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717 846 - 3747 Fax 717- 846 -0355 <br /> HR Engineering, Inc. <br /> 1418 E. Market St., Suite B <br /> York, PA 17403 <br /> 14 March 2007 <br /> Bill Van Laarhovun <br /> Metal Structures <br /> 7329 Land 0 Lakes Boulevard <br /> Land 0 Lakes, FL 34639 <br /> RE: Fabral GrandBeam Metal Roofing <br /> Dear Mr. Van Laarhovun; <br /> At the request of Fabral, I am writing this letter concerning the installation of their <br /> GrandBeam metal roofing panels on buildings located in Palm Beach County, Florida. <br /> Fabral installation instructions require that GrandBeam be installed on a minimum slope <br /> of 3" to 12 ". The roof slope of all buildings using GrandBeam must comply with this <br /> minimum requirement. <br /> Recently, in accordance with 2006 Supplement to the 2004 Florida Building Code <br /> Section 1504.3.2, testing was performed to UL 580 on the GrandBeam at Architectural <br /> Testing, Inc. This is ATI project 70328.01- 109 -44, and their test report bears that <br /> number. The specimen consisted of 26 gage steel panels installed with Fabral's standard <br /> fasteners and in accordance with their "Design Manual" on supports spaced at 4 feet. <br /> The roofing achieved a UL rating of Class 90 and enhanced value 135.0 psf uplift. Using <br /> the usual factor of safety equal to 2.0 for roofing, the GrandBeam achieved an allowable <br /> design wind load rating of +/ -67.5 psf. <br /> Utilizing 2006 Supplement to the 2004 FBC Figure 1609, the maximum basic wind speed <br /> for Palm Beach County will be 140 mph, and Table 1609.6.2.1(2) requires a maximum <br /> wind pressure uplift of 56.2 psf for roof zones 1 and 2, with a maximum uplift pressure of <br /> 83.1 psf for roof zone 3 (near Corners). From the above, the standard GrandBeam <br /> installation, with supports spaced at 4 feet, is adequate for roofs in zones 1 and 2. For <br /> zone 3, the support spacing must be a maximum of 2 feet. I trust that this adequately <br /> covers the installation of GrandBeam. If there are any questions, or if anything additional <br /> is required, please advise me. <br /> Sincerely yours; <br /> Allen N. Reeves, PE <br /> Florida License No. 19354 <br /> �f /"1ARcN 2 oe7 <br /> ANR:anr <br /> Cc: 07030008 -2 file & Fabral <br />