What Does Ice Shield Do

Ice and water shield is a waterproof membrane used to protect your roof from ice and water damage. Its main purpose is to protect your roof decking if water gets underneath your roofing material (asphalt shingles, metal roof, etc.).

Is it OK to put ice and water shield on entire roof?

Potentially, covering an entire roof with ice and water protector can prevent leaks even after high wind conditions blow shingles off the roof—preventing further damage and making repair easier. However, because the modified bitumen back surface is continuous, these membranes can result in a vapor barrier.

Does ice and water shield prevent ice dams?

Does ice and water shield prevent ice dams? No. Ice & water shield will not prevent ice dams. You’d get it installed simply to minimize the chances of leaks if you do get an ice dam.