- Which way up is an Onduline sheet fixed?
- How to Fix the Eaves Trays
- How long is BARDOLINE guaranteed for?
- Fixing an Eaves Ventilation Strip
- Where can I find Onduline installation instructions?
- Can you fix Onduline to a curved Roof?
- How many nails should I user per Onduline sheet?
- Can you drill a hole in the sheets to install a flue?
- What is the minimum pitch for Onduvilla tiles?
- How do you cut an Onduvilla tile?
- Can you install a roof light window into Onduline?
- 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?
- Can you stand on the classic sheets if the roof under them is solid?
- Can I install Onduline roof sheets flat?
- Can you install Onduline sheets on a Pent Shed?
- Is Onduline Fire Resistant?
- Can I install Onduline sheets on top of the existing shed felt?
- How do you fix the Onduline ridges?
- How can I cut an Onduline sheet?
- How to fix Onduline Verges and Edges
- Fixing Eaves
- Fixing the Hip Detail
- Can I use Onduline bitumen sheets for cladding?
Can I install I install Onduline sheets upside down?
No, definitely not. The underside does not have any UV protection, has less bitumen saturation and also the side laps will not seal properly, as they finish incorrectly.
The topside of the roof sheet is sprayed with a resin which helps to combat UV degradation. The colouring is a natural pigment, which is impregnated into the sheet, prior to the bitumen dip. This process ensures an equal colouring and means the colour cannot peel from the sheet.
The underside of the roof sheet has a rippled finish. This increases the surface area, enabling it to combat condensation. It will hold the moisture for as long as it can, until the airflow dissipates the liquid, by turning it back into vapour.
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