It's sold in rollsI've seen it 4, 6, and 12 wideIt's like a 1/8 thick sticky black tar on aluminum foil.They sell it at roofing material stores and some lumber stores.Thanks.
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It is called ice shield which is applied along the lower edge of your roof before laying shinglesDepending on the severity of your winter climate it can be anywhere from 6 to 24 inches wideIt prevents water from ice dams on your roof from getting under the shingles and leaking into your home.
