Hello, everyone! Hope Thanksgiving went well! As a slow DIY roofer, I am still tackling the same roof plane. Finally finished both valley in a “dormer” style layout and transitioned the ridge cap onto main roof. I again followed Mike Guertin’s advice on using Grace IWS under the transition cap shingle, then cap shingle cut towards the middle so it can “hug” the dormer while going onto main roof. Then another Grace IWS to cover that cutout. And to make it 100%, nailed a piece of cap shingle to overlap all of that very well before main roof shingles go above it.
Mind you, it is cool and overcast here, so shingles will not adhere or settle probably for another week when we expect 70 degrees with sunshine again. Here is the detail:
Of course, as much Grace as I put there, should the cap shingle crack over time, the leak will be unlikely. Besides what I described above, both valleys are double lined with Grace so nothing should come to contact with deck. Of course, despite my best efforts (using hair dryer to warm cap shingle so it bends better, you can still see below some loss of rocks where the stress bend is). Should I let it be or maybe put a dab of Geocel 2300 on there just to make it last longer before it cracks?
I hope I did this right. Any feedback appreciated before I proceed further. Be kind on an amateur!
View from the top (before I finished capping the vent):