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(561)8049907 / e-mail:turqinc@aol.com
June 28, 2016
TO: St. Lucie County/ Building Department
FROM: Riza N. ALTAN, P.E.
SUBJECT: Wind Pressures & Metal Roof Panel Installation
ADDRESS: GERSONY Residence/ 9533 W Angle Rd, Ft Pierce, FL 34947
CONTRACTOR: Larry Neese Roofing
Dear Sir;
The installation specifications of metal roof panels for the subject residence is reviewed by
myself. The purpose of this letter is to determine wind uplift forces and fastening pattern
of Gulf Coast Supply "5V Crimp" metal roof panels.
The residence is located in Exposure C area. The roof has 1.6112 slope, and 15 ft mean
roof height. As per 2014 Florida Building Code, ASCE 7-10, ultimate wind velocity of 160
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 = -44 psf / Perimeter (4' wide) P2 = -74 psf / Corner(4x4) P3 = -111 PSf.
According to Gulf Coast Supply & Manufacturing, LLC; 36" wide, 26 ga., 5V Crimp Metal
Roof Panels (FL#11651.12-R2) the max. design uplift pressures are specified as -108.5 psf
using one fastener for every rib, spaced at 12" o.c. vertically in field (PI) and perimeter (P2)
zones; and -156.5 psf using one fasteners at each rib, spaced at 6" o.c. at corner (P3)
zones. Due to low slope of 1.5 /12; Lap-sealants are required to be used.
It is required that the roof deck is covered with self-adhering Titanium PSU30 underlayment
and back-nailed using Simplex nails and plastic tags. The roof panels will be fastened
using #9-15 1112" Woodgrip fasteners w/ Neoprene washers spaced at 12" o.c. in field and
perimeter; and 6" o.c. in corners. The distance for first row of fasteners from panel edges
will be 3" max.
Therefore, this letter is to certify that installation of Gulf Coast 5V Crimp(FL#116s1MA2)
26 ga. 5V Crimp steel roof panels of the subject residence conform to requirements of 2014
Florida Building Code which specifies 160 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.
Sincerely, At
1,J
8521
Riza N. ALTAN, P.E. #38 1 Z
Consulting Engineer STA-i t_OF
gyp,'• A10WV
,0t,, it I 81ON A,/