b'ARCHITECTURAL SHEET METALContinued from page 8Next, lay down double- or triple-bead tape seal onCURBStheeavetrim,thenfastenthroughthepanelintoThe most difficult place to make a low-slope metal the eave trim or 16-gauge offset cleat to get a goodroofwatertightisonacurb. Ateverycurb,there compressionsealwiththefastenersoverhangingare a minimum of four end laps. Fortunately, there the gutter (Figures 8 - 9). is a way to eliminate these end laps. On the roof in Figure 11, there were nearly 700 panel end laps with around100occurringaroundcurbpenetrations. The overall panel length was nearly 250 feet.Figure 8Figure 11The roof in Figure 12 was recovered with zero end laps! This is because of the use of variable-width, site-formed, vertical-ribbed panels and transverse panelsuphillofalllargecurbpenetrations. Figure 9 Transverse panels are not new, but they are seldom used. Transverse panels can be used to eliminate RIDGE CONDITION ALL end laps on a low-slope metal roof. In order to best utilize them, two panel widths can be used In regard to ridge conditions on low slope roofs: if atoensurethatthepanelseamlandsascloseas vertical rib panel is used, then take the opportunitypossible to an existing curb penetration. Figure 12 to bread-pan it behind the closure (Figure 10). Thisshows the use of both 24 and 18 panels, which ischeapinsuranceagainstleaks.Itcanbedoneland the seam within 6 of the curb.without cutting the panel seam.Figure 12Figure 10Installingtransversepanelsisprettysimple. Continued on page 1210 www.mrca.orgMidwest Roofer'