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CUSTOM DESIGN & ENGINEERING, INC <br /> STRUCTURAL ANALYSIS & DESIGN <br /> RESPONSE LETTER <br /> Date: September 30, 2015 <br /> Reference project: PLAN CHECK No: CW1507-005 <br /> 1. The existing floor joists will be reinforced with an additional 2 x 6, stitched together with 16d <br /> nails @ 6" o.c x 2 staggered rows. Minimum edge distance for the nailing shall be 1.5" from <br /> the edges of the 2 x 6's. Excessive deflection has been addressed w/the owner and they <br /> concur. <br /> Check 16 ft joists <br /> Per ASCE Table 4-1, Residential sleeping areas = 30 psf <br /> Floor dead load = 10 psf (2 x 6 framing, gwb, etc) <br /> Dead load w, = 40 psf x 16/12 = 53.33 Ib/ft <br /> Max moment wL2/8 = 53.33(16)2/8 = 1707 ft-Ib <br /> � MO O <br /> c�o <br /> Shear = wL/2 = 53.33(16)/2 = 426.6 <br /> Double 2 x 6, Sx = 15.13 in �o 36,923 <br /> Area = 16.5 int SS ORAL <br /> ovn L <br /> fb = 1707(12)/15.13 = 1354 psi <br /> fv = 1.5(426.6/16.5) = 38 psi (LOW) <br /> Existing 2 x 6 are old grown lumber which have excess of 1500 psi <br /> New 2 x 6 DF 1, allowable stress is per below: <br /> 11006 60TH AVE WEST- MUKILTEO WA 98275 <br /> PHONE (425) 343-7517- FAX (425) 493-8388 <br />