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TOPIC: General Discussion

ice dam membrane

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One of my metal roofing bids includes using ice dam membrane on the entire roof deck. Is there any draw back to this? It sounds like a good idea to me.
richard sprecker

12/17/2009
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It will eliminate any breathability through your roof deck. Therefore, I encourage making sure you have good attic ventilation beneath it. Todd Miller
Todd Miller
Isaiah Industries, Inc.

12/19/2009
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I have attic ventilation but not sure if it's a 1 to 300 ratio. Since I live in an area that has no snow or ice dam issues, is the membrane that much better than a synthetic underlayment? Thanks
richard sprecker

12/19/2009
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