GAF Announces Groundbreaking Lifetime Limited Warranty On All Of Its Laminated Roofing Shingles Homeowners To Benefit From Multiple Decades Increase In Warranted Performance* WAYNE, NJ (1/2011) – GAF, North America’s largest roofing and ventilation manufacturer, is announcing groundbreaking changes to its laminated shingle warranties.  Effective January 1, 2011, every GAF laminated shingle, including all Timberline®shingles—the #1-selling [...]