Division 7 Ebook Page 87 Enclosure Solutions FAQ

ENCLOSURE SOLUTIONS FAQs 8 29. What if, on my project, I have no spandrel area to insulate and install a perimeter fire containment system? In other words, I have floor to ceiling vision glass. A: Unfortunately there are no tested systems per ASTM E 2307 that allow for zero protected spandrel area. Although the exterior curtain wall is a non-rated element, we have data through testing here in the United States and also test data published from the United Kingdom's Loss Prevention Council that an all glass exterior curtain wall with mineral wool Safing Insulation installed only between the vision glass on the exterior curtain wall will not provide the protection necessary to keep fire from spreading at the perimeter joint. When Safing is installed between the face of the floor slab and vision glass the glass will break out and the Safing will only stay in place for approximately 10 minutes into the fire test. When the glass is compromised, the Safing Insulation falls out as soon as the glass breaks. Therefore this method of protection does not meet code requirements. The IBC Building Code, Section 715.4 "Exterior curtain wall/floor intersection" requires the interior joint between the face of a fire-resistance-rated floor assembly and a non-rated exterior curtain wall assembly to be sealed with an approved "system" to prevent the interior spread of fire. Such systems shall be securely installed and tested in accordance with ASTM E2307 to provide an F rating for a time period not less than the fire- resistance rating of the floor assembly." All "approved" tested and listed perimeter fire containment systems require a minimum height of curtain wall spandrel protection with mineral wool insulation (per the system design criteria) so that the spandrel stays in place during the fire. Again, conditions with all vision glass at the exterior curtain wall/floor intersection will not meet the building code requirements. 30. Why are backer/reinforcement members required in perimeter fire containment systems? A: Backer/reinforcement members are required to maintain a tight seal created in the void when the safing is compression-fit from 25-30% between the slab edge and the vertical insulation. The force that the compressed safing creates will cause the spandrel insulation to bow, losing the integrity of the seal and creating an area where fire can breach through the void. There are several different types of backer/reinforcement members. The key is that they have to be constructed from a minimum of 20 ga galvanized steel. There are tested designs that incorporate hat channels, T-Bars and steel angles. You will need to refer to the tested assembly to see which applies. There are newer systems that do not require a backer/reinforcement member. One such system is where the horizontal window sill transom is located at a distance of no greater than 3" above the floor line. The location of this horizontal transom, in conjunction with Thermafiber Impasse Horizontal Hangers, provides the support necessary to keep the spandrel insulation from bowing. Therefore, when using these particular systems, a backer/reinforcement member is not required. Other systems incorporate an additional layer of insulation to support the safing insulation and provide the required reinforcement at the safing void. For these specific assemblies, go to Underwriters Laboratories Online Fire Resistance Directory at http://www.ul.com/. 31. What if there are no tested or listed perimeter fire containment systems that match my project's design? A: See question #5. The Owens Corning Enclosure Solutions Concrete Masonry Unit (CMU) Wall System excludes the masonry veneer and concrete masonry units. A detailed list of the components is available at OwensCorning.com/enclosure. Pub. No. 10020903 Printed in U.S.A. May 2016. THE PINK PANTHER & 1964-2016 Metro-Goldwyn-Mayer Studios Inc. All Rights Reserved. The color PINK is a registered trademark of Owens Corning. 2016 Owens Corning. All Rights Reserved. Thermafiber, Inc. All Rights Reserved. Trademarks are the properties of their respective owners. OWENS CORNING INSULATING SYSTEMS, LLC ONE OWENS CORNING PARKWAY TOLEDO, OHIO, USA 43659 1-800-438-7465 1-800-GET-PINK owenscorning.com/enclosure

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