The roof of my chalet slopes at 45 degrees. I am adding a mud room. My roof is 2×10’s at 24″ centers, sheathed with 5/8″ T &G plywood, shingled with 25 year asphalt shingles. My new rafters, at 22.5 degrees, will be at 16″ centers, attached 8 feet above the eaves. I am planning to strip the shingles and place a 16″ wide, 3/4″ plywood as a base to attach the new rafters to. Do I really need to remove the shingles, or can I just nail the 3/4″ plywood onto the shingles and affix the rafters to it?
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You will eventually need to flash the junction between the two roofs.