Division 7 Ebook Page 262 Recover Roofing Overview

Section Overview Recover Roofing Insulated Roof Systems Recover Single-Ply Roofing Systems When an existing BUR reaches the end of its service life and it must be replaced, a decision must be made to either: 1) completely remove the existing BUR/insulation and replace it with another system or 2) "recover" the existing BUR with a new FOAMULAR DURAPINK extruded polystyrene (XPS) insulation layer and single-ply membrane roofing system. The first option, total tear off, requires the cost of time and labor to remove the old system, haul and dispose of the waste in a landfill, and completely replace the system with new insulation/membrane from the deck up. The second option, "recover," salvages the existing system and its insulation layers by placing a new layer of insulation and membrane on top of the existing BUR, avoiding the time, labor and landfill costs required to dispose of a torn off system. Recover systems save time and money by avoiding tear off and landfill costs, while salvaging the useful R-value of existing insulation layers by keeping them on the roof. However, not every roof is a candidate for recover. Before choosing recover, it must be verified that the existing roof deck is structurally sound, and that the existing insulation layers are dry, or capable of drying after recover roofing is complete. Recover roofing systems are typically factory produced single-ply roofing membranes that provide strength, flexibility, durability and installation speed. They are usually mechanically attached to avoid additional weight on the existing structure from ballast or cover boards in fully adhered systems. FOAMULAR DURAPINK XPS Rigid Insulation FOAMULAR DURAPINK XPS is a perfect insulation choice for recover single-ply roofing systems. Unlike wood fiberboard often used for recover, DURAPINK XPS insulation has high resistance to water absorption, maintaining all of its insulation and strength properties while any latent water that may be in the old system dissipates. DURAPINK recover insulation systems have a wide variety of Underwriters Laboratories (UL) and Factory Mutual (FM) performance ratings for fire and wind resistance including ASTM E108 Class A, and wind uplift resistance classifications. Sustainability Owens Corning is committed to driving sustainability through greening our operations, greening our products and accelerating energy efficiency in the built environment. Owens Corning FOAMULAR XPS products are GREENGUARD Indoor Air Quality Certified and GREENGUARD Children and Schools Certified SM . FOAMULAR XPS is also third party certified to contain a minimum 20 percent recycled polystyrene content and is produced with a zero ozone depletion blowing agent formulation. FOAMULAR XPS insulation products contribute to achieving credits in multiple LEED categories including energy efficiency and recycled material content and carry a lifetime limited warranty 1 on all ASTM C578 physical properties for true long lasting value. Notes 1. See actual warranty for complete details, limitations and requirements. Recover Roof Insulation INSULATION

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