REVIEWED RESUB 1 BLD2022-0853+Structural_Calculations+7.14.2022_8.57.31_PM+2991216BLD2022-0853
July 11, 2022
Puget Sound Solar
805 Rainier Avenue South
Seattle, WA 98144
TEL: (425) 260-1425
Attn.: Lyudmila Arseniy,
Re: Job # 2022-07618: Edmonds 99
P78
structural
ENGINEERS
REVIEWED
BY
CITY OF EDMONDS €
BUILDING DEPARTMENT
RESUB
Jul 15 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
The following calculations are for the Structural Engineering Design of the Photovoltaic Panels located at 23400
Highway 99, Edmonds, WA 98026.
If you have any questions on the above, please feel free to call.
Prepared By:
PZSE, Inc. - Structural Engineers
Roseville, CA
EXPIRES 08/0Z/2023
1478 Stone Point Drive, Suite 190, Roseville, CA 95661
i 916.961.3960 916.961.3965 . www.pzse.com
experience I integrity I Empowerment
RESUB
Jul 15 2022
■U-BUILDER PROJECT REQQPOEK�oFEDMONDS
■ RSU!1XMENTSERVICES
■■■
PARTMENT
PROJECT TITLE PROJECT ID CREATED
ROOFMOUNT RM10 5E6A6918 Oct. 21, 2021, 12:26 p.m.
NAME Edmonds 99 Designed by sayali@pugetsoundsolar.com
ROOFMOUNT RM10
ADDRESS 23400 HIGHWAY 99
REC SOLAR
CITY, STATE Edmonds, WA
19 -REC365TP4 Black
MODULE REC SOLAR REC365TP4 Black 373.26 ftz
6.94 KW
NOTE: Installation of the project is intended to happen within the year of project designed in UBuilder. If it's past one year please
rerun the design or contact Unirac Engineering Services.
BILL OF MATERIALS
LEGEND: ■ Base System Part ■ Accessory
PART SUGGESTED
NUMBER PARTTYPE DESCRIPTION QUANTITY QUANTITY
User
Ballast Block
Ballast Block
127
127
Supplied
310710
Ballast Bay
RM Ballast Bay 10 Degree
58
58
310760
RM Roof Pad
RM Roof Pad
64
64
310750
Module Clip
RM Module Clip
175
175
310751
RM Hex Bolt
RM Hex Bolt (Module Clip)
175
175
This design is to be evaluated to the product appropriate Unirac Code Compliant Installation Manual which references International
Building Code 2009, 2012, 2015, 2018 and ASCE 7-05, ASCE 7-10, ASCE 7-16 and California Building Code 2010, 2016. The installation of
products related to this design is subject to requirements in the above mentioned installation manual.
Page 2 of 9
DETAILED PARTS DESCRIPTION
RESUB
Jul 15 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
Q-115YPARTMENT
Ballast Block UserSupplied Ballast Block 127
Standard 4x8x16 inch cap blocks. Nationwide availability. Please confirm the weight of your
IV ballast block as this will affect the total blocks required for your installation.
Ballast Bay 310710 RM Ballast Bay 10 Degree 58
Aluminum ballast bay attaches to north and south module edges (for 10 degree tilt
installations) and provides ballast placement location.
RM Roof Pad 310760 RM Roof Pad 64
TPE 201-73 BK Santoprene Roof Pad. PLEASE NOTE: Depending on your roof type and
seismic conditions, some quantity of roof pads may be required. These will be listed
separately on your bill of materials.
Module Clip 310750 RM Module Clip 175
Aluminum clip fastens module frame to ballast bay and provides bonding path from module
to bay to module.
RM Hex Bolt 310751 RM Hex Bolt (Module Clip) 175
Hex bolt with integrated locking patch.
NOTE: Installation of the project is intended to happen within the year of project designed in UBuilder. If it's past one year please
rerun the design or contact Unirac Engineering Services.
Page 3 of 9
ENGINEERING REPORT
Plan review
AVERAGE PSF
TOTAL NUMBER OF MODULES
TOTAL KW
TOTAL MODULE AREA
TOTAL WEIGHT ON ROOF
RACKING WEIGHT
MODULE WEIGHT
BALLAST WEIGHT
MAX BAY LOAD (DEAD)
Loads Used for Design
BUILDING CODE
BASIC WIND SPEED
GROUND SNOW LOAD
SEISMIC (Ss)
ELEVATION
WIND EXPOSURE
M RI
RISK CATEGORY
VELOCITY PRESSURE, QZ
Loads Determined by Zip
CITY, STATE
BASIC WIND SPEED
GROUND SNOW LOAD
8.49 psf
19
6.94 KW
—602 ftZ
5105 Ibs
203 Ibs
838 Ibs
4064 Ibs
208 Ibs
ASCE 7-16
110.00 mph
25.00 psf
1.310
310.00 ft
B
50
22.61 psf
98026
Edmonds, WA
93.00 mph
20.00 psf
Inspection
PRODUCT
MODULE MANUFACTURER
MODEL
MODULE WATTS
MODULE LENGTH
MODULE WIDTH
MODULE THICKNESS
MODULE WEIGHT
BALLAST BLOCK (CMU) WEIGHT
MAX BLOCKS PER NORTH BAY
MAX BLOCKS PER NON NORTH BAY
BUILDING HEIGHT
ROOF TYPE
PARAPET HEIGHT
RISK CATEGORY
RESUB
Jul 15 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
ROOFMOUNT RM10
REC SOLAR
REC365TP4 Black
365 watts
69.10"
40.94"
1.20"
44.10 Ibs
32.0 Ibs
6
4
65.00 ft
EPDM
> 1 Array Height (> 12 inches)
11
Page 4 of 9
RESUB
Jul 15 2022
Roof Area 1 - Array1 CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
AVERAGE PSF
8.49 psf
MINIMUM SEISMIC SEPARATION (UNATTACHED ARRAYS)
ARRAY TO ARRAY:
12.6"
TOTAL NUMBER OF MODULES:
19
TO FIXED OBJECT ON ROOF:
25.2"
TOTAL KW:
6.94 KW
TO ROOF EDGE WITH QUALIFYING PARAPET:
25.2"
TOTAL AREA:
602 ft2
TO ROOF EDGE WITHOUT QUALIFYING PARAPET:
50.4"
TOTAL WEIGHT ON ROOF:
5105 lbs
MAX ARRAY (SEISMIC) (FOR UNATTACHED ARRAYS)
RACKING WEIGHT:
203 lbs
MAX NUMBER OF NORTH -SOUTH ROWS:
6
MODULE WEIGHT:
838 lbs
MAX NUMBER OF EAST -WEST COLUMNS:
14
BALLAST WEIGHT:
4064 lbs
*See ASCE 7-16 Section 13.6.12 for more details
Page 5 of 9
RESUB
RM10 U-BUILDER PRODUCT ASSUMPTIONS
RM10 - Ballasted Flat Roof Systems
Jul 15 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
Limitations of Responsibility: It is the user's responsibility to ensure that inputs are correct for your specific project.
Unirac is not the solar, electrical, or building engineer of record and is not responsible for the solar, electrical, or building design for this
project.
Building Assumptions
1. Risk Category III
2. Building Height < 50 ft
3. Building Height > 50 ft: only where (longest length of building x building height)A0.5 < 100 ft
4. Roof Slope >- 00 (0:12) and < 30 (5/8:12) for Seismic Design Category C, D, E and F. For low seismic regions Seismic Design Category A and
B (provided Array Importance factor = 1.0), Roof Slope >- 0° (0:12) and < 7° (1 1 /2:12).
5. Roofing Material Types: EDPM, PVC, TPO, or Mineral Cap
6. Surrounding Building Grade: Level
Ballast Blocks
The installer is responsible for procuring the ballast blocks (Concrete Masonry Units - CMU) and verifying the required minimum weight
needed for this design. CMU should comply with ASM standard specification for concrete roof pavers designation (C1491 or C90 with an
integral water repellent suitable for the climate it is placed. It is recommended that the blocks are inspected periodically for any signs of
degradation. If degradation of the block is observed, the block should immediately be replaced.
The CMU ballast block should have nominal dimensions of 4"x8"xl6". The actual block dimensions are 3/8" less than the nominal
dimensions. Ballast blocks should have a weight as specified for the project in the "Inspection" section of this report.
Design Parameters
1. Risk Category I to III
2. Wind Design
a. Basic Wind Speed: 85-120 mph (ASCE 7-05)/110-150 mph (ASCE 7-10)/90-180 mph (ASCE 7-16)
b. Exposure: B, C or D (ASCE 7-05/ASCE 7-10)
c. 25 year Design Life/50 year Design Life for ASCE 7-16
d. Elevation: Insertion of the project at - grade elevation can result in a reduction of wind pressure. If your project is in a special
case study region or in an area where wind studies have been performed, please verify with your jurisdiction to ensure that
elevation effects have not already been factored into the wind speed. If elevation effects have been included in your wind
speed, please select 0 ft as the project site elevation.
e. Wind Tunnel Testing: Wind tunnel testing coefficients have been utilized for design of the system.
3. Snow Design
a. Ground Snow Load: 0-80 psf (ASCE 7-10/ASCE 7-16)
b. Exposure Factor: 0.9
c. Thermal Factor: 1.2
d. Roof Snow Load: Calculation per Section 7.3 (ASCE 7-05/ASCE 7-10/ASCE 7-16)
e. Unbalanced/Drifting/Sliding: Results are based on the uniform snow loading and do not consider unbalanced, drifting, and
sliding conditions
4. Seismic Design
a. Report SEAOC PV1-2012/ASCE 7-16 SECTION 13.6.12 - Structural Seismic Requirements and Commentary for Rooftop Solar
Photovoltaic Arrays
b. Seismic Site Class: A, B, C, or D (ASCE 7-05/ASCE 7-10/ASCE 7-16)
c. Importance Factor Array (Ip): 1.0
d. Importance Factor Building (le): 1.0
e. Site Class: D
Properties
1. Bay Weight: -3.5 Ibs
2. Module Gaps (E/W) = 0.25 in
3. Bays: North row bays overhang the module by --19.5 inches.
Module Properties
1. Module return flange: Minimum of 0.9in (when using 1-3/4 in. clip bolts) is required.
2. Module return flange: Minimum of 0.65in (when using 2 in. clip bolts) is required.
Page 6 of 9
RESUB
Testing
1. Coefficient of Friction
2. Wind Tunnel
3. U L 2703
4. Component Testing (Bay and Clamp)
Setbacks
For the wind tunnel recommendations in U-Builder to apply, the following setbacks should be observed/followed for
U-Builder wind design:
Jul 15 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
1. Modules should be placed a minimum of 3 feet from the edge of the building in any direction.
2. If the array is located near an obstruction that is 3.5 feet wide and 3.5 feet high or larger, the nearest
module of the array must be located a distance from the obstruction that is greater than or equal to the height of the obstruction.
Exception: When using ASCE 7-16 Building Code and using the obstruction feature in the module editor to accurately model the size and
location of obstruction.
3. Installations within the setbacks listed above require site specific engineering2
4. The setbacks above are for wind. High seismic areas, fire access isles, mechanical equipment, etc.,
may require larger setbacks than listed above for wind.
Site Specific Engineering
Conditions listed below are beyond the current capabilities of U-Builder. Site specific engineering is required.
1. Wind designs for a project design life exceeding 25 years1/ASCE 7-16
2. Building assumptions and design parameters outside of U-Builder assumptions2
3. Attachments2
4. Risk Category III or IV projects (U-Builder can be adjusted for the correct wind, but not the seismic or snow design)2
5. Wind tunnel testing reduction factors are not permitted by the Authority Having Jurisdiction (AHJ)3
6. Seismic designs that fall outside SEAOC PV1-2012/ASCE 7-16 SECTION 13.6.12 recommendations (>3% roof slope, or AHJ's that
require shake table testing or non -linear site -specific response history analysis)3
7. Signed and sealed site -specific calculations, layouts, and drawings3
Notes:
1 Please contact info@unirac.com.
2 Please contact EngineeringServices@unirac.com for more information.
3Please contact Theresa Allen with PZSE Structural Engineers at theresa@pzse.com. These items
will require direct coordination with PZSE to complete the requested services.
Page 7 of 9
RESUB
Jul 15 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
NOTE: Installation of the project is intended to happen within the year of project designed in UBuilder. If it's past one year please DEPARTMENT
rerun the design or contact Unirac Engineering Services.
INSTALLATION AND DESIGN PLAN
Roof Area 1 / Roof Area 1 - Array 1
1
2
3
4
11111:144011
9 2 3 4 5 6
- Module
Standard corner bay with CMU block count
USupplemental bay with CMU block count
NOTE
Blocks above with values greater than 4 require extra ballast bays, except north -most bays which require extra bays for values greater than 6.
The proper number of bays are provided in the Bill of Materials. The installer must install these extra bays as near to the indicated location as
possible.
Install 2 roof pads to every primary bay.
Layout Dimensions
NS DIMENSION - 21.56 ft
EW DIMENSION - 34.68 ft
Page 8 of 9
ROW
MODULES
BAYS
BALLAST BLOCKS (CMU)
BALLAST WEIGHT(LBS)
1
6
13
37
1184
2
6
13
28
896
3
4
13
28
896
4
3
12
21
672
5
0
7
13
416
RESUB
Jul 15 2022
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
Page 9 of 9