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In areas where there has been a history of ice forming along the eaves causing a backup of water, an ice barrier shall be installed for asphalt shingles, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shingles, and wood shakes. The ice barrier shall consist of not less than two layers of underlayment cemented together, or a self-adhering polymer modified bitumen sheet shall be used in place of normal underlayment and extend from the lowest edges of all roof surfaces to a point not less than 24 inches (610 mm) inside the exterior wall line of the building.
Exception: Detached accessory structures that do not contain conditioned floor area.

Related Code Sections

1507.1.2 Roof Assemblies and Rooftop Structures, Ice Barriers
In areas where there has been a history of ice forming along the eaves causing a backup of water, an ice barrier shall be installed for asphalt ...
1507.1.2 Roof Assemblies and Rooftop Structures, Ice Barriers
In areas where there has been a history of ice forming along the eaves causing a backup of water, an ice barrier shall be installed for asphalt ...