HomeMy WebLinkAboutLA226237-APPROVED-Nalla Plans8/6/2024
Freedom Forever LLC
43445 Buisiness Park Dr., Suite 110
Temecula, CA 92590
Job Number:450897
Project Name:Surendra Nalla
Project Address: 9060 179th St W
City:Lakeville
State:MN
Design Criteria:
Applicable Code =
Design Wind Speed =
Exposure Category =C
Ground Snow Load =
Module Type =
Module Quantity =20
To whom is may concern,
Sincerely,
Taqi Khawaja, PE
Freedom Forever LLC
62 psf
109 mph (3 Second Gust)
2018 IBC/IEBC, 2018 IRC, ASCE 7-16
The above mentioned residential rooftop solar project has been designed to the specifications shown
above. The team at Freedom Forever LLC has visited the site to observe the roof and its framing as
well as gather other required information for the project. During this observation they did not see any
signs of damage or distress to the roof structure which would preclude solar from being installed.
Based on that review and the information provided, the calculations on the following pages were
completed to determine the adequacy of the roof framing as well as the allowable attachment spacing
for the PV panels. The calculations show that the roof can support the proposed PV system.
HANWHA QCELL: Q.PEAK DUO BLK ML-G10+ 410
Wind Calculations
Pressures based on Section 29.4.4
p = qh(GCp)(γE)(γa)
Kz =0.98
Kzt =1.0
Kd =0.85 ASCE7 Table 26.6-1
qz =25.4 psf
GC Wind GC Wind GC Wind GC Wind GC Wind
1 -1.48 -37.46 -1.49 -37.73
2e -1.48 -37.46 -1.49 -37.73
2r -1.75 -44.45 -2.14 -54.37
2n -1.75 -44.45 -2.14 -54.37
3r -2.16 -54.98 -2.41 -61.30
3e -2.16 -54.98 -2.14 -54.37
Down 0.77 19.53 0.46 11.75
GC Wind GC Wind GC Wind GC Wind GC Wind
1
2e
2r
2n
3r
3e
Down
Mounting Plane
Zone
543
6
Mounting Plane
Zone
2
10987
1
𝑞ℎ=.00256 ∗𝐾𝑧∗𝐾𝑧𝑡∗𝐾𝑑∗𝑉2
Snow Load Calculations
Flat Roof Snow Load based on Section 7.3
pf = 0.7CeCtIspg
pg =62 pf =47.74
Ce =1.00
Ct =1.10
Is =1.0
Cs Snow Cs Snow Cs Snow Cs Snow Cs Snow
0.60 28.64 0.73 35.01
Cs Snow Cs Snow Cs Snow Cs Snow Cs Snow
Load Combinations
Dead Load =3 psf EM = Edge Module IM = Interior Module
Uplift γE=1.5 γa=0.55 per Figure 29.4-8
0.6D + 0.6W (psf)EM IM EM IM EM IM EM IM EM IM
1 -16.76 -10.58 -16.90 -10.67
2e -16.76 -10.58 -16.90 -10.67
2r -20.23 -12.88 -25.14 -16.16
2n -20.23 -12.88 -25.14 -16.16
3r -25.44 -16.36 -28.58 -18.45
3e -25.44 -16.36 -25.14 -16.16
0.6D + 0.6W (psf)EM IM EM IM EM IM EM IM EM IM
1
2e
2r
2n
3r
3e
Mounting Plane
Zone
9
7
Roof Snow Load (psf)
1 2 3Mounting Plane
Mounting Plane
Mounting Plane
5
6
6 7 8
2
4
Roof Snow Load (psf)
4 5
Zone
8
10
9 10
31
Down Force
EM IM EM IM EM IM EM IM EM IM
D+S (psf)22.17 22.17 30.98 30.98
D+06W (psf)12.17 8.94 8.52 6.58
EM IM EM IM EM IM EM IM EM IM
D+S (psf)
D+06W (psf)
Lateral Parallel to Roof
D+S (psf)
D+S (psf)
Framing Check
DF
PV Load =3 psf
Moment (lb-ft)
Framing Spacing (in)
3
Mounting Plane
Mounting Plane 3
10Mounting Plane
Mounting Plane
8
Module Location
Lumber Species:
54
Mounting Plane
Module Location
4 5
Span (ft)
Mounting Plane 6 7 8 9 10
Framing Size
Framing Spacing (in)
Span (ft)
% Stressed
Shear (lbs)
Moment (lb-ft)
2x4
24
5.25
201
153
44%
Framing Size
5.25
262
199
57%
2
24
9
2x4
4 5
1
Upgrade Size NA
New % Stressed NA
NA
1
6
NA
14.96
7 8 9 10
15.11
1 2
6 7
2 3
% Stressed
Shear (lbs)
Upgrade Size
New % Stressed
Array Attachment Spacing
Module Model =
Module Quantity =20
HANWHA QCELL: Q.PEAK DUO BLK ML-G10+ 410
Mounting Plane 1 2 3 4 5
Portrait
Max Spacing (in)24 24
Attachment Type Ecofasten RockIt
Smart Slide
Ecofasten RockIt
Smart Slide
Landscape
Max Spacing (in)48 48
Landscape
Max Spacing (in)
Portrait
Max Spacing (in)
Mounting Plane 6 7 8 9 10
Attachment Type
Min Lag Embedment (in)
2 2
Lag Count Per Attachment
Lag Count Per Attachment
Min Lag Embedment (in)
2 2