I decided to use closed cut valley since I am using thicker architectural shingles. Per recommendations, first row is woven with larger roof course over the first smaller roof course over valley, then will stagger across the valley from the smaller roof. Basically it is garage roof coming to connect to main roof. Main roof has the drip edge, it is taller so it will have the cut shingles.
My question is this, for the very first shingle from main roof that will be woven, where do I terminate the butt edge of that shingle? In other words, how low do I go with that first shingle that will run perpendicular to the drip edge? Do I continue it until it touches the shingle on garage roof, do I terminate it before that point, or do I overlap it enough that butt edge BENDS onto garage roof plane? Bend would be more water resistant, but may be more likely to crack. I know, excessive detail, but want to make sure it is done right. I was able to fit about 2 inches of shingle up under the main roof facia board and shoved as many as I could under the main roof soffit. And then I used grace to connect Valley to the garage shingle so water can be expelled onto shingle should the valley shingles leak. I think I followed all the rules to a T, but confused on how to start first woven course before switching to closed valley system. Thanks in advance!