Interlock Metal Roofing — Maritimes  © 2018 The Interlock Group. Interlock®, Interlock Lifetime Roofing Systems®, Alunar® are registered trademarks of I.E.L. Manufacturing Ltd. and are used under license. Teflon™ is a trademark of THE CHEMOURS COMPANY FC, LLC used under license by Interlock Roofing Ltd.