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Dong Engineering Inc. <br />ADU <br />3414 S_TIMBER ST, SANTA ANA, CA 92707 <br />Job#: 250421 <br />Date: 9/17/2025 <br />PLAN: 1 <br />CODE: CBC 2022 <br />SECTION: 1Y <br />Number of Story: 1 Section width: 30.5(ft)Section length: 38.5(ft) <br />Base height: 0.75(ft)Slope roof height: 13.5(ft)Gable mean roof height: 11(ft) <br />WIND PARAMETERS PER ASCE7-16, CHAPTER 27, MWFRS BUILDINGS OF ALL HEIGHTS: <br />Wind speed = 110, Wind exposure = C, Wind importance factor Iw = 1 <br />Coefficients: Kd = 0.85, Kzt = 1, G = 0.85, Gcpi = +/-0.18, omega = 1 <br />B = 38(ft), L = 38.5(ft), H = 11.5(ft)-->L/B = 1.01, H/L = 0.3 <br />Wall coefficient: Cpw = 0.8, Cpl = -0.5 <br />Wind exposure = C-->anpha = 9.5, zg = 900 <br />Kz = 2.01*(15/zg)^(2/anpha)qz = 0.00256*Kz*Kzt*Kd*V^2*Iw P = G(Cpw*qz+Cpl*qh) <br />WIND LOAD: <br />SEISMIC PARAMETERS PER ASCE7-16, CHAPTER 12.8, ELF PROCEDURE: <br />Light frame wood-->Ry = 6.5, Site class :D, SDS = 2FaSs/3 =1.02, SD1 = 2FvS1/3 =0.59, <br />Seismic design category: D, I = 1, 0.7*V = 0.7*SDS*I*W/Ry = 0.7*1.02*1*W/6.5 = 0.1098*W <br />Total Seismic Load = 93.7 = 93.7 PLF <br />Redistrib: 853*8 = 6824 PLFxFT <br />DIAPHRAGM & CHORD FORCE PER ASCE07-16 SECTION 12.10 <br />ROOF DIAPHRAGM <br />Max shear = 141.37 x 30.5 / (2 x 38.5) = 56 PLF <br />Use: 15/32" apa rated unblock 32/16 w/8d common nails at 6", 6", 12" o.c. <br />Chord force = 141.37 x 30.5^2 / (8 x 38.5) = 426.98 LBS <br />Splice w/ min. (3) 16d sinker nails each side of splice at 8" o.c. (standard construction) <br />(z, Kz, qz, P): (15, 0.85, 22.35, 24.65) <br />ROOF <br />Roof = 18*38.5 = 693 PLF <br />Wall = 15*2*4 + 10*1*4 = 160 PLF <br />Shear = 0.1098(693+160) = 0.1098*853 = 93.66 PLF <br />Plate height: ROOF = 8(ft) <br />SHEAR ROOF = 93.7*853*8/6824 = 93.7 PLF <br />SHEAR ROOF = 0.6*W = 103.52(plf) <br />ROOF 103.52 PLF WIND GOVERN <br />8 of 32