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Old 09-15-2009, 07:19 PM   #1
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Ice & Water Shield??


We are currently getting quotes for the roof to be stripped & re-shingled on our 30 year old side split.

Out of all the quotes we've gotten we've narrowed it down to one guy, but we're not sure about his theory on ice & water shield.

He says there is currently a shield of some sort in place under the existing shingles, and he can feel it. He says it's not necessary to put a new one down if there's one there which makes sense. However a different roofer said that it might be some outdated product and if it isn't ice & water shield that it should be replaced.

The guy we want to go with says that ice & water shield is overkill anyway and that if tar paper is used properly it serves the same function.
He has said if we want the ice & water shield he will install it for us, but he doesn't think it's required.

We would really love to know what some of you pros out there think! Any input would be greatly appreciated.

For the record, we're in Canada so we do get our fair share of nasty winter weather.

Thanks!

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Old 09-15-2009, 07:32 PM   #2
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Ice & Water Shield??


In the US I&W is required 2' beyond the inner wall as I recall
When they take off the old shingles you should get a better idea of what's under there
Tar paper worked for decades & still works
I&W works better, especially if there is an ice dam

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Old 09-15-2009, 07:59 PM   #3
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Ice & Water Shield??


Not to mention the fact that if there is an old ice barrier, when yu tear the old roofing off, there will be thousands of holes through the barrier, rendering it useless to stop ice infiltration. For an ice barrier to function properly with nails through it, there must be nails filling those voids. The bituthane membranes will seal to the ice barriers.
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Old 09-16-2009, 09:59 PM   #4
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Ice & Water Shield??


I'm certainly no roofing expert but, I would definitely get new I&W shield put on. For some reason, the roofer you want to go with doesn't want to do that. Don't know why, he'd still get paid for doing it. I had a new roof done two years ago and they took off the old shield and put new stuff up, In fact, they ran it a little higher than usual to be safe, which sat well with me.
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Old 09-16-2009, 10:10 PM   #5
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Ice & Water Shield??


I wouldn't even consider not doing it. If you're already paying for a reroof, this won't add that much expense in comparision.

However, I think this guy might now know what he's doing. If a roofer told me it wasn't necessary I wouldn't even consider using him/her.
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Old 09-17-2009, 07:54 AM   #6
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Ice & Water Shield??


I wonder which one has the best price??????


The guy is actually telling you the truth. I&W is quite over kill for most of it's applications, but why not put it on since you have the roof open? Sure, you can go without it, or use the old stuff, and probably be just fine. Why take the risk though being it can be done so easily.

In the end, if you trust your roofer, trust him. It seems that you are questioning too much already.

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