I have a leak. I think it’s leaking where the low sloping porch roof meets the small incline to my back windows. The nails popped out and i got a leak. I fixed it temporarily with some wet patch. It is raining alot and gets no sun. It keeps leaking so I pried up some shingles. Now the shingles are just crumbling. I put wet patch over and under them to fix the leak, and it sealed them down. It’s not pretty, but it worked until a hard rain. Recently I went back up to check on it, but the nails are just tearing away shingles when I lift them to inspect.
Should I replace a few shingles with some old extra shingles I have? I do not want leak in house. If I lift up and replace old shingles are there any tricks to cut away old patched area and crumbling shingles without ripping the hot tar paper seal up against house? The incline is heading up to back windows and the ceiling in the first floor back bedroom. Also do I seal the end of the shingles with wet patch, if water pools in that spot?
I have no luck and could really use some thoughts. Thanks for any ideas.