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Structural Engineering, Design & Testing, CA#28948, NOA#13-0222.02
6915 Washington Rd,W Palm Beach, FL 33405/Ph. (561)804-9908/Fax(561)804-9907/e-mail:turqinc@aol.com
June 29, 2016
TO: St Lucie County/ Building Department
FROM: Riza N. ALTAN, P.E.
SUBJECT: Wind Uplift & Flat Re-Roofing Specifications
ADDRESS: ROLLE Jr Residence/ 1603 N 33rd Street, Ft Pierce, FL 34947
CONTRACTOR:Larry Neese LLC, Roofing & Waterproofing
Dear Sir;
The re-roofing specifications for flat areas of the subject residence have been reviewed
by myself. The purpose of this letter is to determine the wind uplift pressures and
specify attachment of self-adhered base sheet.
The existing 10'x19' flat roof is located in Exposure C area at mean roof height of 15 ft.
The roof consists of 5/8" CDX plywood deck, having positive drainage. Roof design
pressures; as per 2014 Florida Building Code, ASCE 7-10, 160 MPH ultimate Wind
Velocity for Risk Category II in Exposure C area, using Wind Load Factor Of 0.6 for ASD;
are determined as follows:
Field Pi = -44psf / Perimeter (4' wide) P2= -74 psf / Corner (4'x4') P3= -111 PSf.
The proposed Pollyglass Self-Adhered Bitumen Roof System over Wood Decks
(#FL1654-RI9) consists of sealed plywood seams using 4"wide Pollyflex SAN tapes
followed by rolled-pressed Polyflex SA Base base sheet and self-adhered PolyFlex G
cap sheet.
The max. design pressure of-135 psf (Wood Deck, Non-Insulated, Table IG, Syst Type F,
Syst#W-1 41, pg. 22/45) is determined to satisfy roof uplift pressures in all roof zones.
Therefore, this letter is to certify that installation of Polyglass Self-Adhered Roof System
(WIL1654-11119) with self-adhered cap sheet over wood decks, as described above,
conforms 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,
o
S. AJr
Riza N. ALTAN, P. # 521 ,.o" 'N
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Consulting Engineer
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