3003 W CASINO RD BLDG 40-56 2018-01-02 MF Import

`�\ �� A DALY August 30, 1979 A�CEIVED �AUG 3 1 1979 �cco�sr�.�. Boeing Engineering and _ _ Conetruction Company P. 0. Box 3707 . Seattle, Waehington 98124 Attention: K. L. Walker Mail Stop OH-03 Gentlemen: Sub�ec[: Building 40-56 Expanaion Smoke and Heat Curtain Boarde Everett� Waehington LAD Pro�ect No. 211778 To provide smoke and heat venting for the i0-56 Building, ruof and Wall vents have been provided in accordance with Section 3206 of the Uniform Building Code. The Code also requirea that the vented roof area be sub- divided into areas not larger than 50,000 equare feet using curtain boarde not iesa than 6 feet in depth nnd spaced not more than 250 feet on center. Aseuming that the 6-foot minim� depth required by the Code occurs at the eve line, and with a roof'elole of 1 inch in 24 inchea. the curtein at the ridge line vill be over 12 feet in depth. Thia eituatien will result in either a eevere restriction upon utilization of building epace, particularly with respect to overhead materlal handling equipment, or the curtain Loarde would require numerous large openings for paesage of material handling equipment. We propose that the building�e rigid frames be utilized as curtain boards. A closure would be provided above the rig3d framea between the roof pur- lins to close that epace. The result wauld be curtain boards of appzoxi- mately 5-foot minimum depth. In eome areas, the curtain depth would 'ue greater, depending upon the depth of the rigid frame. With xigid fremes occurring at 25-foot cen[ers, the eubdivided areas will be approximately 7,500 aq�are feet. pLAMJING/ARCHITECIURE/ENG WEERQJG tiROADCAST HOUSE, 7HIRD & BROAD ! SF.ATTI.E, WASHING7'ON 98121, USA TELEPHONE: 206 6821571 /CABLE: LADCO SEA SEATf1_E � OMAFiA � ST. I.UUIS ! SAN FRANCISCO I N'ASHINGIUN I� !LOS ANGELES i HONG KONG �SINGAPORF.i IAF:ARTA � BEIHIfT i.'�