top of page
  • inspector45

Icicles are not Beautiful

Ice Dams

ICE DAMS: There are fixes but only one cure.

An Ice Dam is a hump of ice that forms at the edge of a roof under certain wintertime conditions. An ice dam can damage both your roof and the inside of your home. It will put gutters and downspouts at risk too.

Ice Dams are a common sight during our Manitoba winters. There are several things you can do to avoid ice dams or to reduce the risk of damage after one has formed, but there’s really only one cure and that is a combination of better sealing, insulation, and venting in the attic and eaves.


Ice dams form whenever the roof over the attic is warm enough to begin melting the bottom of the layer of snow on the roof. The water travels down between the layer of snow and roof surface until it reaches the eave which stays cold because it extends beyond the side of the house. There, the water refreezes, gradually growing into a mound of ice.

The flatter the pitch of the roof, the easier it is for an ice dam to get a grip. Gutters can also trap snow and ice. If snow and ice build up high enough in the gutter, it can provide a foundation for an ice dam.


If the ice dam gets large enough it will drip into the insulation and possibly down into the ceilings and exterior walls beneath the eave, ruining sheetrock and paint. If it breaks free, it can pull shingles and gutters off with it, and it will damage anything it falls on. Ice weighs nearly 55 pounds per cubic foot. This can be a significant load. Consider this that just 2 inches by 4 inches of ice spread along the edge of a 35 foot roof would weigh 107 pounds. If the roof sheathing stays wet, it can form mildew and start to rot.


There are two avenues of attack: dealing with an existing ice dam and preventing one in the first place

1. Remove the ice dam by breaking it free in small chucks. Do NOT use an ax or other sharp tool! You’ll cut through the shingles. Instead, tap lightly with a blunt mallet. This is slow, dangerous work, so hire someone experienced at roofing. Even if you do it safely, the chunks of ice can take pieces of shingle with them.

2. Clear out gutters and downspouts. Again, this is ladder work and an easy way to damage either plastic or metal gutters and spouts.

3. Melt troughs through the ice dam with calcium chloride ice melter. Do NOT use rock salt! It will damage paint, metals, and plants beneath the eave and wherever the salty water drains.

A good trough-maker is a tube of cloth (a leg from an old pair of panty hose works well). Fill it with calcium chloride, tie off the top, and lay it vertically across the ice dam. It will slowly melt its way down through the dam, clearing a path for the underlying water to flow free.


You can scrape snow from the roof whenever it falls, using a snow rake from below or a broom or plastic shovel from above. BE CAREFUL: The first method can bury you in snow, while the second can send you slipping off the roof. Hire someone who knows how to use a safety line.

You can replace your shingle roof with standing seam or other metal roof. Or you can replace the bottom three feet or so of your shingle roof with a wide metal drip edge. Whatever you do, install a water-repellant membrane under any new roofing.

NOTE: If your roof is not very steep, an ice dam can still form on metal roofing and drip edges.


All of these methods treat the symptoms, not the underlying problem, which is the warm roof, caused by poor insulation and venting of the space under the roof. We have found that the only way to cure an ice dam – and prevent one in the first place – is to:

1. Seal all points where warm air leaks from the living space into the spaces immediately below the roof sheathing.

2. Insulate the living space well enough to prevent conduction and convection of heat through the ceiling.

3. Vent the space between the insulation and the roof sheathing, so any heat that does leak through is carried away.

The ice dam cure will also cure a significant loss of heat from your home. It’s a win-win situation: The money you save on fuel bills will pay for the work to protect yourself from ice dams, and your tighter home will feel more comfortable during these cold Manitoba Winters.

5 views0 comments

Recent Posts

See All
bottom of page