In areas where there has been a history of ice forming along
the eaves causing a backup of water, an ice barrier that consists of at least
two layers of underlayment cemented together or of a self-adhering polymer
modified bitumen sheet shall be used in lieu of normal underlayment and extend
from the lowest edges of all roof surfaces to a point at least 24 inches inside
the exterior wall line of the building. IBC 1507.2.8.2
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