Bitumen roofing products are manufactured in a continuous process starting with large rolls of organic felt on to which other components are layered. The felt is passed through a saturator tank where it is impregnated with the hot bitumen. This is then coated with a stabilizer to the top and bottom of the saturated felt sheet. Coloured granules are then dropped onto the top surface, while a talc is spread across the back to prevent the shingles from sticking together when packaged. Cooling rollers then press the granules firmly into the hot bitumen while bringing the temperature of the material down. The material is then accurately cut to size, packaged and wrapped for shipment. From bold new shades to suit modern architecture to ‘natural’ hues to complement more traditional styles, Citadel shingles are ideal for chalets, sheds, outhouses and mobile homes as well as conventional dwellings.
www.cembrit.co.uk/roofing/shingles/bitumen-shingles/