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We had an enclosed patio added onto our house over ten years ago, and there have been constant issues with it leaking where the flashing is at the joint of the roof of the house and the flat roof of the patio. We since got a metal roof, and then had the enclosed patio roof coated and were told our leaky problems were a thing of the past. Not true. A friend has temporarily fixed it by spraying a rubberized, I think, coating at the joint, but upon an inspection yesterday, I saw where it is cracking and not adhering. What can I do at this joint that will prevent leaks? I've (hopefully) uploaded photos to show what it looks like.



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5/6/2020
I would probably suggest shortening the metal roof panels by 6 - 8" and working in a flashing that leads from underneath the metal out on top of the flat roof. These are always tough areas and oftentimes problems are the result of just trying to "butt" the two systems rather than flash them.
Isaiah Industries, Inc.
5/7/2020
Thanks for the reply, Todd. I can see from the bottom picture what you're talking about - just a better (deeper) piece of flashing. I'm not a roofer, of course. Is there any way to try to pry the existing panels up to slide in a new flashing?
5/7/2020
Unfortunately, no easy way to do this. The panels would need to be pulled and shortened. Sadly, this is a pretty common problem I see.
Isaiah Industries, Inc.
5/7/2020