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N,,, JOB NO.: U2782.0762.201 <br /> ECTO R SUBJECT: GRAVITY LOADS <br /> E n G i n E E R s <br /> PROJECT: Christopher Casey Residence <br /> CALCULATE ESTIMATED GRAVITY LOADS <br /> Increase due to Original <br /> ROOF DEAD LOAD (D) pitch loading <br /> Roof Pitch/12 3.9 <br /> Composite Shingles 2.1 1.05 2.0 psf <br /> 1/2" Plywood 1.1 1.05 1.0 psf <br /> Framing 3.0 psf <br /> Insulation 0.0 psf <br /> 1/2" Gypsum Clg. 0.0 psf <br /> M, E & Misc 0.0 psf <br /> DL 6 psf <br /> PV Array DL 3 psf <br /> ROOF LIVE LOAD (Lr) <br /> Existing Design Roof Live Load [psf] 20 ASCE 7-10, Table 4-1 <br /> Roof Live Load With PV Array [psf] 0 WSBC, Section 1607.12.5 <br /> w/ Solar Panel <br /> SNOW LOAD (S): Existing Array <br /> Roof Slope [x:12]: 3.9 3.9 <br /> Roof Slope [°]: 18 18 <br /> Snow Ground Load, pg [psf]: 25 25 ASCE 7-10, Section 7.2 <br /> Terrain Category: C C ASCE 7-10, Table 7-2 <br /> Exposure of Roof: Fully Exposed Fully Exposed ASCE 7-10, Table 7-2 <br /> Exposure Factor, Ce: 0.9 0.9 ASCE 7-10, Table 7-2 <br /> Thermal Factor, Ct: 1.1 1.1 ASCE 7-10, Table 7-3 <br /> Risk Category: II II ASCE 7-10, Table 1.5-1 <br /> Importance Factor, Is: 1.0 1.0 ASCE 7-10, Table 1.5-2 <br /> Flat Roof Snow Load, pf [psf]: 17 17 ASCE 7-10, Equation 7.3-1 <br /> Minimum Roof Snow Load, pm [psf]: 0 0 ASCE 7-10, Section 7.3.4 <br /> Unobstructed Slippery Surface? No Yes ASCE 7-10, Section 7.4 <br /> Slope Factor Figure: Figure 7-2b Figure 7-2b ASCE 7-10, Section 7.4 <br /> Roof Slope Factor, Cs: 1.00 0.87 ASCE 7-10, Figure 7-2 <br /> Sloped Roof Snow Load, ps [psf]: 17 15 ASCE 7-10, Equation 7.4-1 <br /> Design Snow Load, S [psf]: 17 15 <br /> 1p 23 <br />