Quote:
Originally Posted by John Mercier
Synthetic underlay is meant to ''breathe'', while the Ice & Water Shield is meant to protect areas with a high risk to building ice dams or wind-driven rain. . . . With the low slope of a porch roof, I would surmise that wind-driven rain would be a serious consideration even above an unheated space with good air circulation.
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Two sides of the roof face south and east, where there won't be any wind-driven rain. One short side faces west, which I guess would be exposed to wind-driven rain. There has never been an ice dam on this roof. It's easily reached with a roof rake or shoveled clean from the roof.