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Wyssling Consulting <br />76 N. Meadowbrook Drive <br />Alpine, UT 84004 <br />(201) 874-3483 <br />swyssling@wysslingconsulting.com <br />Existing Wiggs Residence <br />Roof Dead Load 3701 South Sycamore Street <br />2.0 psf Composite Shingle Santa Ana, CA <br />1.6 psf 1/2" Plywood Sheathing <br />4.0 psf 2x4 Trusses @ 24 in. o.c. <br />1.0 psf Ceiling, Mechanical, Electrical <br />0.3 psf Miscellaneous <br />8.9 psf TOTAL <br />Second Floor Dead Load <br />0 psf Floor Finishes <br />0 psf 1 1/8" Subfloor Sheathing <br />0 psf Joists @ 16' o.c. <br />0 psf Partitions <br />0 psf Ceiling, Mechanical, Electrical <br />0 psf Miscellaneous <br />0 psf TOTAL <br />Roof Live Load Floor Live Load <br />20 psf 0 psf <br />Roof Snow Load <br />Ground SnowLoad= 0 psf (to be divided by cosine of roof angle for horizontal projection ASCE 7 Sec. 7.4) <br />pf = 0.7 Ce Ct I pg = 0 psf Ce = 1, Ct = 1.1 Flat Roof Snow Load (ASCE 7-16 Eq. 7.3-1) <br />Cs = 0.93 ASCE 7-16 Figure 7.4-1 <br />Additional <br />Roof Dead Load - New Solar Panels <br />3 psf <br />Roof Live Load at Solar Panels <br />0 psf <br />Roof Snow Load at Solar Panels <br />0 psf Sloped Roof Snow Load (ASCE 7-16 Eq. 7.4-1) <br />Total <br />Total Existing Roof Load = (DLROOF + Max(LLROOF or S)) AreaROOF <br />69158 lbs <br />Total New Roof Load = (DLROOF + DLADD + Max(LLROOF or S)) AreaROOF <br />65885 lbs <br />Change in Demand = (Total New Roof Load - Existing Roof Load) / Existing Roof Load <br />-4.73% <br />2021 IEBC Section 805.2 states: <br />"Any existing gravity load-carrying structural element for which an alteration causes an increase in design gravity load <br />of more than 5 percent shall be strengthened, supplemented, replaced or otherwise altered as needed to carry the <br />increased gravity load required by this code for new structures." <br />Gravity Loads <br />Total New Gravity Loads are less than Existing Loads. OK <br />1/25/2023 <br />3701 S Sycamore <br />St - 2017983607/17/23