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TOPIC: Flashing

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Want to install a new standing seam panel roof over my existing porch. I'm a little confused as to how I might be able to flash the connection at the top of the roof where it meets the second floor exterior wall of the home. I live in NJ, and I am within a mile of the coast so we do experience some harsh storms. I will be installing Ice and water shield over the entire deck of the roof, so any leakage will never damage the sheathing, but would like to know how to do this properly. I would also like to be able to bend my materials prior to installing my roofing so I can stand on the existing roofing when residing the second floor and not damage the new materials on the roof. Thanks ahead of time for any help Andy B
Guest User

12/3/2004
Ultimately, the exact flashing will be determined by exactly what profile of roof you install. The manufacturer of the roofing should be able to give you a detail on this sort of "topwall" flashing. However, it is good that you're re-siding. The new flashing should be put in place before the siding is installed. If everything is measure just right, you can probably install the flashing, then the siding, then the roofing. The flashing should extend up behind the siding by 6" or more. It must be mounted high enough on the wall that, when it comes out over the roofing, it does not get forced into a negative (reverse) pitch. The flashing should come out over the roofing by 6" or so and have a closed hem on it. Before the standing seam panels are puhed up under the flashing, Z Channel should be riveted to the panels between the seams and sealed with a quality sealant. After the panels are pushed up under the flashing, you will probably wnat to "pin" the top of the panel with a solid fastener so the panels do not slide down the roof. You should be able to angle a screw and screwgun so that the screw gets driven in underneath the area that will be covered by the wall flashing. You should use a grommeted screw or seal over the screw with quality butyl sealant.
Guest User

12/3/2004