Roofing Services ON — Professional Installation, Warranty, and Financing Roofing Services Interlock Industries (Ont) Inc., has a long and proud tradition of offering homeowners trend-setting, elegant, and environmentally sustainable roofing services and solutions. Our roofing products are designed and tested to be attractive, durable, and last a lifetime. When you choose Interlock Roofing, the first time you replace your roof will also be the last. Share on facebook Share on google Share on twitter Share on linkedin Installation Although it may look easy, installing a roof is actually a pretty complicated job. And to ensure the safety and effectiveness of your installation, it’s important that your installers are experienced professionals. Financing Financing available o.a.c., easy credit terms with flexible payment schedules and at a competitive rate, you will make the best decision for your family. Lifetime Limited Warranty All Interlock Metal Roofing Systems are backed by an exclusive lifetime limited Non Prorated and 50 yr transferable roof warranty.