ice wires vs ice belts?

jeffw_00August 10, 2011

Hi - granted that either should be a last resort, I'm wondering what people think of these 2 options. From what i read, home-improvement-store ice wires are cr-p, and professional-grade/installed are pricer than the ice belts (which is a 3' strip of aluminum). My roofer likes the wires, I like the belts because the belts are passive. My roof, however is barely 1-4 pitch, so I'm not 100% sure the belts will work. (I have really BAD ice dams on my 24' overhangs - it's like the roof was -designed- for ice dams there).

thanks in advance!

/j

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mainegrower

Ice dams are always caused by warm air beneath the roof deck. The problem is not your overhang, it's above it. There snow melts, then runs down to the eaves and freezes, then backs up under the shingles.

Retrofitting attic insulation and putting an ice and water shield type product on the entire roof deck before shingling are possible solutions for the future. For now, I'd avoid any sort of electrical device and give the metal belts a try. They should help considerably if they receive some direct sun exposure. (There is a bit of danger from falling ice to consider). It's difficult work, but using a roof rake from the ground to remove snow can also make a difference.

    Bookmark   August 11, 2011 at 5:50AM
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jeffw_00

Yes,yes - roof has a low pitch. attic is insulated as best it can be (some areas can't be), ridge/soffit vents are in place, along with 12' of Ice/water barrier (which unfortunately, might have some places where they nailed -through- the boards (sigh)). Where the ice falls isn't a problem. I know I could rake, or do ice wires, but I prefer a passive solution (i'm too old to be raking 8-])

thanks!
/j

    Bookmark   August 11, 2011 at 9:43AM
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windowsonwashington

Insulation will not address the air loss unless you have a thick blanket of cellulose or spray foam.

The attic needs proper air sealing and I would be willing to bet your ice damning issues will drop to nil.

Spray foam sealing of all the top plates, bypasses, ductwork, and other air leakage locations will go a long way.

Even with a low slope roof, you can spray foam that outside top plate in most cases and get a good enough R-Value on it that the attic ventilation will take care of any radiant heat loss.

    Bookmark   August 22, 2011 at 6:05PM
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