Metal Roof Flashing where Metal Meets Concrete Block

Guest User
I purchased an old building. The metal roof was installed by an amateur 4 years ago and it is leaking. I took a walk up on the roof and there are no obvious holes. The roof is installed on a concrete block building and has about a 6/12 pitch. He removed a few rows of blocks at one end of the building so that the roof drains into a gutter on one 28' end of the 28'x80' buidling. Apparently, the installer used some old flashing that is in between the layers of concrete block. The flashing was then pulled down at a 45 degree angle and attached to the metal roof with screws. I can see that the flashing was not screwed down in enough places as it is ripply. Because of the way the flashing is installed, I cannot yet see what the installer did where the metal butts up against the concrete blocks. I'm guessing that there is no flashing there, but rather just the old flashing I've described. Please comment on my plan: 1. Unsrew and lift some of the flashing to see if the installer put any kind of flashing where the metal roof actually butts up against the concrete blocks. My plan would be to then add new flashing. What's the best way to attach new flashing to the blocks and then to the existing metal roof? 2. I will then reinstall the old flashing. In most cases, this flashing drops from in between the blocks at a 45 degree angle before it contacts the metal roof. I would plan to install at least twice as many screws as currently exist. I will then coat the seam with a sealant, recognizing that in some instances, there will be as much as a 1/4" gap to seal. Again, what sort of sealant should I use, or would I be better off trying to solder the seams? Keep in mind that the roof is 80' long and 28' wide. 3. To be safe, I will put sealant over every screw in the roof (the rubber under the screws seems to be OK, btw). 4. Finally, at the edge of the roof where it drains, the installer left zero overhang. It appears that some of the water is wicking under the roof at this point. Would installation of a drip edge flashing be appropriate, or is there a better method to direct the water into the gutter?
Guest User
Bruce, Unscrew the flashing and post a picture of what is behind it. There are may of us that read this that can tell you what you need once we see what you've got. [email protected]
Todd Miller
Isaiah Industries, Inc.
Wade's advice is good, of course.
Find a Professional

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Professionals in your area for a free consultation and estimate.