In all applications where new panels are fastened over the existing panels, proper waterproofing of the seams is required. Additional structural supports are required to span the purlins at each side of the penetration. The sides of the collar are attached to a flashing that is seamed into the panels. These penetrations are sealed with a two-piece collar. Penetrations larger than 18 inches in diameter require special installation procedures. Pipe boot installation is similar to typical penetration details. Additional structural supports are required to span between the purlins on each side of the penetration. The lower part of the seamed panel must also be field-notched to secure around the rib of the adjacent lower panel. The new seamed metal panel is field-notched at the location of the penetration and end-lapped. At these locations, factory-fabricated, doublewide metal panels are seamed into the adjacent metal panels. In remedial construction installations, penetrations may occur at or near metal ribs. The pipe boot installation procedures are similar to the other details: Sealant is applied between the boot flange and the metal surface prior to fastener attachment. In situations where the existing penetration is in place and the metal panels cannot be set over it, the new panels may lap around the penetration and a specially designed retrofit pipe boot should be installed over the existing penetration. This application detail is acceptable on all penetrations that are located within the flat part of the panel and can be completed on new and remedial roofing applications.
Sealant is applied between the metal panel surface and the metal flange of the pipe boot before fastening the flange to the surface. The boot should be set over the penetration and installed onto the metal surface. In addition, the manufacturer’s criteria should always be reviewed prior to any application procedures.Ī typical pipe penetration in the field of a metal panel is completed with a flexible bellow-type boot. These are additional points where moisture can enter into the facility. In architectural panels with underlayment, it is critical that all penetrations through the felt are detailed as extensively as penetrations through the metal. When eliminating these types of penetrations is not feasible, the penetrations and openings should be carefully detailed to allow for both panel movement and elimination of moisture intrusion. These cuts can restrict temperature expansion, expose the metal to corrosion and lead to leaks. Every roof penetration or opening results in cuts in the field of the metal panels. Penetrations Proper roof design on low-slope standing-seam metal systems should limit the amount of pipes, ducts and openings for rooftop-mounted equipment.
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