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COVF;R S'I'C~ItY sloped plane on which to install the stand- ing seam metal roof panel. In order for the new clip/post/yurlin comyonents to bond into a structurally sound suyport system, it was necessary for certain bracing members to be incorporated. 'i'bis bracing allows the subframing system to act independent of the covering system in directing the loads into the existing structural system. A standing seam roof panel system was installed on the subframing system. This panel system consisted of 24-gauge Galvahune coated steel, formed into a flat pan panel design with vertical male/female legs spaced at 16 inches on center. These panels were attached to the subframing purlin with the use of concealed fastened cliys, designed to expand and contract in order to accommodate the movement that will be present in the system due to ther- mal changes in the materials. The seams have factory applied caulk, providing a continuous gasket that experiences a con- stant pressure due to the power crimping of all of these joints. The resultant weath- ering surface is a steel surface, yrotected by an aluminum and zinc coating expected to last well vast 45 years, and is gently sloped toward a gutter and downspout system around the entire building. In addition to the new roof system being able to accommodate expected weather and loads, insulatim~ was added in the new cavity to increase the thermal per- formance of the roof and, thus, reduce the energy costs associated with the building. •1'his insulation, consisting of 6 inches of uufaced fiberglass material, was laid on the original roof prior to the installation of the new metal roof panels. To control condensation and allow any moisture in the existing roof to escape, ventilation able to create five air changes per hour was incorporated into the design. James (Buddy) Kiger, assistant superin- tendent of Davidson Cowtty Schools is proud to say the use of this roof system showed "great foresight by the Davidson County school board" While it was initial- ly an attempt to find a more permanent solution to the flat roofs, it has been a per- manent fixture in the commitment to use the school's monetary resources in an effi- cient manner. "~~rith an over S4 million line item in our budget for energy costs, it is important that we provide the best ther- mal package for our buildings," Kiger says. Adding the insulation in the cavity, venting that cavity, and using a roof sur- face to reflect more than 80 percent of the sun's rays, all contribute to minimizing that line item for the school. And, oh yeah, their metal retrofit roofs do not leak! ^ Chuck Houmrd is owner ojrbfetrtl Roof Consrrltmrts of Car}; N.C. He luu designed nad built more thmr 20 million square feet of metal roofing daring the last 30 years, He carr be reached at rlnrckCanreMh•ao(consrrl tarrts.net. ~t~tll ; 2~ ~ _.. Attachment number 2 24 \IE"FAL ROOFING FE6RUARY•/MARCH 2O0G Ledford Higlr Sclrool inspection by Bill Bilger; PE, of Bilger Engineering, arrd loe LnFrtve, president of LnFave's Coash•uction Conrpnrr}; /nc. Ledford High Sclrool(rtbove) in T/ronmsr~ille, N.C., with its new metal retrofrt roof. Below is dre lertky Jlat roojof Ledforrt before the irrstnllrttiou of rt uretrtJ retrofrt roof.