HomeMy WebLinkAboutEngineering RECEI`,1'_7D JUL
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)804-9907/e-mail:turginc@aol.com
July 18,2016
TO: St Lucie County/ Building Department
FROM: Riza N. ALTAN, P.E.
SUBJECT: Wind Uplift & Flat Re-Roofing Specifications
ADDRESS: FORTINI Residence/8201 Penny Ln., Ft Pierce, FL 34951
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 24'x12' flat roof is located in Exposure C area at mean roof height of 15A
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 = -44 psf / Perimeter (4' wide) P2= -74 psf / Corner (4'x4') P3= -111 psf:
The proposed Polyglass Self-Adhered Bitumen Roof System over Wood Decks
(#FL1654-R19).consists of sealed plywood seams using 4" wide Polyflex SA-V.tapes
followed by rolled-pressed Polyflex SA Base base sheet and heat-welded PolyFlex G
granule cap sheet.
The max. design pressure of-135 psf (Wood Deck, Non-Insulated, Table 1G, Syst Type F,
Syst#W-142; 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
(#FL1654-R19) with torch-applied 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,
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Riza N. ALTAN .E.:. 3$521 No.38521
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