23 BUENA VISTA AVE - BPA-14-1842 I i3 - l �l - t.g 2 33 C-r- zq5 -7
The Commonwealth of Massachusetts
y Board of Building Regulations and Standards CITY OF
/P Massachusetts State Building Code,780 CMR SALEM
"o!a Revised A9nr 2011
Building Permit Application To Construct, Repair, Renovate Or Demolish a
!� One-or Two-Family Dwelling
r y,� this Section For Official Use Only z
Building Permit Number: D e Applied: at m
n
1 ' ° o Fit
`�- Building Official(Print Name) Signature ale Zm
SECTION l:SITE INFORMATION On r<
1.1operty Address: rn
1.2 Assessors Map& Parcel Numbers t.� rnr�
E �o�4\ yls�P1
I.I a Is this an accepted street?yes x no Map Number Parcel Number Q nI
1.3 Zoning Information: 1.4 Property Dimensions: n
Zoning District Proposed Use Lot Area(sq 8) Frontage(m
1.5 Building Setbacks(ft)
Front Yard Side Yards Rear Yard
Req Provided Required Provided Required Provided uired
1.6 Water Supply:(M.G.L c.40,§54) 1.7 Flood Zone Information: 1.8 Sewage Disposal System:
Public❑ Private❑ Zone: _ Outside Flood Zone? Municipal❑ On site disposal system ❑
Check if yes❑
SECTION 2: PROPERTY OWNERSHIP'
2.1 Owner'of Record: William Duncan
Salewl Ma
Name(Print) Cit ,State,ZIP
23 Buena Vista Ave 617 4�0-6055 Nancy_duncan@vmed.org
No.and Street Telephone Email Address
SECTION 3:DESCRIPTION OF PROPOSED WORK(check all that apply)
New Construction j8( Existing Building❑ Owner-Occupied ❑ 1 Repairs(s) ❑ Altcration(s) ❑ 1 Addition ❑
Demolition ❑ Accessory Bldg.❑ Number of Units_ I Other ❑ Specify:
Brief Description of Proposed Work':
DtlmlvvnllalC solar SNS-te-wlS
SECTION 4:ESTIMA ED CONSTRUCTION COSTS
Item Estimated Costs: Official Use Only
Labor and Materials)
I.Building $ I. Building Permit Fee:$ Indicate how fee is determined:
2. Electrical $ ❑Standard city/Town Application Fee
❑Total Project Cost(Item 6)x multiplier x
3. Plumbing $ 2. Other Fees: $
4. Mechanical (HVAC) $ List:
5. Mechanical (Fire $
Su ression Total All Pecs:$
Check No._Check Amount: Cash Amount:_
6.Total Project Cost: $�-{gl��.�Q ❑Paid in Full 0 Outstanding Balance Due:
SECTION 5: CONSTRUCTION SERVICES
5.1 Construction Supervisor License(CSL) I'�
1- 6L1-525 2$��1CLYV(�S S1nerYYla..r'� License Numberr `6 Espy aeon ate
Name of CSL Holder
R 1 ka In S l r�� List CSI.'I ype(see below) U
No and Street 1 , IYPe Desenplion
Set l�s / ��� p U Unrestricted(Huildin s u to 35,000 cu. ft.)
'vl LO R Restricted 1&2 Family Dwelling
City/Town,S . "ZIP M Mason
iv
RC Routing Covering
WS Window and Sidin
_ ''W'-CC 's�.� I__ SF Solid Fuel Burning Appliances
"1a13 D 1VIGt_ZoLaro v j v try pDlt tu. I Insulation
Telephone Email address Y) I D Demolition
5.2 Registered Home Improvement Contractor(HIC)
UCWLt Sofa-' Devetop2Y. L l C 1 I o5s 48 )
HIC Registration Number E piral on Date
HIC Com airy Name or HIC R gistrant Name
4�13 N. 3oD YV\,aSxD vtvtvlksolav
No.and Street Entail address a s�rvt
PrOVO UT '6q(DD4 -1`1 37 30LIS
City/Town,State.ZIP Telephone
SECTION 6:WORKERS'COMPENSATION INSURANCE AFFIDAVIT(M.G.L.C. 152.§ 25C(6))
Workers Compensation Insurance affidavit must be completed and submitted with this application. Failure to provide
this affidavit will result in the denial of the Issuance of the building permit.
Signed Affidavit Attached? Yes .........:� No ...........O
SECTION 7a:OWNER AUTHORIZATION TO BE COMPLETED WHEN
OWNER'S AGENT OR CONTRACTOR APPLIES FOR BUILDING PERMIT
I,as Owner of the subject property,hereby authorize VIV 1VIt SI ACIk—
to act on my behalf,in all matters relative to work authorized by this building permit application.
gt/,� 10/21 /14
Print Owners Name(Electronic Signature) Date
SECTION 7b: OWNEW OR AUTHORIZED AGENT DECLARATION
By entering my name below, I hereby attest under the pains and penalties of perjury that all of the information
contained in fh' p tion is true and accurate to the best of my knowledge and understanding.
�1! �
Print Own s r >ri'red Agent's Name(Electronic Signature) Dale
NOTES:
1. An Owner who obtains a building permit to do his/her own work,or an owner who hires an unregistered contractor
(not registered in the Home Improvement Contractor(HIC)Program), will not have access to the arbitration
program or guaranty fund under M.G.L.c. 142A. Other important information on the HIC Program can be found at
www.mass. ol? v/oca Information on the Construction Supervisor License can be found at www.mass.gov/dos
2. When substantial work is planned,provide the information below:
Total floor area(sq. ft.) (including garage, finished basement/attics,decks or porch)
Gross living area(sq, ft.) Habitable room count
Number of fireplaces Number of bedrooms
Number of bathrooms Number of half/baths
'type of heating system Number of decks/porches
Type of cooling system Enclosed Open
3. "Total Project Square Footage"may be substituted for"Total Project Cost"
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3301 North Thanksgiving Way,Suite 500
Structural Grou Lehi,UT 84043
p P: (801)234-7050
Scott E. Wyssling, PE
Head of Structural Engineering scott.wysslingga vivintsolar.com
October 22, 2014
Mr. Dan Rock, Project Manager
Vivint Solar
24 Normac Road
Woburn MA 01801
Re: Structural Engineering Services
Duncan Residence
23 Buena Vista Avenue, Salem MA
S-4033016
9.69 kW System
Dear Mr. Rock:
Pursuant to your request, we have reviewed the following information regarding solar panel installation on
the roof of the above referenced home:
1. Site Visit/Verification Form prepared by a Vivint Solar representative identifying specific
site information including size and spacing of rafters for the existing roof structure.
2. Design drawings of the proposed system including a site plan, roof plan and connection
details for the solar panels. This information was prepared by the Design Group and will
be utilized for approval and construction of the proposed system.
3. Photovoltaic Rooftop Solar System Permit Submittal identifying design parameters for the
solar system.
4. Photographs of the interior and exterior of the roof system identifying existing structural
members and their conditions.
Based on the above information we have evaluated the structural capacity of the existing roof system to
support the additional loads imposed by the solar panels and have the following comments related to our
review and evaluation:
Description of Residence:
The existing residence is typical wood framing construction with the roof system consisting of the
fallowing:
• Roof Section 1: 2 x 6 dimensional lumber at 16" on center with 1 x 8 collar ties every 32".
• Roof Section 2: 2 x 8 dimensional lumber at 16"on center.
The attic space is unfinished and photos indicate that there was free access to visually inspect the size
and condition of the roof rafters. All wood material utilized for the roof system is assumed to be Spruce-
Pine-Fir#2 or better with standard construction components. Our review of the photos of the exterior roof
does not indicate any signs of settlement or misalignment caused by overstressed underlying members.
Stability Evaluation:
A. Wind Uplift Loading
1. Refer to attached Ecolibrium Solar calculations sheet for ASCE/SEI 7-10 Minimum Design Loads
for Buildings and other Structures, wind speed of 100 mph based on Exposure Category"B" and 8
and 22 degree roof slopes on the dwelling areas. Ground snow load is 40 PSF for Exposure "B",
Zone 2 per(ASCE/SEI 7-10).
2. Total area subject to wind uplift is calculated for the Interior, Edge and Corner Zones of the
dwelling.
r
Page 2 of 2
B. Loading Criteria
• 10 PSF= Dead Load roofing/framing 40 PSF=Live Load (around snow load)
• 5 PSF= Dead Load solar Panels/mountino hardware
Total Dead Load=15 PSF
The above values are within acceptable limits of recognized industry standards for similar
structures. Analysis performed of the existing roof structure utilizing the above loading criteria
indicates that the existing rafters will support the additional panel loading without damage, if installed
correctly.
r i C. Roof Structure Capacity
1. The photographs provided of the attic space and roof rafters show that the framing is in good
condition with no visible signs of damage caused by prior overstressing.
D. Solar Panel Anchorage
1. The solar panels shall be mounted in accordance with the most recent "Ecolibrium Solar
Installation Manual', which can be found on the Ecolibrium Solar website (ecolibriumsolar.com).
If during solar panel installation, the roof framing members appear unstable, deteriorated,
structurally compromised or deflect non-uniformly, our office should be notified before proceeding
with the installation.
2. Maximum allowable pullout per lag screw is 235 Ibs/inch of penetration as identified in the
National Design Standards (NDS) of timber construction specifications for Hem-Fir (North
Lumber) assumed. Based on our evaluation, the pullout value, utilizing a penetration depth of 2
1/2", is less than what is allowable per connection and therefore is adequate. Based on the
variable factors for the existing roof framing and installation tolerances, using a thread depth of 2
1/2" with a minimum size of 5/16" lag screw per attachment point for panel anchor mounts should
be adequate with a sufficient factor of safety.
roof I h size spacing, condition of roof, the panel supports shall be
3. Considering the oo slopes, the p PP
placed at and attached to no greater than every fourth roof rafter as panels are installed
perpendicular across rafters and no greater than the panel length when installed parallel to the
rafters (portrait). No panel supports spacing shall be greater than four 4 rafters aces or 64" o/c,
(P ) P PP P 9 9 O P
whichever is less.
4. Panel supports connections shall be staggered to distribute load to adjacent rafters.
Pp 99 1
Based on the above evaluation, it is the opinion of this office that with appropriate panel anchors being
utilized the roof system will adequately support the additional loading imposed by the solar panels. This
evaluation is based on information supplied to us at the time of this report and current industry standards and
practices.
Should you have any questions regarding the above or if you require further information do not hesitate to
contact me.
Ve trulyyours, o� tNOFMac y�
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Scott E. Wyssl' PE °
MA License N . 50 flp� FGISTEPc
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Imerler MakelMMel Enphace M21S6b2LL-S2x-ZC4A�py
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1.)IF UTILITY REQUIRES VISIBLE-BREAK SWITCH,DOES THIS PV Module Ratings Q STC(Guide Section 5) �> M
EOpha59 M215-60-2LL-S2x-ZC SWITCH MEET THE REQUIREMENTS? Z
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3.)SIZE PHOTOVOLTAIC POWER SOURCE(Di CONDUCTORS Max Series Fuse 01 15 Amps H
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MICROINVERTER CONNECTION _ RATING AT DISCONNECT. Maximum System Voltage 100r1(IECy600(Uy Q j
TO ENGAGE TRUNK CABLE 4.)SIZE INVERTER OUTPUT(AC)CONDUCTORS ACCORDING Voc Temperature Coefficient -032 %PC
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PV CIRCUIT.ODES TOTAL SUPPLY BREAKERS COMPLY
WITH 120%BUSBAR EXCEPTION IN 1.)Lowest expected ambient temperature based on ASHRAE minimum mean extreme
NEC690.64(13)(2)(a)? AYES NO tlry bulb temperature for ASHRAE location most similar to installation location: -19°C
#6 BARE CU GROUND
(GROUNDING ARRAY) Signs(See Guide Section 7) 2.)Highest continuous ambient temperature based on ASHRAE highest month 2%dry bulb
temperature for ASHRAE location most similar to installation location: 31
Sign for inverter DCPD and AC Disconnect: 3.)2005 ASHRAE fundamentals 2%design temperatures do not exceed 47°C in the
United States(Palm Springs,CA is 44.1°C).For less than 9 cumentcarrying conductors
Solar PV System AC Point of Connection in moamourded sunlit conduit at least as above mot and using the outdoor design
AC Output Current 34.200000 Amps temperature of 47'C or less(all of United States).
Nominal AC Voyage 240 Volts <
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PV CIRCUIT 1: 14 MODULES/PARALLEL or less when protected by a 12-Amp or smaller fuse.
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b.)10 AWG,90°G contluctprs are generally acceptable for modules with Ise of 9.6 Amps
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