Ice and water protectors sometimes called ice and snow shields in cold climates are made with polymer modified bitumen.
Roof ice protection.
With the code recommended installation of the ice barrier over the drip edge water can back up at the eaves edge and get behind the vertical leg of the drip edge where it can end up flowing into the joint between the fascia and the roof sheathing.
Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing.
Ice belt metal panels many roofs are made of shingles which work well to remove water until it starts to travel upward.
An ice dam is a solid ridge of ice that forms along the edges of your roof.
Once this thick ice forms it prevents melting snow from running off the roof.
Ice water barriers designed to protect the roof where water tends to collect including valleys vents chimneys and skylights.
An ice dam can damage both your roof and the inside of your home.
Weatherlock flex flexible self sealing ice water barrier provides excellent roof deck protection against water infiltration resulting from the freeze thaw cycle wind driven rains and normal water flow around eaves rakes valleys vents chimneys and skylights.
The ice and water should be installed underneath and prior to the installation of roofing shingles weather metal or asphalt on your roof.
Snow starts to melt in certain areas of the roof which are warmer than others due to heat loss from the attic.
First and foremost your roof needs to have at least 2 feet of ice and water installed at the eaves and valleys of the roof.
To take a more pro active approach in preventing ice dams you can install ice belt metal panels which are installed along the eaves to block water.
An ice dam is a hump of ice that forms at the edge of a roof under certain wintertime conditions.
Compare models to find which snow guard is right for you.
It will put gutters and downspouts at risk too.
This provides added protection against ice dams.
But ice dams can form in the gutter as well as on the roof.