b'ARCHITECTURAL SHEET METALContinued from page 12Figure 6Installation of the 24-gauge Galvalume symmetrical panels.Figure 7A 24-in.-wide frameless symmetricalre-coversystemwith wind clamps in corner zone per FM requirements.Brown recalled the new frameless re-cover system using a symmetrical standing-seam panel. Instead of using a sub-purlin or hat sections, the system uses tall clips that sit down between the ribs of the existing panel and are attached through to the purlin below. The clips hold the new panel above the ribs of the R-panel, eliminating the need for a sub-frame. Like the system used on the barrel roof, this system can be installed with 100-percent continuous clips toMetal installed the roof panels on the three hangars meet the wind uplift at 5-ft.-on-center frame spacing.in less than two months. Project Manager, Jerry The use of continuous clips offers nearly three timesHiltibidal, estimated the project could have taken greater uplift resistance than standard clips. Thealmost twice as long if they had installed sub purlins frameless system eliminates the time and expenseand a new standing-seam re-cover system. To execute of installing sub-purlins and would fall within thea complete tear-off and reroof would have been even parameters of the owners budget.longer and, again, an inconvenience to tenants. The Lafayette Regional Airport Commission submittedThis was definitely the quicker and more economical the new system to FM for approval, explaining thatsystem install, Hiltibidal says. The continuous clips fundswerenotavailabletoinstallthealready- allowed us to achieve the wind uplift requirements approved notched sub-purlin system used on otherand install the panels without sub-purlins. The clips buildings. FM approved the system for use on therun alongside the panels and serve as a base for the T-hangars with the addition of wind clamps in thepanels. They attach to the original existing purlins of corner zones.the metal building. Each T-hangar measured 58 x 331 ft., or 19,198 sq.The other big advantage to installing this frameless ft., for a total of 57,594 sq. ft. Most roofing panelssymmetrical panel system is that it provided a safe measured about 30 ft. in length. Like all other re- platform to work on. Tearing off a roof and working covers at the airport, the 24-gauge Galvalume panelson open purlins is definitely a safety challenge. (Figures 6&7) were polyvinylidene difluoride-coatedThis new frameless system made everyone happy, in Regal White to take advantage of that colorsBrown says. The elimination of the sub-purlins reflective qualities. Batt insulation was installedsaved time and expense on installation. We kept between the original roof and the new system in thethe occupants and contents of the buildings covered fields, and a polyiso insulation was added on thewith minimal disturbance, and we came in well under perimeter. The rigid insulation provided additionalbudget.support at the roof edge.The new system went up very fast, Brown says. The panels were 24 in. wide, so the installer could really move. Panels run continuously from the eaves to a double row of vented ridge caps. Crown Architectural 14 www.mrca.orgMidwest Roofer'