Winter in Ottawa Ontario can be different every year. Because there is always freezing rain in the forecast for the capital, there will be layers of snow and ice build up on your roof. It can cause structural damage because of the weight.

There are many reasons for ice damming other than freezing rain like poor ventilation, heat loss, blocked soffit or even having a low-pitched roof. It the slope of the roof is 6/12 or less, ice and water shield must be installed under neat and both sides of  the valleys. On a 4/12 pitched roof i would recommend 9 feet of ice and water shield. If your house is facing north and south than your north side is more at risk of water damage before the south side. If you ask why; south-facing side of the house always kept warm by the sun and snow will always…