Very tough, shatter resistant GRP will withstand harsh weather conditions. Features Excellent fire resistant meeting BS476 "Fire Tests" Parts 3 and 7. In built UV light stabilisers ensures the product does not become brittle over in hot and cold weather conditions. Not subject to thermal movement. Superior surface protection enhances its ability to withstand extreme weather conditions. Opaque grey finish giving the look of traditional materials (lead), but unlike lead it has no salvage value making it anti-theft proof. Exceptional durability lasting in excess of 30 years. Inherent robust and resilience makes it maintenance free. Easy to use being light in weight and pliable, and easy to cut and fix requiring. No special equipment. Built in mortar grips ensure good mortar bond between valley and tile.