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9924 Universal Boulevard #224­406 Orlando, FL 32819 Tel:1.310.464.1804 <br /> Email: loydwmartin@gmail.com www.loydwmartin.com <br />Loyd W. Martin Professional Engineer, Inc. <br />Check attachment of Support to Existing Structure for Wind Uplift ­ Cont'd <br />where: <br />Y = Distance between 2 lag screws <br />X = 1.2" <br />Y' = Moment arm to 1st lag screw <br />X = 5.6" <br />Design (Factored) Load at each support: <br /> 3 psf + (0.6 x 29.7 psf) = 20.8 psf <br />Moment due to Load = (20.8 psf x 11 sq. ft.) x 5.6 inches <br />Determine allowable load per 5/16" lag screw w/ 3.25" embedment into wood below <br />according to the 2018 NDS. <br />W ' = W x Cd x Ct Table 10.3.1 2018 NDS <br />where: <br />W = 266 lbs / in. of embedment per Table 12.2a <br />Cd = 1.6 per Table 2.3.2 of 2018 NDS <br />Ct = 1.0 per Table 10.3.4 of 2018 NDS <br />W ' = 266 lbs/ in. x 3.25 in. x 1.6 x 1.0 = 1,383 lbs > 1,280 lbs OK <br />OK. Use Tile Hooks with (2) 5/16" x 3.5" Lag Screws <br />with 3.25" min. embedment into wood, at 48" O.C. <br />max, as per Plans to Manufacturer's instructions. <br />Moment due to Load = 1,281 in-lb <br />Load to lag screw = 1,281 in-lb / 1.2 in <br />Load to lag screw = 1,280 lbs <br />Exp. 3-31-19 <br />No. C58724 NITRAMW.DYO <br />REGISTEREDPROFESSIONALENGINEER <br />C <br />V <br />L <br />FOETATS <br />ALIFORNIAICIL <br />-23 <br />YY' <br />AG <br />Exp. 3-31-19 <br />No. C58724 NITRAMW.DYO <br />REGISTEREDPROFESSIONALENGINEER <br />C <br />V <br />L <br />FOETATS <br />ALIFORNIAICIL <br />­215 <br />2321 W St Anne Pl - <br />201824535/23/2024