1. Is it necessary to fix each sheet with 20 nails?
Yes, it is necessary. The roofing material installation can then be weather-proof for a very long period of time. Furthermore, it will also withstand extreme weather conditions, e.g. storms. The 1998 summer hurricane in Moscow tore off Onduline sheets fastened with 4-6 nails. Sheets fastened with 20 nails have remained undamaged.
2. Is it mandatory to use Onduline Safe Top nails?
Safe Top nails have been specifically designed for Onduline roofs. The Safe Top bonded washer is resistant to UV radiations and with its weatherproof seal provides a superior resistance to wind uplift. Safe Top are particularly suitable for use on hardwood purlins, and their colors match the Onduline sheet colors. Other nails can be used, but with no Onduline guarantee.
3. Does Onduline color fade?
Like everything else under the sunshine, Onduline color will gradually becomes paler. This is due to UV action. Onduline fades gradually and evenly, while the low quality metal sheets can lose color sporadically.
4. Does Onduline provide other accessories?
Onduline provides ridge pieces which are manufactured from the same material and to the same high specifications as Onduline sheets. Flexible double wing accommodates a wide range of roof angles. Ridges are available in the same colors and finish than the sheets.
5. What is the maximum roof pitch? And the minimum?
Onduline roofs can be installed from pitches as low as 5°, up to 90°. Our Technical Department can provide all the necessary information for specific installations.
6. How much snow load can Onduline bear?
If the battens and overlapping are made correctly Onduline withstands snow load up to 960 kg/m², which is equivalent to one single layer of 50cm snow. However, we highly recommend contacting our technical department for installation in extreme climatic conditions.
7. Is it necessary to clean snow from Onduline roof?
If the roof construction is made correctly, there will be no problem with snow laying upon it. If one cleans it constantly, roof could be damaged. Therefore it is better not to do it.
8. Is it necessary to use under-roofing with Onduline?
It is not necessary if you want just to improve the water-tightness. Onduline roof system is absolutely water-tight. However, it is necessary to use a vapor barrier in the roof construction.
9. What is the guarantee of my Onduline roof?
Onduline guarantees the waterproofing of its products for 10 years. Product has to be installed according to specifications. Guarantee is limited to the exchange of product only.
10. Can I walk on an Onduline roof?
Like any other roof, Onduline is not made to be walked on. So you must follow the usual safety procedures when going on an Onduline roof.
11. What is the maintenance of an Onduline roof?
Maintenance is minimal. You must just ensure that no leaves remain on the roof and trap humidity. This has to be done for gutters anyway.
12. Steel roofs experience expansion/contraction issues. Is this the same with Onduline?
While steel expands and contracts under the action of heat and cold, Onduline dimensional stability is not affected. Test carried out at the French National Testing Laboratory.
13. Can I install Onduline on a metal frame? On concrete or wood decking?
Yes. Onduline can be installed on metal frame or on decking. The fixing must then be adapted and our Technical Department has ready procedures about this.
14. Can I paint an Onduline roof?
Onduline roofs come pre-pigmented and sometimes also pre-painted from the factory. It is perfectly possible to paint and repaint Onduline sheets, on both sides. Oil based paint with solvents should be avoided at all times. Please contact our Technical Department for getting the procedure.
15. There are stains on the sheets. How to remove them?
Stains are made of bitumen drop and are normal. They will be washed away with rain after a while. Should you want to remove them immediately, just rub another piece of Onduline material against it.
