One of the Onduline components is cellulose fiber. Cellulose fiber can be extracted from various sources, including wood pulp or recycled paper. Besides cellulose fiber, Onduline also consists of bitumen, resin, mineral additives. Cellulose fiber itself is a very strong material (also used in cement and concrete to improve resistance). Bitumen makes fiber water-resistant, pigments provide the coloration, resin and other additives improve weather-resistance.

Like all other bitumen-based materials, Onduline is flammable. In European Standards, its classification is E, which is “normal to ignite”. It is allowed for use on different types of buildings. But the cases when a source of fire is located on the roof are very rare. And if a house is on fire, it means that almost every type of roof cladding burns and melts.

Measurements show a thermal conductivity of 0,098 W/m.C°. This value is close to cork. By comparison, stainless steel value is 52 W/m.C°, 525 times higher. Onduline insulates from heat and cold, within these values.

Tests carried out at the Sound Research Laboratories Ltd (UK) show the good sound absorption of Onduline sheets with a value of Rw= 28 dB.
The noise of rain is absorbed much better on Onduline than on steel sheets.

Durability depends on external conditions like weather and climate. Onduline roofs are guaranteed waterproof for a 10-year period. However, some Onduline roofs have been installed for more than 50 years in Europe, and 30 years in tropical countries.

Because it is made of cellulose-bitumen saturated sheets, Onduline resists corrosion and most chemical products. (Laboratory tests carried out at CSTB – France)

Laboratory tests in USA and Germany and the long Onduline experience in Siberia (Russia) under the very low temperatures perfectly show that Onduline is absolutely frost-proof with no mechanical damage.

In a tropical endurance test, Onduline proved suitable in severe humidity and temperatures up to 70°C (Yarsley Test Centre – UK)

Tests carried out at the Yarsley Research Centre (UK) and in Miami and Metropolitan Dade County (USA) have proved Onduline suitable in hurricane and earthquake conditions (up to 192 km/h or 53,3m/s)

Onduline roofs are made of bitumen + resin + mineral pigments + cellulose fibers. None of this product is toxic for the people or the environment. Test carried out at Yarsley Technical Centre (UK) show no toxicity of Onduline sheets or ingredients.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Virtually everywhere! Onduline roofs cover homes, agricultural and industrial building all around the world with colors matching the environment.

Onduline has currently 9 factories around the world, with a 10th under construction. All factories are ISO9000 certified, which guaranties the same level of quality, wherever the production is made.

Onduline has been the first company to produce cellulose-bitumen sheets on an industrial scale. The company has been created in 1944 and has been constantly improving its products, and increasing sales. To date, Onduline Group is the #1 producer of cellulose-bitumen sheets worldwide.