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Old 10-03-2011, 10:27 AM   #1
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Ice & water shield on saltbox colonial?


I am having roof redone and had ice dams last winter. I have a saltbox colonial; and the knee wall extends about 7' up. (on the angle) should I have the Ice & water shield go higher than 6' in the back of the house where I have the knee wall? Hard to find a consensus for this question.

Currently the roof side of the knee wall is insulated rather than the living area side. It has been suggested I insulate the living area side and leave the roofing side in place. This side of roof has a fairly steep pitch.

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Old 10-03-2011, 10:48 AM   #2
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Ice & water shield on saltbox colonial?


It depends. It sure wouldn't hurt though. Especially important on lower sloped roofs. Ventilation is probably the cause of your ice dam though.
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Old 10-03-2011, 11:35 AM   #3
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Ice & water shield on saltbox colonial?


Ventilation and lack of room for insulation on the knee wall is the problem. Have that addressed correctly and the house will perform better inside and out.

More I&W without doing more insulation and better ventilation will just make keep more moisture, condensation, and ice in the house and/or on the underside of the I&W. Then it will melt and rot the roof boards. Fix it right and be done with it the first time.
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Old 10-03-2011, 03:26 PM   #4
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Ice & water shield on saltbox colonial?


You should have the i&w go higher then 7', then like MJW posted, look into other issues going on and see what you can do to correct them.
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Old 10-05-2011, 12:01 PM   #5
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Ice & water shield on saltbox colonial?


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Originally Posted by MJW View Post
Ventilation and lack of room for insulation on the knee wall is the problem. Have that addressed correctly and the house will perform better inside and out.

More I&W without doing more insulation and better ventilation will just make keep more moisture, condensation, and ice in the house and/or on the underside of the I&W. Then it will melt and rot the roof boards. Fix it right and be done with it the first time.
+1

Well said.
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Old 10-29-2011, 02:03 PM   #6
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Ice & water shield on saltbox colonial?


In addition to adding more venting would you recommend I insulate the living area side and leave the roofing side in place?
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Old 10-29-2011, 03:02 PM   #7
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Ice & water shield on saltbox colonial?


Post some pictures.
It could help.

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Old 10-31-2011, 08:37 PM   #8
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Ice & water shield on saltbox colonial?


This is a picture of the eaves
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Old 10-31-2011, 08:47 PM   #9
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Ice & water shield on saltbox colonial?


In these scenarios, there is no way that they insulation layer that is represented by a roughly 3" batt of fiberglass is anywhere near adequate.

I would put air tight foam on the living side and up the insulation value. Get it air tight as well.
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Old 10-31-2011, 09:31 PM   #10
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Ice & water shield on saltbox colonial?


Thank you for your reply. I had never heard of doing foam insulation, I suspect is not that popular here in MA. It sounds somewhat complicated & expensive. I have seen fiberglass batts then a cover to seal that looks like foil covered bubble wrap.
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Old 10-31-2011, 10:35 PM   #11
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Ice & water shield on saltbox colonial?


Spray foam is going to be more expensive than its fiberglass counterparts.

You can use rigid foam and get the same R-Value benefits as compared to fiberglass.

Fiberglass as an insulator is pretty abysmal in most cases.
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