3000 ROCKEFELLER AVE ADMIN BLDG WEST 2022-05-13

• May 23, 2018 Mr.Tony Lee Snohomish County Courthouse Renovation/Addition ge 2) The air barrier and the testing requirements of the barrier noted in Section C402.5.1.2 should be shown on the plans. Response:Air barrier testing has been added to section "3.5 Field Quality Control"in spec section 072726 "Fluid-Applied Membrane Air Barriers". Spec section 072726 has been attached to this letter. This testing requirement has also been included on Sheet GI-103. STRUCTURAL 1) The structural design is currently under review. Calculations for the project have only recently been received. The review will continue with any comments forwarded under separate letter. Response:Comment acknowledged. 2) The addition is shown to have been designed as a seismic risk category II building. Please discuss why the building is not a risk category III structure [the building has a primary • occupancy is public assembly and the overall building(addition plus existing) has an occupant load exceeding 5000]. Table 1604.5 Response: The occupant load for the building is only 2,932 occupants, therefore the occupant load of 5,000 would not apply. Likewise, IBC Table 1604.5 states that this table applies to "buildings and other structures with a primary occupancy that is public assembly with an occupant load greater than 300."The IBC code commentary explains that a method of determining if the primary occupancy is assembly would be by"verifying that the portion of the building housing the public assembly occupancy is more than 50 percent of the total building area."For this project, the areas of public assembly amount to only 27%of the total building area. Therefore, in accordance with the code commentary mentioned above, the primary occupancy is not assembly and Table 1604.5 is not applicable in this instance. *** End of Comments*** •