Fequently Asked Questions

Onduline recommends:

- Ventilate the roof: keep an air flow under the roof as there is a natural concentration of humidity below the roof


- Take care of the minimum recommended slope to facilitate the water run-off

              - ONDUCLAIR® Ribbed: 7%

              - ONDUVILLA®, ONDULINE®,

              - BARDOLINE®: 20%

              - ONDUCLAIR®:  25% (PO & Greca)


- Use the appropriate quantity of fixing to ensure a better resistance to wrenching

            - ONDULINE®: 10 fixations / m² 

            - ONDUVILLA® : 16 fixations /m²

            - BARDOLINE® : 50 clous au m²


- Maintain regularly your roof for a better durability: remove vegetation and leaf debris, take care of evacuations, accessories and structure, and maintain continuous ventilation.


General questions

What warranty offers Onduline ?

In normal installation and usage conditions, Onduline product warranty is:


- ONDUVILLA ®  & ONDULINE ®: 15 year Waterproof


- ONDUCLAIR ®: light transmission and impact resistance

           - PVC : 2 years (PVC SG 0,8mm)

           - PLR & PC : 10 years


What are the fixations used with Onduline solutions ?

- Wood support: wood screw with pressure washer, saddle support, sealing  washer (sketch)

- Metal support: Self-drilling screw with pressure washer, saddle support, sealing  washer

- On concrete: (wall) plug + screw with pressure washer, saddle support, sealing washer


What is the time needed to install Onduline solutions? (estimated time for 1 person installing on a standard and simple surface)

 - ONDULINE ® : 9m²/hr

 - BARDOLINE ®: 5m²/hr  – 1ml/hr for ridges and valleys.

 - ONDUVILLA ® : 7m²/hr (including components)


Specific questions per products



What are the tips to know to ensure proper installation?

 - Plan 15% sheets more for the ridge and the starter row (that has to be installed upside down, see installation guidelines), 50 nails / m² and a 1 BARDOFIX ® glue cartridge for 6m².



Does it crack and corrupt in hot and cold weathers?

ONDUVILLA ® tiles may be applied both in the most cold and most hot and humid climates easily. No problems have been encountered in applications made in areas where the temperature was +50°C under shadow and in regions where the cold was almost -50°C.


Does its color change?

ONDUVILLA® is affected slightly by UV. However, due to the coloring process, this change is not felt and it preserves its color for many years.


What is the minimum pitch?

The minimum pitch is 15%, with the use of a full deck or 30% for a batten structure.


What are the tips to prepare the installation?

A pack of 7 tiles covers a useful surface of 2.17m².

Nails are not included in the pack. About 13 nails are needed per m², so 1 bag of 50 nails for each pack of ONDUVILLA®.


How can ONDUVILLA® be installed on wood batten?

In that case, the maximum width distance between purlins is 32cm.


How to install a gutter an ONDUVILLA® roof?

A gutter can be installed, provided it is not fixed on the tiles, but on the structure.





What is the difference between a bituminous membrane and a breathing membrane?

 - A bituminous membrane has to be ventilated on each side (above/below).

 - A breathing membrane can be directly installed on the insulation and ventilated on the upper side.


ONDUCLAIR ® Plastic range

What is a single-skin sheet?

- It’s a sheet composed of a single thin wall.

What is the difference between Transparent, Cristal and Opal?

 - Transparent: one can see the shape, not the colour

 - Cristal: one can see shape and colour

 - Opal: one can’t see shape nor colour

What are the classes for Polyester (PLR)?



Min glass fibre/m²

Average thickness (mm)

Do-it-yourself work

Class 1


0.8 (+/- 0.09)

Wall cladding

Class 2


1.0 (+ 0. 14/- 0.10)

Roof / Cladding

Class 3


1.3 (+/- 0.14)

Roof / Cladding

Class 4


1.7 (+/- 0.25)


What is the fire performance?

- Polyester (PLR): M4

- PVC: M1

- Polycarbonate (PC): Euroclass B-s1, d0


What is the light transmission?

 - Polyester (PLR): 80%

 - PVC Cristal: 85%

 - PVC Opal: 65%

 - Polycarbonate (PC) Cristal: 90%

 - Polycarbonate (PC) Opal: 66%

What are the installation rules (maximum purlin distance, overlapping and fixing)?

 - The maximum purlin distance is 1.50m.
 - Overlapping:




Higher corrugations

Smaller corrugations

Side overlap

1 corrugation

½ corrugation

1 corrugation

End overlap

150 mm




 - To avoid the plastic deformation when anchoring, set up a distance spacer between the support and the sheet at the anchoring point.