I added a room to the side of my house, and the new roof goes onto the existing roof. I am almost done roofing it. The image below depicts the current status. I put roofing felt down under the two rows of the existing shingles as shown in the image. I have a roll of aluminum flashing that I plan on putting over the felt at the roof intersection where there is about a 1/2" drop from the new roof OSB to the existing roof. After that I have just one more row of rolled roofing to install. Here are my questions.
- Does the new felt go far enough under the shingles?
- Should the flashing cover the end of the new felt as well as the intersection?
- How far under the shingles does the rolled roofing need to extend?
- How do I attach the flashing and rolled roofing under the shingles?
I'm thinking that I would lift up the second or third row of shingles and nail under them with the rolled roofing in place.