HomeMy WebLinkAboutSFRA2025-002198Rush Engineering
412 N Rivers Edge Dr
Provo, LIT 84604
ENGINEERING
NWO A =-O&INUMM3EM
I have reviewed the roof framing at above -referenced address to evaluate its structural capacity to support the existing
dead and live or snow loads with the additional loads of the proposed solar PV system. This assessment is based on the
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Applicable Codes: IRC 2021
Load Standard: ASCE 7-16
Risk Category: 11
Wind Speed (3-sec Gust, Mph): 105
Ground Snow Load, Pg (psf): 7
Roof Snow Load, Pf (psf): 5
Roof Live Load (psf): 20
Based on the provided information and the attached calculations which have been done per the codes and loads above, it
is my professional opinion that the existing roof structure is adequate to support the proposed PV system as -is. No
structural modifications or reinforcements are required.
This letter applies only to the areas of the roof directly supporting the PV system and makes no recommendations for any
other parts of the structure. All components used in the installation must be installed per the manufacturer's
specifications.
The fasteners used to attach the solar system to the roof must be staggered to evenly distribute loads over the affected
area, must be spaced according to the maximum attachment spacing shown on the Wind Calculations page, and must be
Wind Calculations page.
Regards, Firm: F-27329
A. Luke Rowley, PE
OF Te
A. LUKE
.......... ...... ......
143240
IAA
06/25/2025
RS1
RS2
RS3
Loads
Loads
Loads
Load Tyg
ftght fPsri
Eces,gr)JUPP
Wei.&t (Pstl
Desigqat,ou
Weight tris!)
pes,gnatron
Rooting Msde�nal
4 'Asphad
Shingle
4___'ASPha!tShing!,,j__4
lAsphalt Shingle
Sheathing: [
1.7
OSB/Piywocid f
17
0SO/Plysvocid j1.7,_j0SB/Plywuod
Framing j
1.5
2X4
1.5
2x4
I.S
12 X4
PV Array.
3
Ponefs-Racking
3
Psmels>Rackingl
3
jPancl,Rack4ig
Dead Load fadjusted to slopoj_!t
11A
Vsf
12,9
fist
11.3
1 psf
Snow.
Root Snow Load(
5
Root Snow Loadl
5
lRoof Snow Load
tivel
20
Pool Uve Load
20
Root Live Load 1
20
Roof Live Load
Total Load on Winch& (Fisb
31A
cof 1
32.9
psf 1
31.3
1 psf
Total Load on Winner (pff).j
62.9
olf 1
65,9
1pit 1
623
j;bt
Member
Member
Member
Proj)erties
Pipperties
f!rlverfia;
Fraimng Tyve.
Trusses
Trusses
Trusses
Member Size:
2x4
2x4
Section Moduius, S 1
3,06
fin-3)
_2X4
frn^3}
3,06
1{±n�3)
Moment of Inertia, 1;�
5,36
(in-41 1
5.36
(ins 14)
5 36
,m-dij
Lumber G,ade,j
DF #2
1
DF #2
OF 92
Modulus of Eiasbcityj
El
1600000,
flps,)
I
1600000
{psi)
1600000
WSO
sparij
7
ftt)
4
Ift)
7
(ft)
Sending
Bending
Sending
Stress
Stress
Stress
Check
Check
Check
Bending, Fb.
900
l(ps?)
900
fpsil 1
900
lips,)
Load DuraVon Factor,
115
1.15
I I
LIS
I
Cd,
Size Factor, Cf,
I'S
1.5
1.5
Repetitive Member
1.15
1.1s
115
Factor, Cr.
A! 3ocvablci Bending,
456
(ft-lbs)
456
(ft-lbs)
456
jlft-lbs}
Applied Bending:
395
(ft-lbs)
132
1
384
lift-lbs)
Shear Check
Shear Check
Shear Check
Shear, FVT
13-0
(Ps') f
ISO
I (psi)
ISO
1ps,j
Area:j
5,25
fin-2)
5.25
(in.2)
525
!o02)
Ailowable, Shear, FvA: I
945
(lbsf i
1#
945
ilbs)
945
(ibs)
ApplFed Sfiear.j
220
1 (lbs)
132
dbij
219
1xbs}
Deflection Check Deflection Check Deflection Check
Totae Load Deftection
L 120
L/120"
L/120
Lirnn:
Allowable Deflection,
0.70
(in)
OA0
Ifirif
030
(,n1
Actual DefieLtion,
O� 164
(M)
0018
(iri;
0164
im)
Live Load Deftechool L/180 L/130 L/ ISO
brmt,i
Allowable Use Load
l OA67 linl 0267 fin) 0.467 (ad
Defectioni
Actual Deflection, 1 0-105 fir') 0011 Lira, 0.017 f m)
lWL'4/18SEO:j
Wind Calculations
Loads & Variables
Code:(
ASCE 7-16
RiskCategorfl
it
Wind Speed: 1
105 mph
Exposure Category:r
8
Structure Type:j
Inhabited Hip
Roof Slope: 1
38
degrees
Mean Roof Height]
20
Ift
Des jgn Wind Pressure
Kz, Exposure Coefficient:! 0,9
Kd, Wind Directionality Factor] 0,85
Ke, Ground Elevation Factor:F-- I
V, Design Wind Speed, mph:! 105
qh - 0,0256*Kz*Kzt*Kd*Ke*V^2A 21.59 psf
Roof Zone: I
Pressure Equalization Factor (Ysi):
External Pressure Coefficient, GCp:
Pressure]
ASD Pressure, 0.6W:i
Horizontal Attach. Spacing (across the eave):
Vertical Attach, Spacing (up the rake):
Tributary Area:
Dead Load:
Max, Load on Attachment:
Roof Zone: I
Pressure. Equalization Factor (Ya):l
GCfl
Pressure:
ASD Pressure, 0.6W:1
Horizontal Attach, Spacing (along eave): I
Vertical Attach. Spacing (along rakej
Tributary Area: I
Dead Load:
Max, Load on Attachment:
,Attachment lift Forces - Portrait Orientation
�a
1
2
3
03
0,7
03
-1A
-2A
-1,8
-21,1
-36,2
-27,6
psf (ASCE 7 Eq, 29,4-7)
-12.7
-213
-1&5
psf
&0
6.0
6,0 If
3,0
3.0
3,0 it
18,0
18,0
18,0 ft12
54,0
54,0
54,0 lbs
-260,2
-423.0
-330,2 fibs
Attachment Uolift Forces - Landscape Orientation
1
2
3
O'S
O's
0,8
-1A
-2,4
-1,8
-24,2
-41,5
-31,6
psf
-14.5
-24.9
-19,0
psf
&0
6.0
ft
1,8
1,8
-6,0
I's
it
10,5
103
10,5
ftA2
31.5
313
31,5
lbs
-171.2
-280A
-218,0
ibs
Mount Capacity Check
Mount Name: EcoFastenCtickfitSmartfoot
Mount Capacity: 1004LO jibs
Applied Load: 423,0 J(bs(no panels inZ3)
Fastener CapAc#ty_Check
Fastener Type: LAG SCREW
Diameter of Fastener:
0.57 in
Number of Fasteners (ea. Attachment):
2
Fastener Embedment Into Structural Member,
IS in
Structural Framing Specific Gravity, G:
05
Safety Factor:
1.5
Load Duration Factor;
1.6
Attachment Pullout Capacity per Inch]
417,5 lbslin
Total Attachment Capacity (with embedment)]
1043.7
lbs
Applied Pullout Load:1
423.0 ibs
1
Maximum Attachment Spacing* 1 72 lin
fbs (no panels in B)