Division 7 Ebook Page 529 FOAMULARŪ XPS Insulation ASHRAE 90.1 Prescriptive Roof Insulation Requirements

Technical Bulletin FOAMULAR Extruded Polystyrene (XPS) Insulation ASHRAE 90.1 Prescriptive Roof Insulation Requirements OWENS CORNING FOAM INSULATION, LLC ONE OWENS CORNING PARKWAY TOLEDO, OHIO 43659 1-800-GET-PINK www.owenscorning.com Pub. No. 10015707-B. Printed in U.S.A. September 2014. THE PINK PANTHER & 1964-2014 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. 2014 Owens Corning. All Rights Reserved. Disclaimer of Liability Technical information contained herein is furnished without charge or obligation and is given and accepted at recipient's sole risk. Because conditions of use may vary and are beyond our control, Owens Corning makes no representation about, and is not responsible or liable for the accuracy or reliability of data associated with particular uses of any product described herein. Nothing contained in this bulletin shall be considered a recommendation. building envelope trade-off options, or the Energy Cost Budget Method with variations on the compliance paths. The paths include prescriptive minimum R-values, maximum U-factors, and the conducting of actual thermal testing on assemblies. The IgCC and ASHRAE 189.1 are not as widely adopted, but some architects/owners choose to design to their goals of greater sustainability. Prescriptive Thermal Performance for Roof Decks The table "Prescriptive R (minimum) Requirements for Roofs with Insulation Entirely Above Deck" charts R by climate zone for commercial low slope roofs as listed in ASHRAE 90.1, the IECC, and ASHRAE 189.1 when used as an alternate to the IgCC. Because the edition adopted varies by jurisdiction, several 90.1 editions are summarized, including 2004, 2007, 2010 and 2013. The IECC-2012, and ASHRAE 189.1-2011 are also summarized. The table shows only the prescriptive requirements for "non-residential" (commercial) and "residential" (as defined by ASHRAE 90.1) buildings. This table applies to buildings that are heated and/or cooled. The standards also provide prescriptive insulation values for "semi-heated" buildings that are not shown in this table. This technical bulletin does not provide complete design requirements. See the applicable standard for complete building performance and design compliance requirements. Prescribed insulation levels are based on the concept of achieving "optimum insulation", which is defined as the "lowest life-cycle cost" (LLC) amount of insulation calculated at the time that particular version of the Standard was adopted. (For more information, see the Owens Corning data sheet that explains LLC. at www.owenscorning.com) Volatility in energy costs and ever-rising construction costs generally cause the LLC amount of insulation to trend upward. Therefore, specifiers should consider exceeding today's minimum standards based on the expected life of the building and long term economic return on the investment in insulation. The ASHRAE 90.1 criteria for roof insulation installed entirely above the roof deck is: 1) it is installed above (outside of) the roof structure and, 2) it is continuous (i.e., uninterrupted by framing members.) References 1. ASHRAE Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings; American Society of Heating, Refrigerating and Air- Conditioning Engineers, Inc.; 1791 Tullie Circle NE, Atlanta, GA 30329 2. International Energy Conservation Code; International Code Council, Inc.; 4051 West Flossmoor Road, Country Club Hills, IL 60478-5795 3. International Green Construction Code; International Code Council, Inc.; 4051 West Flossmoor Road, Country Club Hills, IL 60478-5795 4. ASHRAE 189.1, Standard for the Design of High- Performance Green Buildings; American Society of Heating, Refrigerating and Air- Conditioning Engineers, Inc.; 1791 Tullie Circle NE, Atlanta, GA 30329

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