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LETTER - 18-00512 - 741 S 2275 W - Solar Panel
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͕>> W͘K͘Ždžϲϵϴϲ ƌŽŽŵĨŝĞůĚ͕KϴϬϬϮϭ ϱϯϬͲϴϲϰͲϳϬϱϱ ŽŵƵƐƐƚƌƵĐƚƵƌĂůΛŐŵĂŝů͘ĐŽŵ dŽ͗ ůƵĞZĂǀĞŶ^ŽůĂƌ ϭϮϮϬ^͘ϲϯϬ ͘^ƚĞ͘ϰϯϬ ŵĞƌŝĐĂŶ&ŽƌŬ͕hd͘ϴϰϬϬϯ ^ƵďũĞĐƚ͗ ĞƌƚŝĨŝĐĂƚŝŽŶ>ĞƚƚĞƌ ƌŽǁĞƌZĞƐŝĚĞŶĐĞ ϳϰϭ^͘ϮϮϳϱtĞƐƚ ZĞdžďƵƌŐ͕/͘ϴϯϰϰϬ dŽtŚŽŵ/ƚDĂLJŽŶĐĞƌŶ͕ ĞƐŝŐŶƌŝƚĞƌŝĂ͗ භ ƉƉůŝĐĂďůĞŽĚĞƐсϮϬϭϱ/ͬ/Z͕^ ϳͲϭϬ͕ĂŶĚE^ͲϭϮ භ ZŽŽĨĞĂĚ>ŽĂĚсϳƉƐĨ;DWϭͿ භ ZŽŽĨ>ŝǀĞ>ŽĂĚсϮϬƉƐĨ භ tŝŶĚ^ƉĞĞĚсϭϭϱŵƉŚ͕ džƉŽƐƵƌĞ͕ZŝƐŬĂƚĞŐŽƌLJ// භ භ ƚƚĂĐŚŵĞŶƚƐ͗;ϭͿϱͬϭϲΗĚŝĂůĂŐƐĐƌĞǁǁŝƚŚϮ͘ϱΗŵŝŶĞŵďĞĚŵĞŶƚĚĞƉƚŚ͕ĂƚƐƉĂĐŝŶŐƐŚŽǁŶĂďŽǀĞ͘ ^ŝŶĐĞƌĞůLJ͕ :ŽŚŶĂůǀĞƌƚ͕W͘ ͘ WƌŽũĞĐƚ ŶŐŝŶĞĞƌ dŚĞƐĐŽƉĞŽĨƚŚŝƐƌĞƉŽƌƚŝƐƐƚƌŝĐƚůLJůŝŵŝƚĞĚƚŽĂŶĞǀĂůƵĂƚŝŽŶŽĨƚŚĞĨĂƐƚĞŶĞƌĂƚƚĂĐŚŵĞŶƚ͕ƵŶĚĞƌůLJŝŶŐĨƌĂŵŝŶŐĂŶĚƐƵƉƉŽƌƚŝŶŐ ƐƚƌƵĐƚƵƌĞŽŶůLJ͘dŚĞĂƚƚĂĐŚŵĞŶƚΖƐƚŽƚŚĞĞdžŝƐƚŝŶŐƐƚƌƵĐƚƵƌĞĂƌĞƌĞƋƵŝƌĞĚƚŽďĞŝŶĂƐƚĂŐŐĞƌĞĚƉĂƚƚĞƌŶƚŽĞŶƐƵƌĞƉƌŽƉĞƌĚŝƐƚƌŝďƵƚŝŽŶ ŽĨůŽĂĚŝŶŐ͘ůůƉĂŶĞůƐ͕ƌĂĐŬŝŶŐĂŶĚŚĂƌĚǁĂƌĞƐŚĂůůďĞŝŶƐƚĂůůĞĚƉĞƌŵĂŶƵĨĂĐƚƵƌĞƌƐƉĞĐŝĨŝĐĂƚŝŽŶƐĂŶĚǁŝƚŚŝŶƐƉĞĐŝĨŝĞĚĚĞƐŝŐŶ ůŝŵŝƚĂƚŝŽŶƐ͘ůůǁĂƚĞƌƉƌŽŽĨŝŶŐƐŚĂůůďĞƉƌŽǀŝĚĞĚďLJƚŚĞŵĂŶƵĨĂĐƚƵƌĞƌ͘ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐĂƐƐƵŵĞƐŶŽƌĞƐƉŽŶƐŝďŝůŝƚLJĨŽƌ ŵŝƐƵƐĞŽƌŝŵƉƌŽƉĞƌŝŶƐƚĂůůĂƚŝŽŶŽĨƚŚĞƐŽůĂƌWsƉĂŶĞůƐŽƌƌĂĐŬŝŶŐ͘ WůĞĂƐĞĐŽŶƚĂĐƚŵĞǁŝƚŚĂŶLJĨƵƌƚŚĞƌƋƵĞƐƚŝŽŶƐŽƌĐŽŶĐĞƌŶƐƌĞŐĂƌĚŝŶŐƚŚŝƐƉƌŽũĞĐƚ͘ ^ĞƉƚĞŵďĞƌϭϭ͕ϮϬϭϴ dŚĞƌŽŽĨƐƚƌƵĐƚƵƌĞŽĨ;DWϭͿĐŽŶƐŝƐƚƐŽĨĐŽŵƉŽƐŝƚŝŽŶƐŚŝŶŐůĞŽŶƌŽŽĨƉůLJǁŽŽĚƚŚĂƚŝƐƐƵƉƉŽƌƚĞĚďLJƉƌĞͲŵĂŶƵĨĂĐƚƵƌĞĚƚƌƵƐƐĞƐƚŚĂƚ ĂƌĞƐƉĂĐĞĚĂƚΛϮϰΗŽ͘Đ͘͘dŚĞƚŽƉĐŚŽƌĚƐ͕ƐůŽƉĞĚĂƚϮϯĚĞŐƌĞĞƐ͕ĂƌĞϮdžϰƐĞĐƚŝŽŶƐ͕ƚŚĞďŽƚƚŽŵĐŚŽƌĚƐĂƌĞϮdžϰƐĞĐƚŝŽŶƐĂŶĚƚŚĞǁĞď ŵĞŵďĞƌƐĂƌĞϮdžϰƐĞĐƚŝŽŶƐ͘dŚĞƚƌƵƐƐŵĞŵďĞƌƐĂƌĞĐŽŶŶĞĐƚĞĚďLJƐƚĞĞůŐƵƐƐĞƚƉůĂƚĞƐ͘dŚĞŵĂdžƵŶƐƵƉƉŽƌƚĞĚƉƌŽũĞĐƚĞĚŚŽƌŝnjŽŶƚĂů ƚŽƉĐŚŽƌĚƐƉĂŶŝƐĂƉƉƌŽdžŝŵĂƚĞůLJϲΖͲϯΖΖ͘ dŚĞĞdžŝƐƚŝŶŐƌŽŽĨĨƌĂŵŝŶŐƐLJƐƚĞŵŽĨ;DWϭͿŝƐũƵĚŐĞĚƚŽďĞĂĚĞƋƵĂƚĞƚŽǁŝƚŚƐƚĂŶĚƚŚĞůŽĂĚŝŶŐŝŵƉŽƐĞĚďLJƚŚĞŝŶƐƚĂůůĂƚŝŽŶŽĨƚŚĞ ƐŽůĂƌƉĂŶĞůƐ͘EŽƌĞŝŶĨŽƌĐĞŵĞŶƚŝƐŶĞĐĞƐƐĂƌLJ͘ 'ƌŽƵŶĚ^ŶŽǁ>ŽĂĚсϱϬƉƐĨͲZŽŽĨ^ŶŽǁ>ŽĂĚсϯϱƉƐĨ dŚĞƐƉĂĐŝŶŐŽĨƚŚĞƐŽůĂƌƐƚĂŶĚŽĨĨƐƐŚŽƵůĚďĞŬĞƉƚĂƚϰϴΗŽ͘Đ͘ĨŽƌůĂŶĚƐĐĂƉĞĂŶĚϰϴΗŽ͘Đ͘ĨŽƌƉŽƌƚƌĂŝƚŽƌŝĞŶƚĂƚŝŽŶ͕ǁŝƚŚĂƐƚĂŐŐĞƌĞĚ ƉĂƚƚĞƌŶƚŽĞŶƐƵƌĞƉƌŽƉĞƌĚŝƐƚƌŝďƵƚŝŽŶŽĨůŽĂĚƐ͘ ũŽďƐŝƚĞŽďƐĞƌǀĂƚŝŽŶŽĨƚŚĞĐŽŶĚŝƚŝŽŶŽĨƚŚĞĞdžŝƐƚŝŶŐĨƌĂŵŝŶŐƐLJƐƚĞŵǁĂƐƉĞƌĨŽƌŵĞĚďLJĂŶĂƵĚŝƚƚĞĂŵŽĨůƵĞZĂǀĞŶ^ŽůĂƌĂƐĂ ƌĞƋƵĞƐƚĨƌŽŵŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͘ůůƌĞǀŝĞǁŝƐďĂƐĞĚŽŶƚŚĞƐĞŽďƐĞƌǀĂƚŝŽŶƐĂŶĚƚŚĞĚĞƐŝŐŶĐƌŝƚĞƌŝĂůŝƐƚĞĚďĞůŽǁĂŶĚ ŽŶůLJĚĞĞŵĞĚǀĂůŝĚŝĨƉƌŽǀŝĚĞĚŝŶĨŽƌŵĂƚŝŽŶŝƐƚƌƵĞĂŶĚĂĐĐƵƌĂƚĞ͘ KŶƚŚĞĂďŽǀĞƌĞĨĞƌĞŶĐĞĚƉƌŽũĞĐƚ͕ƚŚĞƌŽŽĨƐƚƌƵĐƚƵƌĂůĨƌĂŵŝŶŐŚĂƐďĞĞŶƌĞǀŝĞǁĞĚĨŽƌĂĚĚŝƚŝŽŶĂůůŽĂĚŝŶŐĚƵĞƚŽƚŚĞŝŶƐƚĂůůĂƚŝŽŶŽĨ ƚŚĞƐŽůĂƌWsĂĚĚŝƚŝŽŶƚŽƚŚĞƌŽŽĨ͘dŚĞƐƚƌƵĐƚƵƌĂůƌĞǀŝĞǁŽŶůLJĂƉƉůLJƐƚŽƚŚĞƐĞĐƚŝŽŶŽĨƚŚĞƌŽŽĨƚŚĂƚŝƐĚŝƌĞĐƚůLJƐƵƉƉŽƌƚŝŶŐƚŚĞƐŽůĂƌ WsƐLJƐƚĞŵĂŶĚŝƚƐƐƵƉƉŽƌƚŝŶŐĞůĞŵĞŶƚƐ͘dŚĞŽďƐĞƌǀĞĚƌŽŽĨĨƌĂŵŝŶŐŝƐĚĞƐĐƌŝďĞĚďĞůŽǁ͘/ĨĨŝĞůĚĐŽŶĚŝƚŝŽŶƐĚŝĨĨĞƌ͕ĐŽŶƚƌĂĐƚŽƌƚŽ ŶŽƚŝĨLJĞŶŐŝŶĞĞƌƉƌŝŽƌƚŽƐƚĂƌƚŝŶŐĐŽŶƐƚƌƵĐƚŝŽŶ͘ %URZHU5HVLGHQFH5H[EXUJ,' Digitally signed by John Calvert Date: 2018.09.11 15:14:03 -06'00' ͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺ ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͕>> W͘K͘Ždžϲϵϴϲ ƌŽŽŵĨŝĞůĚ͕KϴϬϬϮϭ ϱϯϬͲϴϲϰͲϳϬϱϱ ŽŵƵƐƐƚƌƵĐƚƵƌĂůΛŐŵĂŝů͘ĐŽŵ Address: 741 S. 2275 West, Rexburg, ID. 83440 Exposure: C Wind Speed: 115 mph Risk Category: II Aerial Image %URZHU5HVLGHQFH5H[EXUJ,' ͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺ ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͕>> W͘K͘Ždžϲϵϴϲ ƌŽŽŵĨŝĞůĚ͕KϴϬϬϮϭ ϱϯϬͲϴϲϰͲϳϬϱϱ ŽŵƵƐƐƚƌƵĐƚƵƌĂůΛŐŵĂŝů͘ĐŽŵ 50 psf (ASCE7 - Eq 7-1) 1 (ASCE7 - Table 7-2) 1 (ASCE7 - Table 7-3) 1 35.0 psf (ASCE7 - Eq 7-2) 1 35.0 psf 3.0 psf 4.00 ft 5.50 ft 22.00 sft 66 lb 4.00 2.00 0.73 0.00 (Ceiling Not Vaulted) 0.27 7.0 psf 7.6 psf PV Dead Load = 3 psf (Per Blue Raven Solar) DL Adjusted to 23 Degree Slope Point Loads of Standoffs Miscellaneous Vaulted Ceiling Total Roof DL (MP1) Roof Live Load = 20 psf Roof Plywood Roof Dead Load (MP1) Composition Shingle Note: Roof live load is removed in area's covered by PV array. Roof Snow Load Calculations pg = Ground Snow Load = Ce = Exposure Factor = pf = 0.7 Ce Ct I pg Ct = Thermal Factor = I = Importance Factor = Cs = Slope Factor = Standoff Tributary Area = ps = Cspf ps = Sloped Roof Snow Load = pf = Flat Roof Snow Load = *UDYLW\/RDGLQJ PV System Weight Weight of PV System (Per Blue Raven Solar) X Standoff Spacing = Y Standoff Spacing = Note: PV standoffs are staggered to ensure proper distribution of loading 2x4 Top Chords @ 24"o.c. %URZHU5HVLGHQFH5H[EXUJ,' BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͕>> W͘K͘Ždžϲϵϴϲ ƌŽŽŵĨŝĞůĚ͕KϴϬϬϮϭ ϱϯϬͲϴϲϰͲϳϬϱϱ ŽŵƵƐƐƚƌƵĐƚƵƌĂůΛŐŵĂŝů͘ĐŽŵ 115 mph C Gable/Hip 23 degrees 20 ft 19.3 ft (Eq. 30.3-1) 0.9 (Table 30.3-1) 1 (Fig. 26.8-1) 0.85 (Table 26.6-1) 115 mph (Fig. 26.5-1A) II (Table 1.5-1) qh = 25.90 15.54 Zone 1 Zone 2 Zone 3 Positive GCp = -0.86 -1.51 -2.37 0.42 (Fig. 30.4-1) Uplift Pressure = -13.40 psf -23.47 psf -36.86 psf 11.0 psf X Standoff Spacing = 4.00 4.00 2.67 Y Standoff Spacing = 5.50 2.75 2.75 Tributary Area = 22.00 11.00 7.33 Footing Uplift = -295 lb -258 lb -270 lb Zone 1 Zone 2 Zone 3 Positive GCp = -0.86 -1.51 -2.37 0.42 (Fig. 30.4-1) Uplift Pressure = -13.40 psf -23.47 psf -36.86 psf 10.0 psf (Minimum) X Standoff Spacing = 4.00 4.00 2.67 Y Standoff Spacing = 3.50 1.75 1.75 Tributary Area = 14.00 7.00 4.67 Footing Uplift = -188 lb -164 lb -172 lb -295 lb 450 lb Therefore, OK Fastener =1 - 5/16" dia Lag Number of Fasteners = 1 Embedment Depth = 2.5 Pullout Capacity Per Inch = 250 lb Fastener Capacity = 625 lb w/ F.S. of 1.5 & DOL of 1.6= 667 lb Therefore, OK Input Variables Wind Speed Effective Wind Area Design Wind Pressure Calculations Roof Shape Standoff Uplift Calculations-Portrait Mean Roof Height Roof Slope 667.2 lb capacity > 295 lb demand 0.6 * qh = Standoff Uplift Calculations-Landscape :LQG&DOFXODWLRQV Maximum Design Uplift = Standoff Uplift Capacity = 450 lb capacity > 295 lb demand Fastener Capacity Check Standoff Uplift Check Kz (Exposure Coefficient) = Kzt (topographic factor) = Kd (Wind Directionality Factor) = V (Design Wind Speed) = Risk Category = qh = 0.00256 * Kz * Kzt * Kd * V^2 Wind Pressure P = qh*G*Cn Exposure Category WĞƌ^ ϳͲϭϬŽŵƉŽŶĞŶƚƐĂŶĚůĂĚĚŝŶŐ %URZHU5HVLGHQFH5H[EXUJ,' ͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺͺ ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͕>> W͘K͘Ždžϲϵϴϲ ƌŽŽŵĨŝĞůĚ͕KϴϬϬϮϭ ϱϯϬͲϴϲϰͲϳϬϱϱ ŽŵƵƐƐƚƌƵĐƚƵƌĂůΛŐŵĂŝů͘ĐŽŵ Framing Information & Site Specific Pictures %URZHU5HVLGHQFH5H[EXUJ,' BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͕>> W͘K͘Ždžϲϵϴϲ ƌŽŽŵĨŝĞůĚ͕KϴϬϬϮϭ ϱϯϬͲϴϲϰͲϳϬϱϱ ŽŵƵƐƐƚƌƵĐƚƵƌĂůΛŐŵĂŝů͘ĐŽŵ 03 PASS Dead Load 7.6 psf PV Load 3.0 psf Snow Load 35.0 psf Governing Load Combo = DL + SL Total Load 45.6 psf Fb (psi) = f'b x Cd x Cf x Cr (NDS Table 4.3.1) 900 x 1.15 x 1.5 x 1.15 Allowed Bending Stress = 1785.3 psi (wL^2) / 8 = 445.3567 ft# = 5344.28 in# Actual Bending Stress = (Maximum Moment) / S = 1745.1 psi L/180 (E = 1600000 psi Per NDS) = 0.416 in Deflection Criteria Based on = (w*L^4) / (185*E*I) = = L/494 > L/180 Therefore OK Allowed Deflection (Live Load) =L/240 0.312 in (w*L^4) / (185*E*I) L/642 > L/240 Therefore OK Member Area = Fv (psi) = 180 psi (NDS Table 4A) Allowed Shear = Fv * A = Max Shear (V) = w * L / 2 = 285 lb Check Bending Stress Continuous Span 0.152 in 0.117 in Member Properties Member Size 2x4 S (in^3) 3.06 DF#2 Member Spacing @ 24"o.c. Maximum Moment = Check Deflection I (in^4) 5.36 Lumber Sp/Gr Actual Deflection (Live Load) = Allowed Deflection (Total Load) = Actual Deflection (Total Load) = Allowed > Actual -- 97.8% Stressed -- Therefore, OK 945 lb Allowed > Actual -- 30.2% Stressed -- Therefore, OK (True Dimensions) 5.3 in^2 Check Shear w = 91 plf 2x4 Top Chords @ 24"o.c. Member Span = 6' - 3" )UDPLQJ&KHFN %URZHU5HVLGHQFH5H[EXUJ,' BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB B ŽŵƵƐ^ƚƌƵĐƚƵƌĂů ŶŐŝŶĞĞƌŝŶŐ͕>> W͘K͘Ždžϲϵϴϲ ƌŽŽŵĨŝĞůĚ͕KϴϬϬϮϭ ϱϯϬͲϴϲϰͲϳϬϱϱ ŽŵƵƐƐƚƌƵĐƚƵƌĂůΛŐŵĂŝů͘ĐŽŵ Level Area Weight (psf) Weight (lb) Roof 1900 sf 7.6 psf 14449 lb Ceiling 1900 sf 6.0 psf 11400 lb Wood Siding 100 ft 5.0 psf 2000 lb (8'-0" Wall Height) Int. Walls 100 ft 6.4 psf 2560 lb 30409 lb 3.0 psf 193 sf 579 lb 3041 lb 579 lb 1.9% /DWHUDO&KHFN 3041 lb > 579 lb, Therefore OK 3HU,%&&KDSWHU Existing Weight of Effected Building Existing Weight of Effected Building Proposed Weight of PV System Weight of PV System (Per Blue Raven Solar) Approx. Area of Proposed PV System Approximate Total Weight of PV System 10% Comparison 10% of Existing Building Weight (Allowed) Approximate Weight of PV System (Actual) Percent Increase %URZHU5HVLGHQFH5H[EXUJ,'