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Interlock®, Interlock Lifetime Roofing Systems®, Alunar®, Interlock Arrow Sign®, Best Roof®, and Never Re-Roof Again.® are registered trademarks of I.E.L. Manufacturing Ltd. and are used under license. Cannot be combined with any other promotional offers or discounts. Offer valid for this promotion only and cannot be applied to previous purchases. Discounts vary based on the size and location of your home. A minimum purchase of 12 squares is required. Purchase of an Interlock Lifetime Roofing System is necessary to qualify. Available only at the time of purchase. Offer not valid if the contract is canceled or amended. † On approved credit. Offer available only in Nova Scotia, Prince Edward Island, and New Brunswick, Canada. Contact a Customer Account Specialist for details. Offer expires .