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Old 10-01-2011, 05:42 PM   #16
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No felt under 25 year old three tabs!


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Originally Posted by ParagonEx View Post
Ice & Water shield does not prevent ice damming.
Correct, but it does keep water away from the sheathing if you have it. I know it's not a solution, but it's better than felt.


Last edited by Gary in WA; 10-02-2011 at 05:02 PM. Reason: Removed link from quote.
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Old 10-01-2011, 11:30 PM   #17
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No felt under 25 year old three tabs!


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My house was built in 1950, 2nd layer of shingles applied in 1992. The original owners sold it to me, said the 1992 roof was the first they did. I found moderately significant water damage inside the walls where a dormer meets, I'm guessing must have been happening just prior to the re-roofing. Still, 42 years from the original roof... now on nearly 20 years for the replacement roof.

I have the unhappy duty of being the one to pay to have everything stripped and re-done. Whether it's a crutch or not I know I'll be asking the roofer to quote me at least 6-8' of I&W to gain an edge over ice dams that happy frequently here.
Ice damn are a heat loss (radiant and air) issue and usually compounded by improper ventilation.

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Old 10-02-2011, 05:46 AM   #18
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No felt under 25 year old three tabs!


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Originally Posted by bubbler View Post
Correct, but it does keep water away from the sheathing if you have it. I know it's not a solution, but it's better than felt.

I re-roofed my home last November, the back side faces North East and the front faces South West.
On the back I ran two courses high of ice guard across the eaves and on the front I ran just one course high and ran a full course up the valleys.
The one wall on my home (house meets garage) faces North so I placed a half sheet of ice guard on the deck against the wall and then after shingles & flashing I placed a half sheet up the wall over the top of the flashing.
I also used ice guard around all three other penetrations which were one plumbing stack and two chimneys.
I used 15# felt on the rest of the sheathing, if it had been for a customer I would have done the same except I would have used a minimum of 30# felt instead of 15#.
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Old 10-03-2011, 08:42 AM   #19
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No felt under 25 year old three tabs!


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Originally Posted by ParagonEx View Post
As a vapor barrier between the condensation in your attic and your shingles.

www.paragonexteriors.com
That would mean that the moisture is then condensing on the underside of the felt and in the sheathing. If that were the case, one would be better off to have the moisture reach the bottom of the shingle, where it might stand a better chance to vent.

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