Green Coroline sheets are 2.6mm Thick / Onduline is 3.0mm Thick - this is the only difference! Material Uses Sheds Garages Stables Agricultural Buildings Key Properties A tough lightweight corrugated roofing material manufactured from bitumen saturated organic fibres available in four aesthetically pleasing colours: black, red, green and brown. Economical and resilient: tough and long lasting Environmentally friendly: free from asbestos and non-toxic, a 'green' roofing option Coroline is resistant to environmental factors such as most aggressive vapours i.e ideal for animal houses Waterproof: guaranteed waterproof for 15 years* Strong yet light in weight Simple to handle and install Compatible with most commercially available construction materials Good workability: simple to fix using nails, caps and washers Excellent heat insulation Good sound absorption COROLINE Thermal Properties U Value W2K 4.4 *Coroline MUST be fixed and maintained in accordance with the manufacturer's instructions for the warranty to remain valid. Re-erections or consequential damage costs are not included.  The Coroline range by Ariel comes with a 15 Year Guarantee.