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Document #524734 Rev G, Vol. 10 5 SunPower Proprietary <br />IInputs (ASCE 7-16): <br />The following tables list the allowable spacing of attachment points for the SunPower InvisiMount mounting <br />system. The following building codes and standards were used in the calculations: <br />x International Building Code (IBC 2018) <br />x International Residential Code (IRC 2018) <br />x Minimum Design Loads for Buildings and Other Structures (ASCE 7-16) <br />x Aluminum Design Manual (ADM1), 2015 <br />x National Design Specification (NDS) for Wood Construction, 2018 <br />The International Building Code is either adopted fully or mostly by each state. The accompanying Engineering <br />Certification Letter lists the building code for the state which this project. <br />Loads on the system were calculated in accordance with ASCE 7-16, using the following parameters: <br />x Risk Category II <br />x Dead Load: System weight (including PV modules and rails) = 2.7 psf <br />x Roof Live Load: 0psf – No live load acts on top of the PV modules <br />x Roof Snow Load Data: <br />o Ground snow load, pg, as indicated in the tables (Fig. 7-1) <br />o Thermal factor, Ct = 1.2, ‘unheated and open-air structures’ (Table 7.3-2) <br />o Exposure factor, Ce = 0.9, ‘fully exposed’ (Table 7.3-1) <br />o Slope factor, Cs, varies with slope and assumes the array is an ‘unobstructed slippery surface’ <br />where snow is free to slide off the array (Figure 7.4-1) <br />x Wind Design Data (Designed per Chapter 30, Components & Cladding): <br />o With modifications to GCp values per SEAOC PV2-2017 <br />o Basic Design Wind speed, V, and exposure category as indicated in the tables (Figure 26.5-1B) <br />o Roof height and slope as indicated in the tables (§26.2) <br />o Topographic factor, Kzt = 1.0 (Table 26.6-1) <br />o Directionality factor, Kd = 0.85 (Table 26.6-1) <br />o Velocity Coefficient, Kh = 2.01(z/zg)^(2/a) (as indicated in Table 26.10-1) <br />o Velocity Pressure Exposure Coefficient, Ke=1 (Table 26.9.1) <br />o Pressure coefficients, GCp, per either wind tunnel testing or Chapter 30 (see notes below tables) <br />x Earthquake Design Data (Designed per Chapter 13: Non-structural Components) <br />o Seismic Design Category E, Soil Site Class D assumed <br />o Mapped MCE Short Period, 0.2sec, Ss = 3.73g, maximum in the United States (Fig. 22-1) <br />o Mapped MCE Short Period, 1sec, S1 = 1.39g (Fig. 22-2) <br />o Importance Factor, Ip = 1.0 (§13.1.3) <br />o Amplification Factor, ap=1.0 (Table 13.6-1) <br />o Response Factor, Rp=1.5 (Table 13.6-1) <br />x Load combinations per IBC §1605, using Load and Resistance Factor Design (LRFD) <br />2105 N <br />St08/28/23