HomeMy WebLinkAboutMISC EMAILGODWIN ENGINEERING AND DESIGN, LLC
8378 Foxtail Loop, Pensacola, FL 32526 1 (850)712-4219 1 chad(g)godwineng MNNtc
BY
October 29, 2019 St. LUCiP r'
To: St. Lucie County Building Division
2300 Virginia Avenue
Ft. Pierce, FL 34982
Re: Roberts - Residential PV Roof Mount Installation NOV 2 1 ?
6405 Oleander Ave 9
Fort Pierce, FL 34982 ST. Lucie County, Permitting
Plan Reviewer,
This letter is regarding the installation of a new roof mounted Solar PV System on the existing
residential structure at the address above. 1 have reviewed the attachment plan and have
determined that the roof mounted PV system is in compliance with the applicable sections of the
following Codes as amended and adopted by the jurisdiction:
2017 Florida Building Code 61h Edition, FBC
ASCE 7 Min. Design Loads for Buildings & Other Structures
Per 2017 FBC, the Roof Mounted PV system will be subject to the following design criteria:
Design Wind Speed(V it) - 160mph 3sec gust, Exposure Category - C
The PV System consist of the modules, railing, and connection hardware. The system will add a
dead load of approximately 3 psf to the roof.
The existing roof covering is Standing Seam Metal panel with min.'k" plywood decking and 2" x 4"
roof trusses 24" O.C. The roofing, decking, and roof trusses are in good condition. The existing
structure will be adequate for supporting the additional PV dead load and wind loads.
The securement method of the PV system is to be flush mounted to the standing seam metal roof
with the Ironridge railing and flashings/attachments. The attachments are the S-5!-N 1.S can be
attached up to 48" apart in roof zone 1 and 48" apart in roof zone 2. No mounts in roof zone 3. The
mounts should be staggered, where possible, to allow distribution of the design loads evenly to the
structure.
ST UCIE COUNTY
Please see attached documents and contact me should yo REVgW estions. \����►I I I11///7
Sincerely,
D. Chad Godwin, PE 81360
Exp.02/28/2021
FILE Copy
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BUILDING DESIGN PROPERTIES
BASIC WIND SPEED
ROOFPITCH
MEAN ROOF HEIGHT
ROOF SETBACK
ADJUSTMENT FACTOR FOR BUILDING
HEIGHT AND EXPOSURE
TOPIGRAPHICAL FACTOR
EXPOSURE
EFFECTIVE WIND AREA
UNIT
mph Figure 26.5-1C, page 249.
degrees
it
It
sf
Figure 30.5-1, pg 347
Figure 26.8-1, pg 252
ZONEI
ZONE2
ZONES
VARIABLEDESCRIPNON
SYMBOL
VALUE
VALUE
VALUE UNIT
REFERENCE: ASCE 7-10
NET DESIGN WIND PRESSURE (UPLIFT)
P„nn
-42.1 73.4
-108.5 psf
Figure 30.5-1, Fig 346
NET DESIGN WIND PRESSURE (DOWN)
Pne1u
1 20.3
20.3
20.3 psf
Figure 30.5-1, Fig 346
NET DESIGN WIND PRESSURE (UP)
Paiw1
-50.94
-88.81
-131.29 psf
Calculation: P„,,w=Ax K.x Pmn
NET DESIGN WIND PRESSURE (DOWN)
p„u,
1 24.56
psf
Calculation: P,ree„,=1x Kax P,ti
DESCRIPTION
DEAD LOAD
SNOW LOAD
DESIGN WIND LOAD
ASO DESIGN LOAD (UPLIFT)
DOWNFORCE CASE 1
DOWNFORCECA 1!2
DOWNFORCECASE3
24.56
24.56
SYMBOL VALUE VALUE VALUE
D
S
W
paopn
Padw
Nnu.
!`..n
0
1.2999.37327.5621.4
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DESIGN FACTORS & CALCULATIONS FOR THE USE OF L-FOOTANCHORS
DESCRIPTION SYMBOL VALUE VALUE VALUE
MODULE WIDTH
B
TOTAL DESIGN LOAD (UPLIFT)
P
TOTAL DESIGN LOAD(DOWNFORCE)
P
DISTRIBUTED LOAD (UPLIFT)
w
DISTRIBUTED LOAD(DOWNFORCE)
w
RN L SPAN BETWEEN ANCHORS POINTS
L
POINT LOAD (UPLIFT)
It
POINT LOAD(DOWNFORCE)
R
L-FOOT CONNECTED BY 5-51 TO
STANDINGSEAM
Metal roof panel ga.
Set Screw Tension
Ultimate Tensile Load W
Saftey Factor for S-51 Load Test
Design Pullout Value per Mount W,
SAFTEY FACTOR SF
3.43
3.43
3.43
-37.13
-66.47
-99.37
27.56
27.56
27.56
-63.69
-114.00
-270.42
47.27
47.27
47.27
4
4
2
.254.75
-455.99
.340.84
189.08
189.08
94.54
24
24
24
115
115
115
1000
1000
1000
2
2
2
Soo
Soo
Soo
2.96
1.10
1.47
w a,u.re.s..A.yyra.t•..,r.,as
u:va..dz..sw..as.mn..m.mr<a.,.wa.
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L1wxrMnannenl
cml.Is<er(es7.1 /
M
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�M,wtr2nv, � fn4L
11M. L,IINa.(�x M:
i.v uusu xu.n�a.rtrhtra.<n.rao.es••�.
UNIT
psf
psf
psf
pst
Calculation: Pana,= D•SQRT(D.6)W(asd)
pst
Calculation: Pe, 1.0D+1.0S
pst
Calculation: Py, ,=1.OD•1.OW
pst
Calmlation: P,,,= 1.OD•0J5S•0JSW
UNIT
it
PSI
psf
pit Calmlation: w=PB/2•""'"'-
pU Calmlatime w=PB/2 •"""'"'°""'°"'°"
R
His Calculation: R=PLB/2 •"""m..z„�ep..,o.
Ibs Calculation: R=PLB/2 •"""'""a'nnce..e.
In
Ibs S-51 Load Test results
W, = W • 4 of Lags •Td
Calculation: SF=WVR (Uplift)
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•�,�CEps
7f; No :Z
a s �
1 0 sr
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ORION
ONA L Vt' \ ��
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