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Daniel W. Dunzik Architect LEED-AP <br /> 370 Burnt Hill Rd.Skillman NJ.08558 908-872-3664 <br /> StudioGdesign@comcast.net February 24,2021 <br /> Gravity Load Calculation Criteria <br /> Structural Design Loads per ASCE 7-16 <br /> Dead Loads= 10 psf+2.6 psf(new solar panels)= 12.6 psf <br /> Roof Live Load=20 psf <br /> Ground Snow Load/Live Load=0 psf <br /> Wind Load Calculation Criteria <br /> Wind Loads per ASCE 7-16,Ch.30 method 1 <br /> Using an area of 10 SF,wind loads from Figure 30.5-1: <br /> Zone 1 =-36.5 psf Roof Slope=27 degrees Roof Mean Height= 15 ft <br /> Zone 2=-47.4 psf Basic Wind Speed= 140 mph <br /> Zone 3=-54.7 psf Exposure=B <br /> Per section 2.4.1,ASD combo=D+0.6W: <br /> Zone 1 =2.6 psf+0.6(-36.5 psf)_-19.3 psf <br /> Zone 2=2.6 psf+0.6(-47.4 psf)_-25.8 psf <br /> Zone 3=2.6 psf+0.6(-54.7 psf)_-30.2 psf <br /> Check Attachment to Wood Truss <br /> Use 5116 dia.Lag screw w/3"embedment into 2 in.wide roof rafter <br /> Lag Screw Spacing: Lag Screw Tributary Area: <br /> Zone 1 = 48"o.c.max Zone 1=(48"o.c.max)^2/144= 16 SF <br /> Zone 2= 32"o.c.max Zone 2=(32"o.c.max)^2/144=7.11 SF <br /> Zone 3= 32"o.c.max Zone 3=(32"o.c.max)^2/144=7.11 SF <br /> Lag Screw Forces: W=266lb/in(Table 12.2A,2015 NDS) <br /> Zone 1 =19.3 psf x 16 SF=309 lb < W', OK Cd= 1.6(Table 2.3.2,2015 NDS) <br /> Zone 2=25.8 psf x 7.11 SF= 183 lb < W', OK Ct=1 (Table 2.3.3,2015 NDS) <br /> Zone 3=30.2 psf x 7.11 SF=215 lb < W', OK W'=W x embed x Cd x Ct <br /> W'=266 lb/in x 3 in.xl.6 x 1 = 1276.8 lb <br />