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HomeMy WebLinkAboutFIRE CODE MEMO - 18-00569 - Porter RV Storage Southfork Design Group LLC, 1066 N. Yellowstone Hwy., Rexburg, ID 83440, 208-852-6236 Memorandum DATE: 8/5/19 TO: Quinton Owens FROM: Val Christensen, Code Professional Ray McDougal, P.E. SUBJECT: Porter Storage Units, 2nd East, Rexburg 2015 IBC Firewall Code Analysis MEMO: Evaluation is based on S1 occupancy. Building labeling below corresponds to buildings on the civil site plan as A through D moving north to south. Building A. 62-12’ by 40’ units = 29,760 sq. ft. The building is open on three sides From IBC Section 506.3.3, W=30 F=820 P=1560 I=(820/1560-0.25)(30/30) I=0.276 or the area increase due to frontage. From IBC Table 506.2, S1 allowable area = 9000 sq. ft. 9000*1.276= 11,484 sq. ft. allowable. Two firewalls located to provide three areas that do not exceed 11,484 sq. ft. each are required. Building B. 60-10’ by 30’ units = 18,000 sq. ft. The building is open on four sides From IBC Section 506.3.3, W=30 F&P are the same so they equal 1 when divided. I=(1-0.25)(30/30) I=0.75 or the area increase due to frontage. From IBC Table 506.2, S1 allowable area = 9000 sq. ft. 9000*1.75= 15,7850 sq. ft. allowable. Section 903.2.9 allows a maximum of 12,000 sq. ft. in each area without a sprinkler system. One firewall situated close to the center of the building is required. Building C. 50-12’ by 40’ units = 24,000 sq. ft. The building is open on four sides From IBC Section 506.3.3, W=30 F&P are the same so they equal 1 when divided. I=(1-0.25)(30/30) I=0.75 or the area increase due to frontage. From IBC Table 506.2, S1 allowable area = 9000 sq. ft. 9000*1.75= 15,7850 sq. ft. allowable. Section 903.2.9 allows a maximum of 12,000 sq. ft. in each area without a sprinkler system. One firewall situated at the center of the building is required. Southfork Design Group LLC, 1066 N. Yellowstone Hwy., Rexburg, ID 83440, 208-852-6236 Building D. 49-12’ by 40’ units = 23,520 sq. ft. The building is open on three sides From IBC Section 506.3.3, W=30 F=668 P=1256 I=(668/1256-0.25)(30/30) I=0.282 or the area increase due to frontage. From IBC Table 506.2, S1 allowable area = 9000 sq. ft. 9000*1.282= 11,538 sq. ft. allowable. One firewall situated at the center of the building is required if one unit is removed. Otherwise, two firewalls are required.