Letter # CLG-Shaft-P146 Ceiling joint at Rm -P146; garage storage Construction Specialties, Inc. 6696 State Route 405, PO Box 380 Muncy, Pennsylvania (570) 546-5941 Fax: (570) 546-8022 www.c-sgroup.com
January 27, 2016 Spectrum Specialty Builders Attn: Dan Pridemore 3902 West Valley Hwy North, Suite 500 Auburn, WA 98001 Project: Lincoln Square II
Location: Bellevue, WA
C/S Project #156859 Re: Wall fire barrier in a ceiling shaft wall construction
Mr. Pridemore, It is our understanding that the above project requires fire protection at an expansion joint in a ceiling shaft wall application. The ceiling is constructed as a gypsum board shaft wall assembly. C/S has not tested any fire barrier in a ceiling construction application. The current building codes and applicable testing standards (ASTM E1966 and UL 2079) do not presently provide testing criteria for rated ceiling applications. C/S cannot provide an “engineering judgment� because there is no test data on this configuration on which to base a judgment. The C/S MFX product proposed (see the following listing, UL WW-D-2011) has been tested and proven to provide 2-hour rating performance in gypsum board, 2-hour applications. With the MFX installed from below the ceiling up into the joint and covered on the underside with 2-mil s/s foil or other metal cover, the tested configuration is maintained. It is my opinion that the proposed C/S MFX product, in the configuration, will perform as well as the adjacent construction. However, final acceptance of this application will be the responsibility of the authorities having jurisdiction. If additional information is required, please feel free to contact us. Sincerely,
Justin Moon Product Development Specialist Expansion Joint Cover Systems P: 570-546-4602 E: jmoon@c-sgroup.com Encl Cc: file, Pam Weihermuller (C/S)