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Ice and water shield
Ice and water shield is a sticky waterproof membrane used in vulnerable roof areas like eaves and valleys.
Why it matters
It helps protect against ice dams and wind-driven rain that can force water under shingles.
Where people get this wrong
It is not meant to cover the whole roof in most cases. Placement matters. It helps, but it does not fix bad ventilation that causes ice dams.
Real-world example
Snow melts on a warm roof, then refreezes at the cold eave. Water backs up under shingles. Ice and water shield is the seatbelt for that scenario.
Where this hits your build
This affects how your home handles water. Water damage is one of the most expensive problems to fix, and it often starts with details that seem small.
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