All good advice here. 99% of the time ice and water shield installed at least 3 feet higher than the unheated portion of the roof will prevent any water from entering if dams occur. When I reroofed 7 years ago I did to 2 courses of I&WS and also in the valleys. This fixed my ice dam leaking problem without addressing the insulation. The quick fix during the winter I had the problem was to install heat cable, even if it's not put up perfect. As soon as the cable melted down to the roof the flood gates opened and the water stopped backing in.
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SIKSUKR
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