Ice And Water Shield Necessary? - Roofing/Siding - DIY Home Improvement | DIYChatroom

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Old 11-29-2012, 02:26 PM   #1
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Ice and water shield necessary?

Looking at a new roof. One quote at $4500, three others between $5500-6000. The lower end guy says I really don't need ice and water shield and a ridge vent (already have attic vents installed) - says if it's done right should not be a problem. He did make a valid point that my house has had its same roof for 25 years and has no evidence of leaks (which I agree been up in my attic and kept a close eye) and it has no ice and water shield.

I am in a southern/mid atlantic coastal area a few miles from the coast. We hardly get any snow/ice but do get the occasional noreaster and cat 1 hurricane that will blow wind and rain.

Any opinion? $1500 is a lot of money - it will still be architectural shingles, algae resistant, wind rated up to 130mph.


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Old 11-29-2012, 04:49 PM   #2
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Need to go back and add what your location is in your profile not just mention the general location in your post.
I'm in VA and my local building inspector will not let me do a roof without Storm and Ice.
I'm a big fan of ridge vents, it vents the whole roof not just a circle where the the vent happens to be. And they look a heck of a lot better.
There should not be that big an up charge for Storm and Ice.


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Old 11-29-2012, 06:56 PM   #3
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Yep, it's code in Va.
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Old 11-29-2012, 07:55 PM   #4
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Yeah, I'm in VA. Looks like if it's code then that is what I'll do. Although I would like to save money I will not cut corners on something that is code now. Thanks
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Old 12-03-2012, 08:17 AM   #5
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24" inside the warm wall. It won't really save you from an ice dam if the conditions are right and your home isn't air sealed/insulated or ventilated properly but it is code.
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Old 12-03-2012, 02:28 PM   #6
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Ok, it is human nature to always want to save your hard earned money, but it almost always comes back to bite you in the butt when you "go cheap" on something you know you need. Is ice shield necessary? it could be by code, so look into that and contact your local building department. I think it is absolutely essential. It "forgives" alot of mistakes and adds another layer of redundancy to your roof in the problem areas.

In my area, Chicago, Ice shield is requried at the gutter lines / eaves. It should start at the gutter / edge of the roof and extend not less than 24" past the interior warm wall. It is my understanding this is pretty much universal across most of the country. I also like to isntall ice shield in the valleys as well as any pre flashing areas. These pre flashing areas include where the rofo meets the wall, around chimneys, skylights, pipes, any area that will later receive metal first gets pre flashed with ice shield. It's the $100 difference between a roof that leaks in 5 years or in 25 years in my honest opinion. I have been doing this pre flashing now for about 10 years and haven't had one leak in the areas I've properly pre flashed.

Reuse vents? IMMEDIATELY DISQUALIFY THAT PROPOSAL. HE DOES NOT KNOW WHAT HE IS DOING!!!! Is that clear? So let's assume for a moment that your ventilation is under sized. It usually is undersized in my opinion because depending on when your house was built the codes were likely different and honestly people just didn't ventilate like the should have when energy was cheap... So reusing the existing ventilation might be a no no. Plus do you want a new roof with old vents?! Does that make any sense to you? Again a couple hundred more bucks to do it right.

Will he also reuse your old flashings? Hog wash I say!

Is ridge vent right for your roof? Maybe, maybe not. It depends on the architecture of your roof. For example on hip roofs ridge vent is usually too small. There are specific formulas we professional roofers use when calculating how much ventilation is needed. Once the calculation is performed we can determine which type of ventilation will achieve the best results.

You've got two quotes reasonably close to one another, and you've got one just way cheaper. Ask yourself why that is. Something smells fishy and I think you already knew that or wouldn't be asking us. What other corners is he cutting?

Read these two lins for a massive eduation on roofing and working with a professional roofer:

Good luck.


The information found in this post is not to be considered legal advice. The author of this post takes no responsibility for any losses that occur. Use at your own risk.
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