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HomeMy WebLinkAboutAPPLICATION - 17-00714 - 965 Westwood Dr - Solar Panels©F��xeURt Building Safe Department C1TY ar g ty p 7�REXBURG City of Rexburg 35 North 1st East AmericasFarniiy orrurrnnily Rexburg, Idaho 83440 BUILDING APPLICATION Miscellaneous Electrical Work For Office Use Permit Number: Permit Type; Electrical Only 1. Property finer Name: __Lr i°' i6t i 1 Address: C LO b SUP ui lam' rY City: Yr' State: �,� Zip Code: U Phone: (ri�.� i Email. 2. Electrical Can tractor Business: State License #: 0 1-79 1 6 Exp_; Address:_6 Z 0 P—I 'City: CA &6 Lt ,C_kC State: ID Zip Cade: -432-09 Phone. _2.09- Z 3 357-2 Email: 1e4_, 'SSC (& beL-idog S ct. ijt P. 1-0 L) Contact/Rep. Name: I ssct 4V Phone: '6 DC7- mail: 5 Electrical Contractor Authorized Signature: Date: - i t h d i? 3. Project Description a Address: c-1 � I,u�'S � ;(= ( -OR- Lot#: —L -t" Block#: 3 Subdivision: eyr� ' r,111f I%li What type of Property�Residential O Commercial n Multi -Family Residential Description of work: liq o - lYi c, , 1+ 4. Fees Central Heating/Cooling Systems = $65 O Irrigation Machine = $65 for center pivot + $10 per tower or drive motor $ ® Pumps -Water, Irrigation, Sewage (per motor) = O $65 -up to 25HP 0 $95 - 26- 200HP o $130 - aver 200HP © requested Trip/Inspection = $65 0 Spas, Hot Tubs, and Swimming Pools = $65 El Technical Service = $65/hour a Temporary Amusement = $65 + $10 per ride, concession, or generator $ Temporary Electrical Services ONLY = $65 (200 amp or less. One location, for less than 1 year.) New Circuits = $(65 + ($10 x # of branch circuits)) $ APPLICANT'S SICNATURE,CERTIFICATION AND AUTHORIZATION: Under penalty of perjury, I hereby certify that I have read this application and state that the Information herein Is correct and i swear that any Information which may hereafter be given by me In hearings before the Pla nning and Zoning Commission or the City Council for the City of Rexburg shall be truthful and correct I agree to comply with all City regulations and State laws relating to the subject matter of this application and hereby authorized representatives of the City to enter upon the above-mentioned property for Inspections purposes. NOTE: The building official may revoke a permit on approval Issued under the provisions ofthe 2012 International Cade in cases of any false statement or misrepresentation of fact in the application or on the plans on which the permit or approval was based. Perralt void If not started within 188 days. Permit void if work stops for 180 days. Applicant's Name (print): i ' n v° i Signa Date: f Inspections must be called In before 8 AM on the day the Ins pectlen is requested. inspection requests called in after 0 A M will be scheduled for the next business day. Inspection Hotline -(208)372,2344 www.rexburg.org Permit Technician -(2081372.2341 RpvlePAM.—h 7n7r, Tt E 1—I S I n 1= E R 5 f` VSE Project Number. U2456-0052-171 October 2, 2017 Skyline ATTENTION; Pierson Watts 309 E. State Road American Fork, UT 84003 REFERENCE: Craig Nordfelt Residence: 965 Westwood Drive, Rexburg, ID 83440 Solar Array Installation To Whore It May Concern: We have reviewed the site plans and photgraphs provided by Skyline relating to the installation of the solar array at the above -referenced site. Based upon our review, it is our conclusion that the installation of the solar array on this existing roof will not adversely affect this structure. It is our understanding that the structural components of the existing roof framing are in good condition and free of damage. The design of the solar panel racking (mounts, rails, e(c.) is by the manufacturer or contractor. Please note a representative of Vector Structural Engineering has not physically observed the roof framing. Design Parameters Code: International Building Code, 2012 Edition Risk Category; II Design wind speed: 115 mph (3 -sec gust) per ASCE 7-10 Wind exposure category: C Ground snow load: 50 psf Design snow load on roof: 35 psf Existing Roof tructure Roof structure- 2x40 manufactured trusses @ 24" O.C. Roofing material: composite shingles Roof slope: 17° Connection to Roof Mounting connection: (t) 5116" lag screw w/ min, 2.5" embedment into framing at max. 48" O.C. along rails Conclusions Our conclusion regarding the adequacy of the existing roof is based on the fact that the additional weight of the solar array is 3 psf or less. In the area of the solar array, other live loads will not be present or will be greatly reduced. The member forces in the area of the solar panels are not increased by more than 5%; thus, the stresses of the structural elements are not increased by more than 5%, Therefore, the requirements of Section 3403.3 of the 2012 IBC are met and the structure is permitted to remain unaltered. 651 W. Galena Park Blvd„ Ste. 101 / Draper, UT 84020 / T (801) 990-1775 / F (801) 990-1776 / www-vectorse.com VSE Project Number: U2456-0052--171. Craig Nordfelt Residence T101212{}17 E E"1 S 1 1-1 E E R S The solar array will be flush -mounted (no more than 6" above the roof surface) and parallel to the roof surface. Thus, we conclude that any additional wind loading on the structure related to the addition of the proposed solar array is negligible. The attached calculations verify the capacity of the connections of the solar array to the existing roof against wind (uplift), the governing load case. The connections to the existing roof shall be spaced at 48" maximum. Because lateral loads are increasing by less than 10%, the installation of the solar panels meets the requirements in Section 3403.4 of the 2012 IBC and the structure is permitted to remain unaltered. Limitations Installation of the solar panels must be performed in accordance with manufacturer recommendations. All work performed must be in accordance with accepted industry -wide methods and applicable safety standards. The contractor shall notify Vector Structural Engineering, LLC should any damage, deterioration or discrepancies between the as -built condition of the structure and the condition described in this letter be found. Particular attention must be paid to the maximum allowable spacing of connections and the location of solar panels relative to roof edges. Connections to existing roof framing must be staggered so as not to overload any existing structural member, except at array ends. The use of solar panel support span tables provided by others is allowed only where the building type, site conditions, site-specific design parameters, and solar panel configuration match the description of the span tables. Electrical engineering is the responsibility of others. Waterproofing wound the roof penetrations is the responsibility of others. Vector Structural Engineering assumes no responsibility for improper installation of the solar array. Vector Structural Engineering assumes no responsibility for the effects of snow falling from roofs onto other roofs, property or persons due to the installation of the solar array. VECTOR STRUCTURAL ENGINEERING, LLC ID Firm license number: C2269 Wells Holmes, P.E. ID License: P-12254 - Expires; 10/31/2017 Project Engineer Enclosures WLHIafa 10/02f2017 651 W. Galena Park Blvd., Ste. 101 / Draper, UT 84020 / T (801) 9910-1775 / F (801) 990-1775 / www.vectorse.corn JOB NO.: 02456-0052-171 ET SUBJECT: WIND PRESSURE E n S i n E E R S PROJECT: Cram Nordfelt Residence Com onents and Cladding Wind Calculations Label: I Solar Panel Array SITE-SPECIFIC WIND PARAMETERS: Basic Wind Speed [mph]: 115 Notes: Exposure Category: C Risk Category: II ADDITIONAL INPUT & CALCULATIONS: Note: Calculations per ASCE 7-10 Height of Roof, h [ft]: 25 (Approximate) Comp/Cladding Location: Gable/Hip Roofs 7® < 6 s 27° Hip? Enclosure Classification: Enclosed Buildings Zone 1 GCP: 0.9 Figure 30.4-28 (enter largest abs. value) Zone 2 GCP: 1.7 (enter largest abs. value) Zone 3 GCP: 2.6 (enter largest abs. value) a: 9.5 Table 26.9-1 zg M: 904 Table 26.9-1 Kh- 0.95 Table 30.3-1 K;!,: 1 Equation 26.8-1 Kd' 0.85 Table 26.6-1 Velocity Pressure, qn [psf]: 27.2 Equation 34.3-1 GCP,: 0 Table 26.111 (largest abs. value) OUTPUT: P = 4hGCp — GCy, Equation 30.9-1 Zone 1 Pressure, p [psf]: 24.5 psf (1.4 W, Interior Zones*) Zone 2 Pressure, p [psf]; 46.2 psf (1.4 W, End Zones") Zone 3 Pressure, p [psf]: 70.7 psf (1.4 W, Corner Zones* within a) (a= 3 ft) No JOB NO.: U2456-0052-171 TSUBJECT: CONNECTION n o i n e E R S PROJECT: Craig Nordfelt Residence Lag Screw Connection Capacity: Demand:. Lag Screw Size [in]: 5116 Cd: 1.6 NDS Table 2,3,2 Pressure Max Max, Tf�ib. Max. Uplift Embedment' [in]: 2.5 (0.6 Wind} psf Tributary Width (ft) Area (ft) Farce (Ibs) Grade: SPI` (G = 0.42} Zone Capacity [Ibs/in]: 205 NDS Table 12.2A 1 14.7 4.0 11.0 162 Number of Screws: 1 2 27.7 4.0 11.0 305 Prying Coefficient: 1.4 3 42.4 3.0 8.3 350 Total Capacity [Ibs]: 586 Demands Capacity: CONNECTION OKAY 1. Embedment is measured from the top of the framing member to the beginning of the tapered tip of the lag screw. Embedment in sheathing or other material is not effective. The length of the tapered tip is not part of the embedment length. 2.'Max. Trib Area' is the product of the'Max. Tributary Width' (along the rails) and 112 the panel width/height (perpendicular to the rails). JOB NO.: U2456-0052-171 TSUBJECT: GRAVITY LOADS E n Q f rl E E R S PROJECT: Craig Nordfelt Residence CALCULATE ESTIMATED GRAVITY LOADS ROOF DEAD LOAD I Roof Pitchf12 Composite Shingles 112° Plywood Framing Insulation 112" Gypsum Clg. M, E & Misc Increase due to Original pitch loading 2.1 3.7 1.0 17 3.0 psf 0.5 psf 2.0 psf 1.5 psf DL 10 psf PV Array DL 3 psf 1.05 2.0 psf 1.05 1.0 psf ROOF LIVE LOAD (Lr) Existing Design Roof Live Load [psf] 20 ASCE 7-10. Table 4-1 Roof Lige Load With PV Array [psf] 0 wl Solar Panel SNOW LOAD (S): Existing Array Roof Slope [x:12]: Roof Slope ['°]: Snow Ground Load, p. [psf]: Terrain Category: Exposure of Roof: Exposure Factor, Ce: Thermal Factor, Cx: Risk Category: Importance Factor, I,: Flat Roof Snow Load, pf [psf]: Minimum Roof Snow Load, pn, [psf]: Unobstructed Slippery Surface? Slope Factor Figure: Roof Slope Factor, Cg: Sloped Roof Snow Load, ps [psf]: Design Snow Load, S [psf]: 3.7 3.7 17 17 50 50 C C Fully Exposed Fully Exposed 0.9 0.9 1.1 1.1 II [I 1.0 1.0 35 35 35 35 - No No Figure 7-2b Figure 7-2b 1.00 1.00 35 35 35 35 ASCE 7-10, Section 7.2 ASCE 7-10, Table 7-2 ASCE 7-10, Table 7-2 ASCE 7-10, Table 7-2 ASCI= 7-10, Table 7-3 ASCE 7-10, Table 1.5-1 ASCE 7-10, Table 1.5-2 ASCE 7-10, Equation 7.3-1 ASCE 7-10, Section 7.3.4 ASCE 7-10, Section 7.4 ASCE 7-10, Section 7.4 OSCE 7-10, Figure 7-2 OSCE 7-10, Equation 7.4-1 JOB NO.: U2456-0052-171 SUBJECT: LOAD COMPARISON E n C9 I n E E R S PROJECT: Craig Nordfelt Residence Summary of Loads Existing With PV Array D [pst] 10 13 Lr [psf] 20 0 5 [psq 35 35 Maximum Gravity Loads: Existing With PV Array D + LT [psf] 30 13 ASCE 7-10, Section 2.4.1 D + 5 [psf) 45 48 ASCE 7-10, Section 2.4.1 Maximum Gravity Load (psfl:l 45 14$ Maximum Member Forces: LOCATION I Nouse GEOMETRY Span(ft) 48.2 (Approximate) Solar Panel Array Start, a (ft) 1.0 (Approximate) Solar Panel Array Length, b (ft) 11.0 (Approximate) Truss/Rafter Spacing (ft) 2.0 MEMBER FORCES Vertical Reaction, Vl (lbs) Vertical Reaction, Vz (lbs) Moment @ Center, M (lbs -ft) Existing With PV Array Ratio 2176 2233 103% 2176 2185 100% 26216 26431 101% The member forces in the area of the solar array are not increased by more than 5%; thus, the stresses of the structural elements are not increased by more than 5%. Therefore, the requirements of Section 3403.3 of the 2412 IBC are met and the structure is permitted to remain unaltered. OK OK OK CONTRACTER INFO w�a oo z mmn--1 o D.. ca ra is o o r0t729 1 m NORDFELT, CRAIG om wo F,Ov[n(7n > arm>rAM 3� MA r �. m m G) Cha cn(R2 `cz 00-4 mcomS'Zrr-zm m bG3m0 � a co .1 Q N�Px17�G] — *z= Ve -'�—o� 2 rat t' R'I L p -I wM f�I1 R�1= : O m= r, O C pa -0(n& mo mma co Z >o m Orn K mg r m -1 -Vo .�7 v m r m m Xmc0 ao=m m m Xriaa K m1v AA mQ O pomp zcM y map z F4M 0 rn m m a rn mem ZZ po F Sm CA m o m 0 a m m i m4 m C} A r 0 m m 2 lu Q n 0 emir fp TI m_ -f zz O M [7r m W C° (77 N --ifA M n i PM p I- A y� _ z m m m rn M� q ch o �--I, o f1 G m { ■ 2 -1 1� D CI] In i7 N > z O n 0 x Gars r 0 --G _ v cin n O 1 0 r- Gam? m Cs m --IU7 0m F 'z' � � cis Oo Y w z z � � o n r :.. m C z Gz} oT3 Uri {7 Z, C3 zm co � m caC�J1 -n .Z1 z m m m m 0m �z O O H c-�I 0c 03 m Q 4 n iCal o O A 2 a rn tm'� Z C7 m CONTRACTER INFO 4 HOMEOWNER INFO - 2.9kW D.. 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