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Design Load (Gravity Load)Lee & Lee Structural Engineering Inc. <br />Vertical Load <br />Roof psf Live load reduction CBC 2022 Section 1607A.12.1 <br />DL General <br />Asphalt Shingle 2.5 L = L 0 (0.25 + 15/(K LL *A T )1/2 )EQ. 16A-7 <br />Sheathing 2.0 where, <br />Framing 3.3 L = reduced design live load <br />Ceiling 1.7 L0 = unreduced design live load(Table 4-1) <br />Insulation 1.0 KLL = live load element factor(Table 4-2) <br />Drywall 2.7 AT = tributary area <br />MISC 1.8 <br />15.0 KLL*AT > 400 ft2 <br />Solar panel add 7.0 <br />LL Roof live load 20.0 Reduction in roof <br />20.0 L r = L 0 R 1 R 2 EQ. 16A.10 <br />where, <br />Attic psf R1 =1 for At ≤ 200 ft2 <br />DL 1.2 - 0.001 At for 200 ft2 <At < 600 ft2 <br />Framing 3.3 0.6 for At ≥ 600 ft2 <br />T BAR 3.0 R2 =1 for F ≤ 4 <br />Insulation 1.0 1.2 - 0.05 F for 4 < F < 12 <br />7.3 0.6 for F ≥ 12 <br />F=number of inches of rise per ft <br />LL Attic (Storage) live load 20.0 Minimum roof live load shall be 12psf <br />CBC 2022, Table 1607A.12.1 <br />2nd Floor Table 4-2 Live load element factor, KLL <br />DL Element KLL <br />Flooring 6.0 Interior columns 4 <br />Sheathing 1.9 Exterior columns without cantilever slabs 4 <br />Framing 4.0 Edge columns with cantilever slabs 3 <br />Ceiling 5.0 Corner columns with cantilever slabs 2 <br />Insulation 1.0 Edge beams without cantilever slabs 2 <br />MISC 2.1 Interior beams 2 <br />20.0 All other members not identified 1 <br />including <br />LL Floor live load CBC 1607.5 80.0 Edge beams with cantilever slabs <br />Corridors above first floor 80.0 <br />Stair 100.0 <br />*ABBREVIATION <br />DL Dead Load <br />LL Live Load <br />Exterior Wall 20.0 <br />Interior Wall 10.0 CBC 2022 Table 1607.1 <br />CBC 2022 Section 1607.22.2 <br />Uninhabitable attic over 42" CLR <br />LL=20psf <br />Gravity Load <br />4 of 81 <br />210 W 19th St <br />4/14/2025