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The new felt should go under the old felt. The new flashing should go under the old felt and over the new felt and new roll roofing. Depends on the slope of the new roof. The lower the slope the further it should extend. Roofing nails to the existing structural sheathing. The big idea is that layers of the lower roof should sit below corresponding layers ...


0

It shouldn't make a huge difference but higher is better as you ideally don't want it to spend most of its time submerged. Using the provided clips is a better solution long run as this puts less stress on all the components of the system.



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