructions?
  • Where can I find the Installation Guide?
  • What is the ridge angle?
  •  What is the maximum spacing between battens?
  • Which way up should an Onduline sheet be fastened?
  • What is the maximum recommended span for ONDUCLAIR products?
  • What is the overhang required for Onduline sheets?
  • Why should the roof be ventilated?
  • What is the minimum roof pitch for Onduline sheets?
  • What are some tips to properly install Bardoline Shingles?
  • How many nails should I use per Onduline sheet?
  • How can ONDUVILLA be installed on wood batten?
  • How can I cut an Onduline sheet?
  • How can I install a gutter to an Onduline or Onduvilla roof?
  • What is the minimum pitch for Onduvilla tiles? 
  • How many nails should I use per Onduvilla tile?
  • What is the overhang required for Onduvilla tiles
  • How do you cut an Onduvilla tile?
  • 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?

Why should the roof be ventilated?

It's essential to keep an air flow under the roof as there is a natural concentration of humidity below the roof.

Have you found your answer?

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