17 CROWDIS ST - BUILDING PERMIT APP RECEIVED
INSPECTIONAL SERVICES
Tl3- Lt - t $3261 G< 2 16
9, The Commonwealth of Massachusetts
/9 Board of Building Regulations and Standards CITY OF
p�9 Massachusetts State Building Code,780 CMR SALEM
Revised Afar 2011
Building Permit Application To Construct,Repair,Renovate Or Demolish a
One-or Two-Family Dwelling
This Section For Official Use Only
Building Permit Number: Date A ied: /
Building Official(Print Name) Signature Date
t SECTION 1:SITE INFORMATION
I I I�per�M vs J _ 1.2 Assessors Map&Parcel Numbers
L la Is this an accepted street?yes x no Map Number Parcel Number
1..3 Zoning Information: 1.4 Property Dimensions:
Zoning District Proposed Use Lot Area(sq It) Frontage(11)
1.5 Building Setbacks(ft)
Front Yard Side Yards Rear Yard
Required Provided Required Provided Required Provided
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?
Check if yes❑ Municipal❑ On site disposal system ❑
SECTION 2: PROPERTY OWNERSHIP'
2.1 Owner' f c r
Oinfi guyen Salem NIA.
Name(Pri City,Slate,ZIP
1� Crowdis St. 781 -760-2615 Ninhnguyen08@yahoo.com
No.and Street Telephone Email Address
SECTION 3:DESCRIPTION OF PROPOSED WORK'(cheek all that apply)
New Construction X I Existing Building❑ 1 Owner-Occupied ❑ 1 Repairs(,) ❑ 1 Alteration(s) ❑ Addition ❑
Demolition ❑ Accessory Bldg.❑ Number of Units_ Other ❑ Specify:
Brief Description of Proposed Work':
t71'DV }qIG Solar
SECTION 4:ESTIMATED CONSTRUCTION COSTS
LI.Building
Estimated Costs:
Labor and Materials) Official Use Only
$ i - `� 1. 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 $
Suppression) Total All Fees:$
�� Check No. Check Amount: Cash Amount:
6.Total Project Cost: $ ❑Paid in Full 0 Outstanding Balance Due:
SECTIONS: CONSTRUCTION SERVICES
5.11-Construction Supervisor License(CSL) 0 25 4 <9 2$
-U.me-�s License Number Expi anon ate
Name of CST.Holder
�l �kcLiy) S l r e 1 List CST.'I'ype(see below) U
No.and Street �f" 1I YPe Description
S (l S �{� 0)q D LO tl Unrestricted(Buildings u to 35,000 cu,ft.
erA44� R Restricted 1&2 familyDwellin
City/Town,S Z P M Mason
ry
RC Roofing Covering
WS Window and Siding
_ � ��ff �'" SF Solid Fuel Burning Appliances
ICJ W YI/1lY Cf1�Y0 Vj Uttj'�rDV,cf 1 Insulation
Tele hone Email address C.Orn I D. Demolition
5.2 Registered Home Improvement Contractor(HIC)
yl l\11nt SO,Qr iJLVe-`0,�1� �-�-G._ HIC Registration Number Epirat on ate
HIC Com ny Name or HIC R gistranl Name
4g3 �N._ 3oD V�. w�[xSoLcr(L�lvwtvl�`c-solar
No and Storeet UT- $t}(004 Email address L rut
t
�oV -1$13053o1Q5
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..........A No...........❑
SECTION 7a:OWNER AUTHORIZATION TO BE COMPLETED WHEN
OWNER'S AGENT OR CONTRACTOR APPLIES FOR BUILDING PERMIT
1,as Owner of the subject property,hereby authorize VI V 1V-t SO ICLV'
to act on my behalf, in all matters relative to work authorized by this building permit application.
VjTr— 9/2/14
Front Owner's Name(Flcctronic 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 th' p lion is true and accurate to the best of my knowledge and understanding.
V fi 0.,- q-31LI
Print Chas x r rized Agent's Name(Electronic Signature) Date
NOTES:
I. 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.gov/oca Information on the Construction Supervisor License can be found at www.nrass nov/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"
,�.bovint. so I a r 4931 North 300 West
Structural Group Provo,UT84604
- P: (801)234-7050
Scott E. Wyssling, PE
Head of Structural Engineering scott.wyssfing@vivintsolar.com
August 28, 2014
Mr. Dan Rock, Project Manager
Vivint Solar
24 Normac Road
Woburn MA 01801
Re: Structural Engineering Services
Nguyen Residence
17 Crowdis Street, Salem MA
AR#3225018
9.50 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 2 x 8
dimensional lumber at 16" on center with 1 x 6 collar ties every 16". 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
28 degree roof slopes on the dwelling areas. Ground snow load is 40 PSF for Exposure"B", Zone
2 per (ASCE/SEI7-10).
2. Total area subject to wind uplift is calculated for the Interior, Edge and Corner Zones of the
dwelling.
vivi t. Sour
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 oanels/mounting 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.
C. Root 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.
3. Considering the roof slopes, the size, spacing, condition of roof, the panel supports shall be
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) rafter spaces or 64"o/c,
whichever is less.
4. Panel supports connections shall be staggered to distribute load to adjacent rafters.
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 trulyPyours,
/^J o�yNOF SSgcym
CN1
Scott E.Wyssf PE ° 'g
MA License N .50 90 EGISTEP�
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bibint. solar
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PLAN DRAWN BY'EF I AR 3225018 asl MoMod 7/3012014 UTILITYACCOUNT NUMBER:254173016
Plane Calculations (ASCE 7-10): 1
Roof Type: Composition Shingle
Average Roof Height: 25.0 ft
Least Horizontal Dimension: 16.0 ft
Roof Slope: 28.0 deg
Truss Spacing: 17.0 in
Edge and Corner Dimension: 3.0 ft
Snow Load Calculations
Description Interior Edge Corner Unit
Flat Roof Snow Load 33.6 33.6 33.6 psf
Slope Factor 0.77 0.77 0.77
Roof Snow Load 25.9 25.9 25.9 psf
Wind Pressure Calculations
Description Interior Edge Corner Unit
Net Design Wind Pressure Uplift -20.7 -24.3 -24.3 psf
Net Design Wind Pressure Downforce 19.4 19.4 19.4 psf
Adjustment Factor for Height and Exposure Category 1.0 1.0 1.0
Design Wind Pressure Uplift -20.7 -24.3 -24.3 psf
Design Wind Pressure Downforce 19.4 19.4 19.4 psf
ASD Load Combinations
Description Interior Edge Corner Unit
Dead Load 2.3 2.3 2.3 psf
Snow Load 25.9 25.9 25.9 psf
Downslope: Load Combination 3 11.8 11.8 11.8 psf
Down: Load Combination 3 22.2 22.2 22.2 psf
Down: Load Combination 5 13.7 13.7 13.7 psf
Down: Load Combination 6a 25.9 25.9 25.9 psf
Up: Load Combination 7 -11.2 -13.3 -13.3 psf
Down Max 25.9 25.9 25.9 psf
Spacing Results(Landscape)
Description Interior Edge Corner Unit
Max Allowable Spacing Between Attachments 64.5 64.5 64.5 in
Max Spacing Between Attachments With Rafter/Truss Spacing of 17.0 in 51.0 51.0 51.0 in
Max Cantilever from Attachment to Perimeter of PV Array 21.5 21.5 21.5 in
Spacing Results(Portrait)
Description Interior Edge Corner Unit
Max Allowable Spacing Between Attachments 42.2 42.2 42.2 in
Max Spacing Between Attachments With Rafter/Truss Spacing of 17.0 in 34.0 34.0 34.0 in
Max Cantilever from Attachment to Perimeter of PV Array 14.1 14.1 14.1 in