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| Table of Contents(Page DL-52) |
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| Table of Contents(Page DL-52) |
Double-Lok® SPECIAL ERECTION TECHNIQUES
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RECOMMENDED ERECTION PRACTICES CORRECTING OUT-OF-PLANE SUBSTRUCTUREOccasionally a purlin may be encountered that is lower (out-of-plane) than those adjacent to it. When a clip is attached to this purlin, it will go down further than those adjacent to it, distorting the seam. This can cause the next panel sidelap to be difficult to lap together in this area. To compensate for this lower purlin, a steel shim may be placed under the clip to bring it up to the proper height (in plane). This shim should be no thicker than 1/4". If 1/4" is not enough, then structural modification will be necessary. Avoid "stair-stepping" of the panels at the eave. This will cause problems engaging back-up plates at the endlap and ridge. Any "stripped out" fasteners at the endlaps or outside closures should be immediately replaced with Fastener #2A. Place a 1" long piece of tri-bead tape sealer over the "stripped out hole before installing Fastener #2A. This will allow the fastener threads to be coated with tape sealer and provide a good seal. NEVER ALLOW PANELS TO COME INTO CONTACT WITH LEAD, COPPER, GRAPHITE, GASOLINE OR OTHER HARSH CHEMICALS AS THIS WILL VOID THE GALVALUME® WARRANTY. CHECK ROOF FOR PANEL ALIGNMENTCheck the roof every three or four runs for panel alignment as it is being erected. This can be accomplished by two different means. 1. Measure from the rake support to the seam of the last completed panel run. Take measurements at the ridge, eave, and all endlaps.2. Attach a stringline to the eave plate and ridge purlin, running parallel to the rake support. The stringline should stay ahead of the work and can be moved across the roof as construction progresses. Measure from the stringline back to the last completed panel run. Take measurements at the ridge, eave, and all endlaps. |
