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Old 05-06-2013, 05:03 PM   #1
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Ice and water shield


Hello
I am roofing a cover for my patio. Is ice and water shield necessary. There is no heat source underneath and it is well vented. I do live in central Illinois and the roof is attached to the house on one end.

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Old 05-06-2013, 05:09 PM   #2
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Ice and water shield


As long as it's properly roofed with proper slope you don't need it. Some will tell you it's necessary but it's only actually necessary if you do half-assed roofing.

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Old 05-06-2013, 05:35 PM   #3
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Ice and water shield


What's the "pitch" on the roof?
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Old 05-06-2013, 06:02 PM   #4
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Ice and water shield


You only need ice dams protection membrane when the conditions for ice damming is anticipated. That does not mean that it is a substitute for having the proper slope in your roof. 4/12 for architectural shingles, 3/12 for three tabs. There is no requirement for ice dams protection membrane when there is no heat source below that could cause it.
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Old 05-06-2013, 08:58 PM   #5
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Ice and water shield


The pitch is 4/12 gable style
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Old 05-10-2013, 06:35 AM   #6
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Ice and water shield


Can you tell me the exact size of your roof & if its well vented then you don't need?

Last edited by ryan28; 05-10-2013 at 11:41 PM. Reason: Link removed, only contractors are allowed links and they must be in your signature.
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Old 05-10-2013, 06:56 AM   #7
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Ice and water shield


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Originally Posted by OldNBroken View Post
As long as it's properly roofed with proper slope you don't need it. Some will tell you it's necessary but it's only actually necessary if you do half-assed roofing.
It does not have to do with the roofing job, it has to do with the environment. Perhaps you don't understand how ice dams form. It has nothing to do with the quality of the roofing job. Also, when reroofing a house, "proper slope" is not a variable.
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Old 05-10-2013, 07:01 AM   #8
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Ice and water shield


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Originally Posted by jeffnc View Post
It does not have to do with the roofing job, it has to do with the environment. Perhaps you don't understand how ice dams form. It has nothing to do with the quality of the roofing job. Also, when reroofing a house, "proper slope" is not a variable.

Actually you are incorrct. As you live in NC there is little possibility of ice dams being areal problem.

The higher the slope the less water remaining on the roof to freeze and cause Ice dams.
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Old 05-10-2013, 10:54 AM   #9
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Ice and water shield


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Originally Posted by jeffnc View Post
It does not have to do with the roofing job, it has to do with the environment. Perhaps you don't understand how ice dams form. It has nothing to do with the quality of the roofing job. Also, when reroofing a house, "proper slope" is not a variable.
Perhaps you don't understand how to read the OP. Patio, no heat, well-vented.
I live in North Idaho. We have a little bit of experience with snow and ice.
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Old 05-10-2013, 11:00 AM   #10
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Ice and water shield


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Can you tell me the exact size of your roof & if its well vented then you don't need it.

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Old 05-10-2013, 02:50 PM   #11
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Ice and water shield


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Actually you are incorrct. As you live in NC there is little possibility of ice dams being areal problem.
Where I live has absolutely nothing to do with it.
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Old 05-10-2013, 02:51 PM   #12
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Ice and water shield


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Perhaps you don't understand how to read the OP. Patio, no heat, well-vented.
I didn't reply to the OP, I replied to you. You said ice shield isn't needed unless the roofing is half-assed. Not true.
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Old 05-10-2013, 06:33 PM   #13
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Ice and water shield


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Originally Posted by Musaw17 View Post
Is ice and water shield necessary. There is no heat source underneath and it is well vented.
first I would recommend contacting your local building department to determine if it is required based upon your building code. Hard for us to know what is required everywhere.

with that said in my opinion on the surface it should not be required because you do not have conditions that would lead to formation of ice dams. again this is an opinion and one not from the people in charge (building official) which along with $2.50 will get you an iced coffee.

if you have a low sloped roof (under 4:12 pitch) I typically recommend ice and water shield over the sheathing just in case you get wind blown water issues. Most building codes allow installation of shingles down to a 2:12 pitch roof (your code may vary). Some shingle manufacturers however will not warranty their products under a 4:12 pitch.

Yes I know the underlayment should take care of any water but I like having that extra security, call me a wimp ..... plus it helps to seal the nail penetration when attaching your shingles. you know your wind and rain conditions better than us.

Good luck!
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Old 05-12-2013, 05:24 PM   #14
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Ice and water shield


Western North Carolina has cold I have never felt before, cold biting, fridge cold. They do get ice dams in NC. As long as everything stays frozen you will be fine.
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Old 05-12-2013, 06:14 PM   #15
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if you have a low sloped roof (under 4:12 pitch) I typically recommend ice and water shield over the sheathing just in case you get wind blown water issues.
It's not just a good recommendation - it's right there in the manufacturer's requirements. Low slopes require either a water shield underlayment, or a double layer of roofing felt.

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