NDL Warranty

NDL Warranty

How NDL Warranties Work Unlike most roof warranties, an NDL warranty is not simply issued when a project is complete. The system must first be installed by a contractor approved by the manufacturer, and the roof must be installed to meet the manufacturer’s...
Pull Test

Pull Test

Why Are Pull Tests Performed Pull tests are commonly performed on low-slope commercial roofs before installing a mechanically attached roof system over a metal deck. The deck’s gauge, age, and condition directly affect how well fasteners hold, and that holding...