B23-0970 - 32073 VIA TONADA 20FINAL
11/01/2023
B23 0970
07 2303
14 MODULES
DC
4.06kW AC
NO MPU/BBU
43,581.21
20
Attn.: To Whom It May Concern
re job:
The following calculations are for the structural engineering design of the photovoltaic panels and are
valid only for the structural info referenced in the stamped plan set.
All mounting equipment shall be designed and installed per manufacturer's approved installation
specifications.
Design Criteria:
Current Renewables Engineering Inc.
Professional Engineer
info@currentrenewableseng.com
08-18-2023
Page 1 of 8
08-18-2023
Powur PBC
2683 Via De La Valle #321G, Del Mar, CA 92014
Terry Valles
32073 Via Tonada, San Juan Capistrano, CA 92675, USA
I certify that the roof structure has sufficient structural capacity for the applied PV loads.
Code: 2022 CBC, ASCE 7-16,
Live Load: 20 psf
Ult Wind Speed: 110 mph
Exposure Cat: C
Ground Snow: 0 psf
Min Snow Roof: N/A
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
DIANNA F.08/29/23B23-0970
SUBJECT TO FIELD INSPECTION
Roof Properties:
Roof Type =
Roof Pitch (deg) =
Mean Root Height (ft) =
Attachment Trib Width (ft) =
Attachment Spacing (ft) =
Framing Type =
Framing Size =
Framing OC Spacing (in.) =
Section Thickness, b (in) =
Section Depth, d (in) =
Section Modulus, Sx (in3) =
Deflection Limit D+L (in) =
Deflection Limit S or W (in) =
Framing Upgrade =
Sister Size =
Wood Species =
Wood Fb (psi) =
Wood Fv (psi) =
Wood E (psi) =
CD (wind) =
Cd (snow) =
CLS =
CM = Ct = CL = Ci =
CF =
Cfu =
Cr =
F'b wind (psi) =
F'b snow (psi) =
F'v wind (psi) =
F'v snow (psi) =
M allowable wind (lb-ft) =
M allowable snow (lb-ft) =
V allowable wind (lbs) =
V allowable snow (lbs) =
E' (psi) =
Moment of Inertia, lx (in ) =
Unsupported Span (ft) =
Upper Chord Length (ft) =
Page 2 of 8
Shingle
23.0
13.0
3.25
4.0
Rafter
2x6
16.0
1.5
5.5
7.562
20.797
18.0
3.6
2.4
No
NA
DF
900.0
180.0
1600000.0
1.6
1.15
1.0
1.0
1.3
1.0
1.15
2152.8
1547.32
288.0
207.0
1356.71
975.14
1584.0
1138.5
Roof 1
1600000.0
18.0
Terry Valles
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
Load Calculation:
Dead Load Calculations:
Panels Dead Load (psf) =
Roofing Weight (psf) =
Decking Weight (psf) =
Framing Weight (psf) =
Misc. Additional Weight (psf) =
Existing Dead Load (psf) =
Total Dead Load (psf) =
Wind Load Calculations:
Ultimate Wind Speed (mph) =
Directionality Factor, kd =
Topographic Factor, kzt =
Velocity Press Exp Factor, kz =
Velocity Pressure, qz (psf) =
External Pressure Up, GCp_1 =
External Pressure Up, GCp_2 =
External Pressure Up, GCp_3 =
External Pressure Down, GCp =
Design Pressure Up, p_1 (psf) =
Design Pressure Up, p_2 (psf) =
Design Pressure Up, p_3 (psf) =
Design Pressure Down, p (psf) =
Snow Load Calculations:
Ground Snow Load, pg (psf) =
Min Flat Snow, pf_min (psf) =
Sloped Snow, ps_min (psf) =
Snow Importance Factor, Ic =
Exposure Factor, Ce =
Thermal Factor, Ct =
Flat Roof Snow, pf (psf) =
Slope Factor, Cs =
Sloped Roof Snow, ps (psf) =
Page 3 of 8
3.0
3.0
2.0
1.418
1.0
7.418
10.418
110.0
0.85
1.0
0.849
22.351
-1.5
-2.167
-2.453
0.465
-23.133
-33.423
-37.83
16.0
Roof 1
0.0
0.0
0.0
1.0
0.9
1.1
0.0
1.0
0.0
Terry Valles
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
Attachment Type =
Allowable Up Force (lbs) =
Allowable Down Force (lbs) =
Allowable Side Force (lbs) =
Applied Uplift Force (lbs) =
Uplift DCR =
Applied Down Force (lbs) =
Down DCR =
Applied Lateral Force (lbs) =
Lateral DCR =
Attachment Checks:
Page 4 of 8
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
Roof 1
-134.521
0.641
133.045
0.634
15.239
0.133
Deck Mount
210.0
210.0
115.0
Terry Valles
Roof Framing Checks:
LC1: D+S
Force Checks:
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
LC2: D+0.6W
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
LC3: D+0.75(S+0.6W)
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
LC4: 0.6D+0.6W
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
Page 5 of 8
Terry Valles
563.0
124.0
975.0
1138.0
0.577
0.109
Roof 1
1081.0
239.0
1357.0
1584.0
0.797
0.151
951.0
210.0
1357.0
1584.0
0.701
0.133
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
856.0
189.0
1357.0
1584.0
0.631
0.12
LC2: S
LC3: W (Down)
Deflection Checks (Service Level):
LC1: D+L
LC4: W (Up)
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
Page 6 of 8
3.737
3.6
1.038
0.0
2.4
0.0
0.636
2.4
0.265
0.92
2.4
0.383
Terry Valles
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
(Existing W + Additional W)/(Existing W) =
Weight Increase:
Existing Weight:
Total Additional PV Weight (lbs) =
Seismic Check:
The increase in weight as a result of the solar system is less than 10% of the existing structure and therefore
no further seismic analysis is required.
Wall Weight (psf) =
Tributary Wall Area (ft2) =
Total Wall Weight (lbs) =
Roof Weight (psf) =
Roof Area (ft2) =
Total Roof Weight (lbs) =
Total Existing Weight (lbs) =
Page 7 of 8
17.0
1750.0
29750.0
7.418
7600.0
56376.562
86126.56
900.9
1.01
Terry Valles
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
Limits of Scope of Work and Liability:
The calculations produced are only for the roof framing supporting the proposed PV installation
referenced in the stamped planset and were completed according to generally recognized structural
analysis standards and procedures, professional engineering and design experience, opinions and
judgments. Existing deficiencies which are unknown or were not observable during time of inspection
are not included in this scope of work. This analysis is not stamped for water leakage. Prior to
commencement of work, the contractor shall verify the framing sizes, spacings, and spans noted in the
stamped plans, calculations, and cert letter (where applicable) and notify the Engineer of Record of any
discrepancies prior to starting construction. Contractor shall also verify that there is no damaged framing
that was not addressed in stamped plans, calculations, and cert letter (where applicable) and notify the
Engineer of Record of any concerns prior to starting construction.
Page 8 of 8
Terry Valles
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
Current Renewables Engineering Inc.
Professional Engineer
info@currentrenewableseng.com
Design Criteria:
Subject: Structural Certification for Installation of Residential Solar
re job:
Attn.: To Whom It May Concern
Observation of the condition of the existing framing system was performed by an audit team of
After review of the field observation data, structural capacity calculations were performed in accordance
with applicable building codes to determine adequacy of the existing roof framing supporting the proposed
panel layout. Please see full Structural Calculations report for details regarding calculations performed and
limits of scope of work and liability. The design criteria and structural adequacy are summarized below:
08-18-2023
08-18-2023
Powur PBC
Terry Valles
Powur PBC
ROOF 1: Shingle roofing supported by 2x6 Rafter @ 16 in. OC spacing. The roof is sloped at
approximately 23 degrees and has a max beam span of 16.0 ft between supports. Roof is adequate
to support the imposed loads. Therefore, no structural upgrades are required.
Code: 2022 CBC, ASCE 7-16, Ult Wind Speed: 110 mph, Exposure Category: C , Ground Snow: 0
psf, Min Snow Roof: 0 psf
1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
2683 Via De La Valle #321G, Del Mar, CA 92014
32073 Via Tonada, San Juan Capistrano, CA 92675, USA