Division 7 Ebook Page 531 THERMAPINK® XPS Insulation in Architectural Metal Roof Covering Systems

Technical Bulletin Architectural Metal Roof Covering Systems THERMAPINK Extruded Polystyrene (XPS) Insulation Owens Corning THERMAPINK extruded polystyrene (XPS) insulation (unfaced) is well suited for use in architectural metal roof covering systems. It offers outstanding properties such as high water resistance, light weight and durability, all of which make construction scheduling easier. THERMAPINK insulation has long lasting insulation R-value that saves money for the building owner. It provides design flexibility with a variety of thicknesses, dimensional stability, high compressive strength and third party listings for fire performance. THERMAPINK insulation is manufactured to comply with ASTM C578, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation. 1) LEED Certification and Reusability THERMAPINK insulation durability and moisture resistance enables it to be reused in many commercial roofing and re- roofing applications. The ability to be reused saves money when the time comes to reroof, with THERMAPINK XPS insulation in the roof. THERMAPINK insulation is made with recycle content that is verified by an independent, third party agency, and contributes to attaining points for LEED certification. The current recycle content certificate is available at www.owenscorningcommercial. com. Reusability also makes THERMAPINK insulation an environmentally friendly choice. Specifying products that are reusable is one of the fundamental concepts of sustainable building design. THERMAPINK insulation is also GREENGUARD Indoor Air Quality Certified and GREENGUARD Children & Schools Certified SM , is produced with a zero ozone depletion blowing agent formulation, and carries a lifetime limited warranty 1 on all physical properties. A copy of the Lifetime Limited Warranty is available at www. owenscorningcommercial.com. 2) Service Temperatures: The maximum service temperature for THERMAPINK insulation is 165F. To maintain acceptable temperatures in service, it is recommended that the metal panel mounting system maintain a minimum 3 /8" air gap between the underside of the metal panel and the THERMAPINK insulation surface or any underlayment membrane. The exterior surface temperature of the metal panel should not exceed 200F. The gap is not required when a protective cover board is used. Black underlayment, self-adhering membrane, may be placed directly over THERMAPINK insulation provided the membrane is chemically compatible with XPS. Black underlayment placed over THERMAPINK insulation must be covered with metal panel roof covering as soon as possible to avoid potential damage to the XPS due to sun related heat absorption in the black membrane. 3) Moisture and Vapor Resistance: Low Water Absorption THERMAPINK insulation, in total immersion, has a maximum water absorption rate of 0.3 volume percent. That is as much as 10 times less than alternate insulation products such as EPS or polyisocyanurate. Roof insulation is likely to be exposed to water during construction, or from leaks during the life of the building, or from water vapor migration from the building interior to the exterior. Testing by the U.S. Army Corps of Engineers, Cold Regions Research Laboratory has shown that moisture susceptible insulations retain only 40 percent of their insulating value after only 300 days of laboratory wetting. THERMAPINK insulation under the same conditions retains greater than 90 percent of its insulating value after 300 days, and greater than 80 percent after 700 days. Vapor Retarders The need for and placement of vapor retarders is an important design consideration in roofing assemblies. Depending on design conditions, THERMAPINK insulation may be considered to be a vapor retarder. Depending on conditions, an additional retarding layer may need to be added. THERMAPINK insulation permeance ranges from 1.1 perm for a 1" thickness to 0.6 perm for a 3" thickness.

Previous Page
Next Page