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What is ice and water-shield underlayment?

April 26, 2017Ice underlayment

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What is ice and water-shield underlayment?

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A. Ice and water-shield underlayment is a continuous membrane installed under your roofing shingles in areas subject to ice damming. It prohibits water that might get under your shingles from reaching your wood structure. The membrane is made to seal nail penetrations from your shingle installation. The best places for this membrane are along your gutter lines, in your valleys, along any walls, around your chimneys and skylights.