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Home My WebLink AboutBLDE-23-001382 plans w BARUN CORP September 8,2022 RE: CERTIFICATION LETTER Project Address: MORIN RESIDENCE 21 STILES ROAD YARMOUTH,MA 02664 Design Criteria: -Applicable Codes=2015 IBC/IEBC W/(780 CMR)9th Edition,2015 IRC W/(780 CMR)9th Edition,ASCE 7-10 and 2015 NDS -Risk Category=II -Wind Speed=140 mph,Exposure Category B,Partially/Fully Enclosed Method -Ground Snow Load=30 psf -ROOF 1:2 x 6 @ 16"OC,Roof DL=8 psf,Roof LL/SL=25 psf(Non-PV),Roof LL/SL=16.7 psf(PV) To Whom It May Concern, A structural evaluation of loading was conducted for the above address based on the design criteria listed above. Existing roof structural framing has been reviewed for additional loading due to installation of Solar PV System on the roof.The structural review applies to the sections of roof that is directly supporting the Solar PV System. Based on this evaluation,I certify that the alteration to the existing structure by installation of the Solar PV System meets the prescriptive compliance requirements of the applicable existing building and/or new building provisions adopted/referenced above. Additionally,the Solar PV System assembly including attachment hardware has been reviewed to be in accordance with the manufacturer's specifications and to meet and/or exceed the requirements set forth by the referenced codes. OF Ass,cyG HUMPHREY K. Sincerely, HUMPHREY Digitally signed by KARIUKI HUMPHREY K KARIUKI çs S1ROUCT9 L, Date:2022.09.08 KKARIUKI R ` 15:49:09-04'00' %uAL ENG STRUCT T • ONLY 1/5 BARU N CORP RESULTS SUMMARY MORIN RESIDENCE,21 STILES ROAD,YARMOUTH,MA 02664 MOUNTING PLANE STRUCTURAL EVALUATION MOUNTING PLANE . ROOF PITCH RESULT GOVERNING ANALYSIS (deg.) ROOF 1 30° OK IEBC IMPACT CHECK STANDOFF HARDWARE EVALUATION FOR WIND UPLIFT MOUNTING PLANE • WIND UPLIFT DCR ROOF 1 35.8% Limits of Scapa ol Work and Liability: 4/se existing structure has been reviewed bused on the assumption that it has been originally designed and constructed per appropriate codes. The structural analysis of the subject property is hosed on the provided .she survey data. The calculations produced far this structure is assessment are only for the roof framing.supporting the proposed PU installation referenced in the stamped planset and were made according to generally recognized structural „analysis standards and procedures. Ail RV modules, racking and attachment annponen ts shall be desionted and installea per manufacturer's approved guidelines and specifications. Th e.5e pions ore not stamped for water leakage or existing damage to the structural component that was not accessed during the site survey,Prior to commencement of work, the PV system Thstalier should verify that the existing roof ond connections ore in suitable condition and inspect framing noted on the certification letter and in/Arm the Engineer of Record of any discrepancies prior to installation. The installer should also check for any damages cnich as water clarnagio cracked„framing, eta am/inform the Engineer of Record of exi.sting deficiencies which are .iislayirotri and/or Were not observable during tire time of survey and have not been included in this scope of work. Any change in the scope of the work shah of be occeptea unless such change,.addition,or deletion is approved in advance and in writing by the Engineer of Record, Banta Cods Doston and Escumnesertng ! 610 batd.4506 I chlbilk@StbattmsladtPittom 1 moVVVV. ;''''''' ''GrP nom 2/5 f � BARON CORP LOAD CALCULATION ROOF 1 MORIN RESIDENCE,21 STILES ROAD,YARMOUTH,MA 02664 PV PANELS DEAD LOAD(PV-DL) PV Panels Weight = 2.50 psf Hardware Assembly Weight = 0.50 psf Total PV Panels Weight PV-DL= 3.00 psf ROOF DEAD LOAD(R-DL) Existing Roofing Material Weight Composite Shingle Roof 1 Layer(s) = 2.50 psf Underlayment Weight = 0.50 psf Plywood/OSB Sheathing Weight = 1.50 psf Framing Weight 2 x 6 @ 16 in.O.C. = 1.72 psf No Vaulted Ceiling = 0.00 psf Miscellaneous = 1.50 psf Total Roof Dead Load R-DL= 7.70 psf REDUCED ROOF LIVE LOAD(Lr) Roof Live Load Lo= 20.00 psf Member Tributary Area At< 200 ft2 ROOF 1 Pitch 30°or 7/12 Tributary Area Reduction Factor R1= 1.00 Roof Slope Reduction Factor R2= 0.85 Reduced Roof Live Load,Lr=Lo(R1)(R2) Lr= 17.00 psf SNOW LOAD Ground Snow Load pg= 30.00 psf Effective Roof Slope 30° Snow Importance Factor Is= 1.00 Snow Exposure Factor Ce= 1.00 Snow Thermal Factor Ct= 1.10 Minimum Flat Roof Snow Load pf-min= 25.00 psf Flat Roof Snow Load pf= 25.00 psf SLOPED ROOF SNOW LOAD ON ROOF(Non-Slippery Surfaces) Roof Slope Factor Cs-roof= 1.00 Sloped Roof Snow Load on Roof ps-roof= 25.00 psf SLOPED ROOF SNOW LOAD ON PV PANELS(Unobstructed Slippery Surfaces) Roof Slope Factor Cs-PV= 0.67 Sloped Roof Snow Load on PV Panels ps-PV= 16.70 psf 3/5 — � ^ �� U UA� n�� U� ��U� ROOF 1 momm xsaosmcc'zzsr/Lss xoxo'v^xMouT*'wAo2oo4 EXISTING WITH PVPANELS Roof Dead Load(oL)= 7J0 10.70 v,f Roof Live Load(L,)~ 17.00 0.00 nu Roof Snow Load(sL)~ 25.00 zoJo n,, EXISTING WITH PVPANELS (nL+Lr)/cd~ 19.76 11.89 psf (oL+s/)/cu~ 28.43 z».uy nsf Maximum Gravity Load~ 28.43 z».ua nsf Load Increase(m)~ '16.21m OK |cucpmviuon: unz: The requirements of section 807.4 of 2015 lEBC are met and the structure is permitted to remain unaltered. 8e/unCorp | Des`gnandEnQinaenn� | ��O2Ol45051o�na�V�han.n'co/� non` | ��wban/" norpnom ...... ; 4 WIND UPLIFT CALCULATION BARU N CORP ROOF 1 MORIN RESIDENCE,21 STILES ROAD,YARMOUTH,MA 02664 SITE INFORMATION Ultimate Wind Speed= 140.00 mph Roof Pitch= 30° Risk Category= II Roof Type= Gable Exposure Category= B Wind Directionality Factor,Kd= 0.85 Mean Roof Height= 20.00 ft Topographic Factor,Kzt= 1 Solar Array Dead Load= 3.00 psf Velocity Pressure Exposure Coeff.,Kz= 0.62 DESIGN CALCULATIONS Wind Velocity Pressure(qh)=0.00256*Kz*Kzt*Kd*Ke*V2= 26.61 psf a(ft)= 4.50 Array Edge Factor(yE)= 1.50 Solar Array Pressure Equalization Factor(ya)= 0.60 Hardware Type: ROCKIT MOUNT Allowable Load= 850.00 lbs D.Fir-L,5/16"Lag Screw x 1,2.5"Embedment Max.X-Spacing(Zone 1-2r) 4.00 ft Effective Wind Area Max.Y-Spacing(Zone 1-2r) 2.87 ft 11.48 ft2 Max.X-Spacing(Zone 2n&3r) 4.00 ft Effective Wind Area Max.Y-Spacing(Zone 2n&3r) 2.87 ft 11.48 ft2 Max.X-Spacing(Zone 3e) 3.00 ft Effective Wind Area Max.Y-Spacing(Zone 3e) 2.87 ft 8.61 ft2 ROOF ZONE GCp(-)UPLIFT UPLIFT PRESSURE PULLOUT FORCE 1-2r -1.74 -23.45 psf 269.16 lbs 2n&3r -1.95 -26.52 psf 304.44 lbs 3e -2.56 -35.22 psf 303.20 lbs NOTE: •Wind calculation is based on ASCE 7-16,29.4-C&C,LC#7:0.6D+0.6W is used. 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