Roofing
Ice and Water Shield
A self-adhering waterproof membrane applied at roof eaves, valleys, and other vulnerable areas to prevent water infiltration from ice dams and wind-driven rain.
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In the Field
Ice and water shield is mandatory in cold climates at the eave (minimum 24 inches inside the warm wall) and in all valleys. It's self-sealing around nails. Install it on a clean, dry deck — it bonds permanently and is nearly impossible to remove cleanly.
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Rule of Thumb
Extend ice and water shield a minimum of 24 inches past the interior face of the exterior wall at the eave. In very cold climates or steep areas of snow accumulation, extend it 36–48 inches.