Ice Dams

Just what is an ice dam?

It is a ridge of ice sitting on the edge of a roof that prevents the drainage of snow melt. This backed up water can leak into the house and damage ceilings, walls, and insulation. Ice dams form when the lower surface of a roof is below 32°F and the upper surface is above that temperature. These temperature differences must remain in place for a prolonged time in order to have an ice dam form. As the snow melts, the dripping water freezes on the lower surface of the roof. The buildup of ice forms the dam; water trapped behind the dam seeks any crack or opening and will flow into the home.

Steps to take when you find an ice dam on your roof:

1. Get the remaining snow off of the roof.  Use a “roof rake” or push broom but be careful not to damage the surface of the roof.
2. Make some channels for the water to flow through using a hose.  Work from the lower edge of the dam upwards.  The channel will be a temporary solution, but will help in the case of an emergency. ( water pouring into your home)

Preventative measures:

1. Prevent the flow of warm, moist air into the attic space.
2. Seal air leaks between the house and attic.
3. Consider increasing insulation to cut down on heat loss from the heated space in your home.
4. Take a look at the natural attic ventilation.  This can help dry the attic and remove heat buildup in the summer.

Liz Meimann

I received both my undergraduate and graduate degrees in Food Science at Iowa State University. I love to quilt, sew, cook, and bake. I spent many years gardening, canning, and preserving food for my family when my children were at home.

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