Faq
- Which way up is an Onduline sheet fixed?
- Can I install Onduline roof sheets flat?
- How long is BARDOLINE guaranteed for?
- Where can I find Onduline installation instructions?
- 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?
- Can I install I install Onduline sheets upside down?
- How do I replace a shed roof with Onduline sheets?
- Can I install Onduline sheets on top of the existing shed felt?
- Can I install Onduline roofing sheets directly onto timber boards?
- What should my roof pitch be to install Onduline?
- Can condensation form beneath an Onduline roof?
- How many fixings do I need per Onduline sheet?
- Is watertighness and waterproofing also warrantied for low pitched roofs?
- Do Onduline roofing sheets need ventilation?
- Can I install ONDULINE CLASSIC as a fence?
- Do I need a breathable membrane under Onduline roofing?
- How do you cut an Onduvilla tile?
- Measuring your roof pitch
- Do Onduline roofing sheets sag in hot weather?
- Identifying problems with your roof structure
- Are Onduline roofing sheets better than felt roofing for a shed?
- What is the condition of my roof structure?
- How do you fix the Onduline ridges?
- What structure is my roof?
- How to fix Onduline Verges and Edges
- Measuring purlin or timber batten spacing / distance
- Fixing Eaves
- Where to fix Onduline accessories
- Fixing the Hip Detail
- What tools are needed for installing Onduline sheets?
- How to Fix the Eaves Trays
- What’s the difference between Onduline roofing and metal roofing?
- Fixing an Eaves Ventilation Strip
- What is the weight of an Onduline sheet?
- Can you fix Onduline to a curved Roof?
- Are Onduline sheets resistant to mould and mildew?
- How can I cut an Onduline sheet?
- Can Onduline sheets replace corrugated metal roofing?
Can I install Onduline sheets on top of the existing shed felt?
Not always. ONDULINE® roofing sheets can often be installed over an existing roof covering, such as roofing felt or shingles, without removing it first. The existing roof products should be in good condition. If it is torn, worn out or leaking, it is better to remove it before installing the new sheets.
Top Tip! Installing ONDUTISS AIR breathable membrane on top of the solid roof deck before laying the sheets can help to enhance the roofs ventilation.
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