3003 W CASINO RD BLDG 40-23 2018-01-02 MF Import

Ms. Sharon Culbertson 2 October, 1996 Page 2 5. A variance was granted by the City of Everett, as part of the 1990 High -Bay Factory Expansion, which allowed the construction of a fifth level provided the following conditions were met. a) The fifth level area falls within the allowable area for mezzanines. b) All levels have exit stair enclosures with two hour fire -rated walls for their full height. c) All stairs exit to a pedestrian tunnel. d) All travel distances are within the 200 foot travel distance limit. e) All levels arc sprinklered and have standpipes with hose connections. Smoke detectors are provided at each elevator door. The current expansion has been designed on the basis that the terms and conditions of this variance are still in effect. 6. When existing stairs, designed under previous editions of UBC, will be extended to provide exiting from additional floor levels, the new portions of the stairs are designed to meet the 1994 UBC. Where there is a difference in tread and riser dimensions between the new and old Flights, a single flight that is steeper than the new flights but not as steep as the old flights will be added to act as a transition between the new and old flights. Stair towers will he two-hour fire -rated for their full height. New stair tower walls are designed using a two-hour rated shaftwall system. Where required, existing stair tower walls will be upgraded to meet a two-hour fire -rating. All stair tower doors, new and existing, are 90 minute rated. Existing stair tower walls are constructed of 3/4" cold - rolled channels at 16" o.c. with metal lath and 3/4" plaster cover on both sides for a total plaster thickness of 2-1/4". The closest two-hour U.L. rated system we could find to this is U.L. Design No. U413 (attached), which shows the same framing as our existing walls, but shows 2-1/2" total plaster thickness. We require acceptance, by The City of Everett, of the 2-1/4" system in lieu of the 2- 1/2" system. This impacts approximately twelve existing stair towers in the current High -Bay Factory Office Build -Out project. 8. The Washington Administrative Code provides an exception, for buildings where quick -response sprinklers are provided, to the requirement for areas of refuge in stairways. UBC, however, provides an exception for fully sprinklered buildings, to the requirement for areas of refuge. According to Steve Miller of the City of Everett, in a conversation on 8-28-96, the City of Everett follows the UBC on this issue and does not require areas of refuge in fully sprinklered buildings. However, out of Boeing corporate liability concerns, quick -response sprinkler heads will be provided on the new floor levels. 9. The Washington State Amendments to the UBC reduce the number of water closets to below the U13C requirements. According to Steve Miller of the City of Everett, in a conversation on 8-28-96, the City of Everett follows the Washington State Amendments on this issue and does not require the full number of fixtures specified by the UBC. The rr 1" A5