Letter # EW-FL-VRT-2MIL Exterior wall, vertical with metallic 2 mil SS foil Construction Specialties, Inc. 6696 State Route 405, PO Box 380 Muncy, Pennsylvania (570) 546-5941 Fax: (570) 546-8022 www.c-sgroup.com
January 14, 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: Stainless steel foil cover over fire barrier behind exterior wall EJC
Mr. Pridemore, In reference to the above mentioned project it has come to our attention that the use of stainless steel foil has come into question on the attached detail. Referenced in this detail is UL assembly WW-D-1085 that outlines the requirement to have a cover plate over the fire barrier material, see section 2.C. The intent of the listing is to have stainless steel foil noted as an alternative to the solid metallic covers that are shown in the picture. For example when we have a condition where a gasket type cover is used, the stainless steel foil is used between the fire barrier and gasketed cover to satisfy the UL listing. Similarly in the attached detail the stainless steel is used in between the fire barrier and exterior cover. It is our opinion that the condition detailed herein follows the intent of the UL listing and that the fire rated assembly will perform up to its listed rating. 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)
FIRE BARRIER FLANGE 2 MIL SS FOIL METALLIC COVER FOR UL DESIGN (REF. 2.8)
6" OFX-6W 2 HR FIRE BARRIER UL# WW-D-1085
FIRE BARRIER FLANGE
FOR 8" MFX IN 6" JOINT SS FOIL METALIC COVER TO SATISFY UL DESIGN
T-105 OVERLAPS WRB 3" FROM JOINT