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Monday, November 13, 2017 NOV 2 0 2017
Auric Solar CITY OF TIGARD
2310 S 1300 W BUILDING DIVISION
West Valley City, UT
RE: ROOF EVALUATION FOR 8340 SOUTHWEST FANNO CREEK DRIVE, TIGARD,
OREGON
As per your request I evaluated the support system for the proposed solar array for the
residence located at 8340 Southwest Fanno Creek Drive, Tigard, Oregon.
It is my understanding that the roof structure consists of pre-engineered trusses at 24" o.c.
where the solar panels will be located. The snow load is less than 50.0 psf and the wind load is
less than 120 psf. The roof will be supporting 16 solar panels.
Oregon Structural Specialty Code (OSSC) 2014 Section 3111.5.3 indicates that solar panels
that are installed on conventional light-framed construction with pre-engineered trusses or roof
framing members with a maximum spacing of 24" o.c. shall qualify as prescriptive and shall not
require an engineered design.
I can be reached at 435-654-6600 extension 123 with any questions.
Respectfully,
+off "GINE& /0
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EXPIRES 1414c‘
Adam Huff, S.E.
Epic Engineering, P.C.
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City of Tigard
Building Division i '
S 13125 SW Hall Blvd,Tigard, OR 97223
Phone: 503.718.2439 Fax: 503.598.1960
T I GARD Inspection Line: 503.639.41750 Q7
www.tigard-or.gov CITY OF TIGA
RD
2010 Oregon Solar Installation Specialty Code
Check List for Prescriptive Installation of Roof-Mounted
PhotoVoltaic Solar Panel System
Property Information
Installation Address: b `11 ,�,,�„ Cie, � \C
City: y ��
Zip: 9' 7 4
Owner's �e: \4L f Date: ((/�,a f 7
�� CCB #:
Contractor's Name: � ; S�Vt
Design Parameters of the Property/Structure
If"Yes", does not
Is the installation YeS qualify for the
Flood Hazard Located in a flood prescriptive path, follow
Area plain/flood way? No OSSC or ORSC for
design requirements.
Is the wind exposure Yes If"Yes", qualifies for
Wind Exposure "C" or less? [� No the prescriptive path.
Installations on detached Is the Ground Snow
single/two-family Load 70 psf or less?
dwelling/single/two- If"Yes", qualifies for
family townhomes / Yes the prescriptive path.
and/or their accessory ❑
Ground structures. No
Snow Load Is the Ground Snow
Installations on all Load 50 psf or less?
If"Yes", qualifies for
structures other than JK Yes the prescriptive path.
above ❑
No
1
I:/Building/Forms/PhotoVoltaic-Checkl ist.docx
Is the construction
material wood and does Yes
Type of If"Yes", qualifies for
Construction the construction qualify El No
as "conventional light the prescriptive path.
frame" construction?
Is the spacing 24 inches
or less?
Pre-engineered trusses. Yes If"Yes", qualifies for
the prescriptive path.
❑ No
Roof framing
members Is the spacing 24 inches
or less?
Nominal lumber. If"Yes", qualifies for
Yes the prescriptive path.
❑ No
Is the combined weight ja Yes
of the PV modules and If"Yes", qualifies for
racking less than or ❑ No the prescriptive path.
Solar equal to 4.5 psf?
installation Is the solar installation
layout in accordance Yes
with Section 305.4(3) of If"Yes", qualifies for
the 2010 Oregon Solar ❑ No the prescriptive path.
Code?
❑ Metal
Single layer If roofing material is
Roofing Check the type of ❑ of wood
YP one of the three types
material roofing material shingle/shake checked, qualifies for
Max. two layers the prescriptive path.
4 of composition
shingle.
Is the roof mounted
Connections of solar assembly Yes
the solar assembly connected to roof If"Yes", qualifies for
NO the prescriptive path.
to the roof framing or blocking ❑
directly?
2
I:/Building/Forms/Photovoltaic-Checklist.docx
,Y;
❑ Yes If"Yes", qualifies for
Is the gauge 26 or less? ❑
No the prescriptive path.
115 lbs for 60 inch
spacing or less?
❑ If"Yes", qualifies for
Yes the prescriptive path.
❑ No
Minimum Uplift rating
of Clamps? 75 lbs for 48 inches
spacing or less?
If"Yes", qualifies for
❑ Yes the prescriptive path.
❑ No
Attachment of
roof mounted Minimum 24 inches If the spacing falls
solar systems Spacing of clamps? within 24 inches and 60
directly to inches Maximum 60 inches inches, qualifies for the
standing seam prescriptive path.
metal panels Width of roofing If the width of the panel
panels? 18 inches or less
is less than 18 inches,
inches qualifies for the
prescriptive path.
'C- Minimum #10 at 24
inches o/c?
\\ Size and spacing of ❑ Yes If"Yes", qualifies for
fastener? the prescriptive path.
❑ No
Is the roof decking of
WSP min. '/2"thickness, ❑ Yes
decking connected to If"Yes", qualifies for
framing members ❑ No the prescriptive path.
w/min. 8d nails @
6"/12" o/c?
Is the height less than or
Maximum 18 inches equal to 18 inches?
Height of the from the top of the If"Yes", qualifies for
solar modules module to the roof Yes the prescriptive path.
surface. ❑ No
3
I:Building/Forms/Photo Voltaic-Checklist.docx
Submittal Documents required for Prescriptive In
Show the location of the PV system in relation to build
property lines, and, as applicable, flood hazard areas.
Site Plan Details must be clear and easy to read.
Minimum size of the plan is 8.5 x 11 inches.
Attach a simple structural plan showing the roof framing
spacing) and PV module system racking attachment.
System must be shown in sufficient detail and clarity to a
Structural Plan meets the prescriptive construction requirements as listed
matrix.
Minimum size of the plan is 8.5 x 11 inches.
Pv Modules
anufacturer:
•
•del Number: 5L A r .S‘,0
ting Agency: U,L t703
Voltaic-Checklist docx