HomeMy WebLinkAboutENGINEERING PAPERWORKGODWIN ENGINEERING AND DESIGN, LLC
8378 Foxtail Loop, Pensacola, FL 32526 1 (850)712-4219 1 chad(a)godwineng.com
April 15, 2019 ST.LUCIE COUNTY
PLAN REVIEW
To: St. Lucie County Building Division
FILE COPY
BLDG:
2300 Virginia Avenue
DATE:
Ft. Pierce, FL 34982
ELE#i
Re: Joseph - Residential PV Roof Mount Installation
DATE: yIi
2806 Kingsley Drive
PLUMB:
Fort Pierce, FL 34946
DATE:
SCANNED
MECH:
BY
DATE:
Plan Reviewer,
St. Lucie County
This letter is regarding the installation of a new roof mounted Solar PV System on the existing
residential structure at the address above. I 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 6th 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 Asphalt Shingle with min.'h" 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 asphalt shingle roof with the
Ironridge railing and flashings/attachments. The attachments can be attached up to 48" apart. The
mounts should be staggered, where possible, to allow distribution of the design loads evenly to the
structure. The mounts shall be installed with a min. 5/16" lag screw with minimum 2-5/16" thread
length.
Please see attached documents and contact me should you have any questions.
Sincerely,
D. Chad Godwin, PE 81360
Exp.02/28/2021
BUILDING DESIGN PROPERTIES
SYMBOL VALUE
UNIT
BASIC WINO SPEED
V
160 L:
mph
Figure 26.5-1C, page 249a
ROOF PITCH
B
>) to 1)
w degrees
MEAN ROOF HEIGHT
h
15
ft
ROOF SETBACK
a
3
ft
ADJUSTMENT FACTOR FOR BUILDING
HEIGHT AND EXPOSURE
1
1.21
Figure 30.5-1, pg 347
TOPIGRAPHICALFACTOR
K
-. 1
Figure 26.8-1, pg 252
EXPOSURE
C (-
EFFECTIVE WIND AREA
10
sf
ZONE1
ZONE2
ZONE3
VARIABLE DESCRIPTION
SYMBOL
VALUE
VALUE .
.VALUE .UNIT
REFERIENIM ASCE 740.
NET DESIGN WIND PRESSURE (UPLIFT)
P.,oa
-42.1
-308.5
Par
Figure 30.5.1, pg ME
NET DESIGN WIND PRESSURE (DOWN)
P..
20.3
20.3
20.3
psf
Figure 30.5.1, pit ME
NET DESIGN WIND PRESSURE [UP
P",,"p
-50.94
--73.4
88.8
-131.29psf
Calculation: P,,,� up 1x Knx P.,ua
NET DESIGN WIND PRESSURE (DOWN)
P,m a..,.
24.56
2116
iA.56
psf
CPlcolatlon: P,,,, m,.=Ax Knx P,,,,,a
DESCRIPTION
DEAD LOAD
SNOW LOAD
DESIGN WIND LOAD
ASD DESIGN LOAD (UPLIFT)
DOWNFORCE CASE I
DOWNFORCE CASE 2
DOWNFORCE CASE 3
DESCRIPTION
MODULE WIDTH
TOTAL DESIGN LOAD (UPLIFT)
TOTAL DESIGN LOAD (DOWNFORCE)
DISTRIBUTED LOAD (UPLIFT)
DISTRIBUTED LOAD (DOWNFORCE)
RAIL SPAN BETWEEN ANCHORS POINTS
POINT LOAD (UPLIFT)
POINT WAD (DOWNFORCE)
L-FOOT CONNECTED BY LAG SCREW TO
ROOF TRUSS/RAFTER
Specific Gravity, Rafter
Min. Via. of lag Screw, 5/16
Pullout Value of
It Of Lag screws
Thread Length
Design Pullout Value per Mount
SAFTEYFACTOR
SYMBOL VALUE VALUE VALUE
D
S
W
Pae,o'
vaam
Pa..w
Pan,P
3
0
31.2999.3737.5621.42
N21.4
SYMBOL VALUE VALUE VALUE
B
P
P
w
W
L
R
R
G
D
W
T.
W,
SF
3.28
3.28
3.28
-37.13
-66.47
-99.37
27.56
27.56
27.56
-60.90
409.01
-162.97
45.20
45.20
45.20
4
. 4
4
-243.6
-436.05
-651.86
180.81
180.81
180.8
0.55
0.55
0.55
0.3125
0.3125
0.3125
306.87
306.87
306.87
I
1
1
2.3125
2.3125
2.3125
709.64
709.636
709.636
Z91
2-63
L09
asa a,u,wrsagia.pn•�n
Y.wwu.�s0�)r�1rl'nq Pd•.W �
L1MScnatlo11M3
Nl�•a1 FVL,IM66Q. w1a1w./�
F4t Ilm!
GWNIIeMLP{T7
UNIT
psf
psf
psf
PO
Fast
Re
psf
UNIT
It
psf
I'd
PH
pit
In
Has
Ups
Calculation: Pa ,t„=D+5pRT(0.6)W (asd)
Calculation: P4n4=1DD+1.o5
Calculation: Paay"=1.OD+1.OW
Calculation: Pa„,,= IADQ.7SS+0.75W
[almlation: w=PB/2'x""'""x,,,ece„�+
Calculation:w=PB/2 •"4"�za,ece•,,,.
Calculatiom. R = PUV2'"vineQ 1i�r"-
Calculation: R = PLB/2'"54'm61
Table 11.2A, NDS 2005, page 68 (Southern Pine)
In
Ibs/in W=180D GmDV4
In Table 12, NDS 2005
W, = W' K of Iags'Ta
Calculation: SF=WVR (Uplift)
Nu�v2w, ED WIDre, -•• ,. Ca,w imt
NX
N\A\0e c.Ia //,
.y
81360
=tea
-�.
iQa OF : ��
\ CNAL