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thir INTUITIVE f IRE Intuitive Engineering Services, LLC Project: Blue Gate 3 Hangar Date: 3/24/2023 Referenced Codes 2019 Oregon Structural Specialty Code (OSSC) and Standards: 2016 NFPA 13 Standard for the Installation of Sprinkler Systems Alternate Request: Equivalent Strategy to achieve a 2-Hour Wall Rating 1 ALTERNATE OVERVIEW The Blue Gate 3 Hangar (BG3H) is located less than 30 ft from both the north property line and the east property line. The associated exterior walls are therefore required to have a 2-hour fire- resistance rating. This alternate request serves to provide an equivalent strategy utilizing closely- spaced sprinklers for fire protection in lieu of the 2-hour fire-resistance rating required. 2 BUILDING OVERVIEW The Blue Gate 3 Hangar (BG3H) is a new building being constructed at the Aurora Airport in 4151, Aurora, Oregon. It is under the jurisdictional review of Marion County. The proposed design is one story of Type II-B construction and the total fire area is 17,920 sf. The building is constructed of metal framing/siding and serves as a storage and maintenance hangar for aircraft as a Group S-1 occupancy, but contains no major maintenance requiring open flame, welding, or doping. The building is designed to be fully sprinklered per NFPA 13. 3 CODE REQUIREMENT/ REASON FOR ALTERNATE Under OSSC Section 412.3. Aircraft hangars, Section 412.3.1 states: "Exterior walls located less than 30 feet from lot lines or a public way shall have a fire-resistance rating not less than 2 hours." At the BG3H building, the north wall is located —15 ft from the north property line and the east wall is located —26 ft from the east property line. While the north property line fronts a separate property, the east property line fronts a public way. The distance to the centerline of the street is —65 ft, with no structures, trees, or significant fuel load between the building and the public way to the centerline of the street. II