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-   -   Ice & water shield on saltbox colonial? (http://www.diychatroom.com/f9/ice-water-shield-saltbox-colonial-119111/)

BruceA 10-03-2011 10:27 AM

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.

sixeightten 10-03-2011 10:48 AM

It depends. It sure wouldn't hurt though. Especially important on lower sloped roofs. Ventilation is probably the cause of your ice dam though.

MJW 10-03-2011 11:35 AM

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.

Slyfox 10-03-2011 03:26 PM

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.

Windows on Wash 10-05-2011 12:01 PM

Quote:

Originally Posted by MJW (Post 741209)
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.

BruceA 10-29-2011 02:03 PM

insulation?
 
In addition to adding more venting would you recommend I insulate the living area side and leave the roofing side in place?

rossfingal 10-29-2011 03:02 PM

Post some pictures.
It could help.

rossfingal

BruceA 10-31-2011 08:37 PM

picture of eave
 
1 Attachment(s)
This is a picture of the eaves

Windows on Wash 10-31-2011 08:47 PM

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.

BruceA 10-31-2011 09:31 PM

re foam
 
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.

Windows on Wash 10-31-2011 10:35 PM

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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