ice dam membrane: "One of my metal roofing bids includes using ice dam ..." - richard sprecker (12/17/2009) | General Discussion | Archive

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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	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/14204/find/
It will eliminate any breathability through your roof deck. Therefore, I encourage making sure you have good attic ventilation beneath it.	Todd Miller Isaiah Industries, Inc. 12/19/2009	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/14205/find/
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	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/14206/find/