I live in North NJ and we had a rainstorm the other day and I heard water dripping onto a vent. I went into the attic and saw that I had a hole in my attic roof about the size of a pen (diameter) - see the third picture; it is where the red wire is coming out of the dormer beneath the J channel. I didn't see this hole because the previous owner had insulation over it, which was absorbing the water. The leak is quite significant. It is located where dormer wall meets the roof.
I did some research and I found out that I'm in need of step flashing. Actually, I'm in need of a new roof but I'm trying to wait until this coming spring for financial reasons.
I ripped off some of the roof shingles and I noticed that along the dormer wall, the previous owner had put many layers of shingles (instead of step flashing) most likely to divert water away from the dormer. Also, the J channel is preventing me from accessing the shingles along the wall so I am unable to easily insert flashing from beneath.
My questions: What can I do to plug this leak to get me through this winter? I bought Karnak 19 Ultra Semi and my plan is to put Karnak all along the dormer wall. Will this get me through winter? Anything else you would recommend?