Plans (2) FOR OFFICE USE ONLY—SITE ADDRESS:
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City of Tigard • COMMUNITY DEVELOPMENT DEPARTMENT
Transmittal Letter
13125 SW Hall Blvd. • Tigard,Oregon 97223 • 503.718.2439 • v.ww,tiaard-or.goy
TO: I -T` DATE
DEPT: BUIL15ING DIVISION " y ED
JUL i >_ 2021
FROM: -' CITY OF TIGARD
COMPANY: tt_ �L
BUILDING DIVISION
PHONE: �u ' C? t�—47 y7 7 2.
RE: C ?2 S�� ca ` OVA , {''_- A c;2A Z, 69 k 1 t
(Sit ddress) (Permit Number)
PAL-u1P
(Project name or subdivision name and lot number)
ATTACHED ARE THE FOLLOWING ITEMS:
Copies: Description: Copies: Description:
Additional set(s)of plans. Revisions:
Cross section(s) and details. Wall bracing and/or lateral analysis.
Floor/roof framing. Basement and retaining walls.
Beam calculations. )c Engineer's calculations.
Other(explain):REMARKS: 'KQ,O1 5e.tk.
cr� i "2—� '' k `ll' (1,A- )
�!b A.4.(t tz-ttl r & S '
Apt
FOR OFFICE USE ONLY
Rout to Permit Tec uian: Date: p_ ) L) �� Initials:
Fees Due: Y No Fee Description: Amount Due:
Special
Instructions:
Reprint Permit(per PE): []Yes ❑No ❑ Done
Applicant Notified: r Date: Initials:
1:1BuildinglFonns\TransmittalLetter-Revisions o61316.doc
, .
OFFICE COPY
VECTOR....) APPROVED
1=_ nG l n e E R s
REVISION
VSE Project Number:U4373.0009.211 F --,.‘ •o ) ^ 0 O
July 7,2021 1
----itPro-Slat Solar Group .7 J 9 - 2 1
1721 NE 64th Ave,Ste 120
Vancouver,WA 98661 RECEIVED
REFERENCE: Palmrose Residence: 13265 Southwest Bull Mountain Road,Portland,OR 97224
Pro-Stat Solar Group Project: PNW0503 JUL 1 4 ZOZI
Solar Array Installation CITY OF TIGARD
To Whom It May Concern: BUILDING DIVISION
Per your request, we have reviewed the existing structure at the above referenced site. The purpose of our review was to
determine the adequacy of the existing structure of the home to support the proposed installation of solar panels on the roof
as shown on the panel layout plan for the resident home,not the garage included in the array.
Based upon our review,we conclude that the existing home structure is adequate to support the proposed solar panel
installation.
Design Parameters
Code: Oregon Structural Specialty Code,2019 Edition(2018 IBC)
Risk Category:II
Design wind speed,Vult:97 mph (3-sec gust)per ASCE 7-16
Wind exposure category:B
Ground snow load,Pg: 10 psf
Minimum roof snow load,Pm:20 psf(not reducible)
Seismic design category:D
Existing Roof Structure
Roof structure:2x4 rafters @ 24"o.c.
Roofing material: composite shingles
Roof slope: 18°
Connection to Roof
Mounting connection:(1)5/16"lag screw w/min.2" threaded embedment into framing at max.48"o.c.along rails
(2)rails per row of panels,evenly spaced;panel length perpendicular to the rails not to exceed 71 in.Rail cantilever shall
not exceed 50%of connection spacing.
Conclusions
Based upon our review, we conclude that the existing home structure is adequate to support the proposed solar panel
installation. See attached calculations.
651 W.Galena Park Blvd.,Ste. 101/Draper, UT 84020/T(801)990-1775/F (801)990-1776/www.vectorse.com
VSE Project Number: U4373.0009.21 l
EC1 'O R Palmrose Residence
7/7/2021
E fl G I Cl E E R S
The solar array will be flush-mounted (no more than 10" 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. Regarding seismic loads, we conclude that any additional forces will be small. Conservatively
neglecting the weight of existing wall materials, the installation of the solar panels represents an increase in the total weight
(and resulting seismic load) of 3.1%. Because the increase in lateral forces is less than 10%, this addition meets the
requirements of the exception in Section 806.3 of the 2018 IEBC.Thus the existing lateral force resisting system 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 must 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. Connections to existing roof framing must be staggered,except
at array ends, so as not to overload any existing structural member. 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. The design of the solar panel racking(mounts,rails,etc.)and electrical engineering
is the responsibility of others. Waterproofing around the roof penetrations is the responsibility of others. Vector Structural
Engineering assumes no responsibility for improper installation of the solar array.
VECTOR STRUCTURAL ENGINEERING,LLC
96640PE
EXPIRES: 12/31.2022
07/07/2021
Coleman Larsen,P.E.
Project Engineer
Enclosures
CDL/zrm
651 W. Galena Park Blvd.,Ste. 101/Draper, UT 84020/T(801)990-1775/F(801)990-1776/www.vectorse.com
Ecr
0 R JOB NO.: U4373.0009.211
SUBJECT: CONNECTION
,' ,V
E n G I rl E E R S
PROJECT: Palmrose Residence
Calculate Uplift Forces on Connection
Pressure Max Trib. Max Uplift
Max Trib. Width 2
(0.6 Dead -0.6 Wind) Area Force
(psf) (ft) (ft2) (Ibs)
Zone 1, 2e 16.7 4.0 11.8 197
Zone 2n, 2r, 3e 24.9 4.0 11.8 295
Zone 3r 30.2 4.0 11.8 358
Calculate Connection Capacity
Lag Screw Size [in]: 5/16
Cd: 1.6 NDS Table 2.3.2
Embedment3 [in]: 2
Grade: SPF (G = 0.42)
Nominal Capacity [Ibs/in]: 205 NDS Table 12.2A
Number of Screws: 1
Prying Coefficient: 1.4
Total Capacity [Ibs]: 469
Determine Result
Maximum Demand [Ibs]: 358
Lag Screw Capacity [Ibs]: 469
Result: Capacity > Demand, Connection is adequate.
Notes
1. 'Max Trib. Width' is the width along the rails tributary to the connection.
2. 'Max Trib Area' is the product of the 'Max.Trib Width' and 1/2 the panel width/height perpendicular to the
rails. (2) rails per row of panels. Length of panels perpendicular to the rails shall not exceed 71".
3. 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.
, ,
ECT
0 R E n G 1 fl E E R S JOB NO.: U4373.0009.211
SUBJECT: GRAVITY LOADS
PROJECT: Palmrose Residence
GRAVITY LOADS Roof Pitch: 3.9 :12
Design material Increase due to Material weight
ROOF DEAD LOAD (D) weight [psf] pitch [psf]
Composite Shingles 2.1 1.05 2.0
1/2" Plywood 1.1 1.05 1.0
Framing 3.0 3.0
Insulation 0.0 0.0
1/2" Gypsum Clg. 0.0 1.05 0.0
M, E & Misc 2.0 2.0
Total Existing Roof DL 8.2
PV Array DL 3.2 1.05 3
ROOF LIVE LOAD (Lr)
Existing Design Roof Live Load [psf] 20 ASCE 7-16 Table 4.3-1
Roof Live Load With PV Array [psf] 0 2019 OSSC, Section 1607.13.5
SNOW LOAD (S): Existing w/ Solar Array
Roof Slope [x:12]: 3.9 3.9
Roof Slope [°]: 18 18
Ground Snow Load, pg [psf]: 10 10 ASCE 7-16,Section 7.2
Terrain Category: B B ASCE 7-16,Table 7.3-1
Exposure of Roof: Fully Exposed Fully Exposed ASCE 7-16,Table 7.3-1
Exposure Factor, Ce: 0.9 0.9 ASCE 7-16,Table 7.3-1
Thermal Factor, Ct: 1.1 1.1 ASCE 7-16,Table 7.3-2
Risk Category: II II ASCE 7-16,Table 1.5-1
Importance Factor, Is: 1.0 1.0 ASCE 7-16,Table 1.5-2
Flat Roof Snow Load, pf [psf]: 7 7 ASCE 7-16, Equation 7.3-1
Minimum Roof Snow Load, pm [psf]: 20 20 ASCE 7-16,Section 7.3.4
Unobstructed Slippery Surface? No Yes ASCE 7-16,Section 7.4
Slope Factor Figure: Figure 7-2b Figure 7-2b ASCE 7-16, Section 7.4
Roof Slope Factor, Cs: 1.00 0.87 ASCE 7-16, Figure 7.4-1
Sloped Roof Snow Load, ps [psf]: 7 6 ASCE 7-16, Equation 7.4-1
Design Snow Load, S [psf]: 20 20
VECTOR
E n G I n e E R s JOB NO.: U4373.0009.211
SUBJECT: WIND PRESSURE
PROJECT: Palmrose Residence
Components and Cladding Wind Calculations
Label: Solar Panel Array Note: Calculations per ASCE 7-16
SITE-SPECIFIC WIND PARAMETERS:
Basic Wind Speed [mph]: 97 Notes:
Exposure Category: B
Risk Category: II
ADDITIONAL INPUT& CALCULATIONS:
Height of Roof, h [ft]: 25 (Approximate)
Comp/Cladding Location: Gable Roofs 7°<0<_ 20°
Enclosure Classification: Enclosed Buildings
Zone 1, 2e GCp: 2.00 Figure 30.3-2B Zone 1, 2e Ya: 0.77 Fig.
Zone 2n, 2r, 3e GCp: 2.90 (negative coeff.) Zone 2n, 2r, 3e ya: 0.77 29.4-8
Zone 3r GCp: 3.47 Zone 3r ya: 0.77
a: 7 Table 26.11-1
zg [ft]: 1200 Table 26.11-1
Kh: 0.67 Table 26.10-1
Ke: 0.98 Table 26.9-1
Kn: 1 Equation 26.8-1
Kd: 0.85 Table 26.6-1
Velocity Pressure, qh [psf]: 13.3 Equation 26.10-1
yE: 1.50 Section 29.4.4
WIND PRESSURES: Equation 29.4-7 p = qh(GC1,)('E)(ya)
Zone 1, 2e, p [psf]: 30.8 psf (1.0 W)
Zone 2n, 2r, 3e, p [psf]: 44.6 psf (1.0 W)
Zone 3r, p [psf]: 53.4 psf(1.0 W)
(a = 3 ft)
VECTOR
E n G I n E E R s JOB NO.: U4373.0009.211
SUBJECT: SEISMIC LOADS
PROJECT: Palmrose Residence
CHECK INCREASE IN OVERALL SEISMIC LOADS
Estimated Roof Dead Load 12.2 psf
Solar Dead Load 3.0 psf
% Roof Covered 13%
Equiv. Total Dead Load 12.5 psf
Addt'l Seismic Weight 3.1%
Conservatively neglecting the weight of existing wall materials, the installation of the solar panels represents an
increase in the total weight(and resulting seismic load)of 3.1%. Because the increase is less than 10%, this
addition meets the requirements of the exception in Section 806.3 of the 2018 IEBC. Thus the existing structure is
permitted to remain unaltered.
Fs„ F,p, 9
VECTOR Abbrev GRADES (psi) (psi) E„(psi) (Ih/ft')
JOB NO.: U4373.0009211 DF1x1 DFL#1 1.000 180 1.7oo.000 32
E m G I Il E E R S ['FLIP DFL#2 900 180 1,600,000 32
DF1(6X) DFL41 5X5 8 LARGER 1,350 170 1.600,000 32
SPF#2 SPF#2 875 135 1,400,000 26.2
SP#2 SP#2 1,100 175 1400,000 34.31,100 175 1400,000 34.3
PROJECT: Palmrose Residence SUBJECT: BEAMS 24F-V4 24F-V4 2.400 240 1,800,000 32
24F-V8 24F-V8 2400 240 1,800,000 40
LVL(1.9) LVL(1.9X106E) 2,60D 285 1,900,000 40
DESIGN LOADS: Load Types: Snow Live Dead LVL(2.0) LVL(2.OX106E) 2,200 285 2,000,000 42
Roof 20 20 8 CRITERIA(LI) DTI DLL D1)1 LSL LSL(1.3%106E) 1.700 400 1.300,000 42
R
Solar 3.2 • (oLeNK) 120 180 STL36 GRADE 36 STEEL 21,600 14400 29,000,000 490
ST1_46 GRADE 46 STEEL 27,700 16.500 29,000,000 490
STL50 GRADE 50 STEEL 30,000 20,000 29,000,000 490
Point Point
ID
Add1 Add! A Live Dead
m 0
Roof Floor Wall Live Solar Point $ Dist Load Load as ; A 1.5DL
Length Trib Trib Trib Load Load Load y 'a' 'PLC 'PDC r9- =v A Mm„ Maio„. V . VNiw D-n DT1aya DLL DuIow. GLB
Label 'L'(ft) (ft) (ft) (ft) (plf) (plf) From in (ft) (Ib) )lb) w Grade Size z —y C, Co CFv R.(Ib) Rs(Ib) (ft-Ib) (ft-lb) (Ib) (Ib) (in) (in) (In) (in) Camb Check
Rafter 6 2 6.3 (1) SPF#2 2X4 1.15 1.15 1.50 188 188 282 443 170 543 0.243 0.600 0.155 0.400 0.64 M
Home Detail )VECTOR �REo PROFFs Elevation z12"Section 3111.4.8.1
l E n 0 i n E E R 9 �5 �� N�F� S o <18"Section 3111.5.3.5
651 W.GALENA PARK SLED.STE. I0) PHONE(BB))990.I775 A 07/07/2021
O RAPER.LITAN B4OZO www.vEcroRSE.caN \ ; 9 96640PE —
Vector Structural Engineering has reviewed the existing / / // 2 SE Project Number:U4373.0009.211
structure with loading from the solar array and screw _�, .1 18"
connections to the existing framing.The design of the
racking system,racking connections,and all other —
structural is by others.Mechanical,architectural,and all 0 1/0 11111 �0 Z 24'
other nonstructural aspects of the design are by others. 0� �, 10 D� r�
Electrical is by others,unless stamped by Dean Levorsen.
F414N p . \''' 23'
36"Pathway Section 3111.3.4.8.4(smoke vents) Ground to eve Ground to peak
>_12"Section 3111.4.8.1 (ridge) EXPIRES: 12/31/2022
/ chimney
��// Spans
/ Weight of solar<4.5 lb/sgft
chirrney 36" Pathway Comp roof, single layer
Section
i 3111.3.4.8.4 2x4 Rafters 24" OC
(smoke vents)
sureye1 70r6"
o J
1x6 ridge
2x4 rafters 24"OC
L39.9'1
2x4 supports 24"OC
2x6 beam 2x8 joists
6
Solar Array Setbacks:
�12" along all horizontal ridges per Section 3111.4.8.1 Suneye Legend (degrees): Page 2 of 4
36" Pathway around heat vents per Section 3111.4.8.4 1. Tilt= 18 Azimuth = 180 Job: Address:
Solar Array Coverage: PNW503 Gerald Palmrose
Solar Array Attachments: Solar racking attachments per Solar Array sgft=431 Rev: 13265 SW Bull Mountain Road
3111.3.5.3.3 24" OC within 3' of edge hip eve or ridge, 48" Roof Surface sgft= 3515 Portland, OR 97224
OC elsewhere Solar Array covers 12% of roof surface AM
PROSTAT ELECTRIC & SOLAR
Plot
103' VECTOR
C n O I rl E E R S
651 W.GALENA PARK BLVD.STE. 701 PHONE(50]1 990-7775
DRAPER,UTAH 54020 WWW.VECTORSE.CUM
R0 PRNFFS
96640PE . r-
11111LC:
Barn ooF v ����`�
tiiq N D
EXPIRES: 12/31/2022
07/07/2021
VSE Project Number:U4373.0009.211
Utility Meter Vector Structural Engineering has reviewed the existing
Main Panel home structure and not the garage structure with loading
from the solar array and screw connections to the existing
AC Disco framing.The design of the racking system.racking
\ connections,and all other structuralis by others.
Combiner i Mechanical,architectural,annall d all other nonstructural
aspects of the design are by others.Electrical is by
357' others,unless stamped by Dean Leversen.
Home
ll
eto
�Io4
hie. Aio Job: Address:
Page 1 of4
da
PNW503 Gerald Palmrose •
Rev: 13265 SW Bull Mountain Road
Portland, OR 97224
AM
PROSTAT ELECTRIC & SOLAR
Comp Roof Attachments spaced so that
2x framing
24" Max on Center no point load exceeds 50 psf
Solar Pane t
4.5PSF max
"Il/ECTOR
E n 0 1 f1 E E R 9
651 W.GALENA PARK BLVD.STE. 101 PHONE(6011 990-1775
• DRAPER,OTAN 84020 WWW.VEGTORSE.COM
<�0:i PROFe.
• J�. ��,� f,`F� s'0 Racking Details:
Panel connected J 96640PE Manufacturer= Iron Ridge
to rails with 1 connector ``_ - - �/ / Model = XR100
for each 8 Sq feet or less
per rack manufacturer's specs `� ti�� o �^
o� o�• o `p`L �F Attachment Details:
� ., F�iq N p �P� Manufacturer= Iron Ridge
Aluminum Rails to alternate b Model = FlashFoot2
EXPIRES: 12/31/2022
roof framing 4' OC max. •
• 07/07/2021
Two rails per min. per panel .
VSE Project Number:U4373.0009.211
Vector Structural Engineering has reviewed the existing
structure with loading from the solar array and screw
connections to the existing framing.The design of the
+ racking system,racking connections,and all other
r • structural is by others.Mechanical,architectural,and all
other nonstructural aspects of the design are by others.
Electrical is by others,unless stamped by Dean Levorsen.
I I Panels 39.98"X
70.67" aprox.
2X joist/truss to meet
Oregon Solar code span
requirements 18rr Page 4 of 4
Min fg"SS lag embedded 2"min
Max Job: Address:
center of framing member 2 Layers or less
of roof material PNW503 Gerald Palmrose
Rev: 13265 SW Bull Mountain Road
lashed and sealed Portland, OR 97224
roof penetration AM
PROSTAT ELECTRIC & SOLAR