HomeMy WebLinkAboutEngineering TURQUOISE Engineering, LLC
Structural Engineering, Design & Testing, CA#28948, NOA#13-0222.02
6915 Washington Rd,W Palm Beach, FL 33405 / Ph(561)804-9908 / Fax( 49907 / e-mail:turginc@aol.com
Jan 04, 2016
TO: St Lucie County/ Building Department
FROM: Riza N. ALTAN, P.E.
SUBJECT: Metal Roof Panel Installation
ADDRESS: Residence for WALLENGREN Enterprises, LLC
7507 San Carlos Dr., Ft Pierce, FL 34947
CONTRACTOR: Larry Neese Roofing, LLC FILE COPY
Dear Sir;
The existing asphalt shingles roof covering of subject residence is proposed to be changed
to metal panels. The purpose of this letter is to determine wind uplift forces and fastening
pattern of proposed Gulf Coast Supply "5V Crimp" metal roof panels.
The subject residence is located in Exposure C area. The roof has 3/12 slope, gable-end
configuration and 12 ft mean roof height. As per 2014 Florida Building Code, ASCE 7-10,
ultimate wind velocity of 165 MPH for Risk Category II, in Exposure C area, using Wind
Load Factor of 0.6 for ASD; the wind pressures are determined as:
Field Pi = -40 psf / Perimeter (4' wide) P2 = -70 psf / Corner (4'x4') P3 = -100 psf.
According to Gulf Coast Supply 24" wide, 26 ga., 5V Crimp Metal Roof Panels (#FL11651.13
R2) the max. design uplift pressures are specified as -94.25 psf using one fastener for
every 12" apart rib, spaced at 16" o.c. vertically in field & perimeter (P1 & P2), and -131 psf
using two fasteners at each rib across the panels at corner (P3) zones spaced at 16" o.c.
It is required that the roof deck is properly re-nailed and covered with direct-deck applied
Titanium PSU 30 (#FL11602-R3) self-adhered underlayment. The roof panels will be
fastened using #12-11/2" Woodgrip fasteners w/ Neoprene washers satisfying FL
specifications. The edge distance for first row of fasteners are 3" max.
Therefore, this letter is to certify that installation of Gulf Coast 5V Crimp (#FL11651.13-R2)
26 ga. steel roof panels of the subject residence conforms to requirements of 2014 Florida
Building Code which specifies 165 MPH ultimate wind velocity for Risk Category II in
Exposure C area.
If you have any questions regarding this matter or I may be of further assistance, please
do not hesitate to call me.
1
Sincerely, IN
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