Roofing Ice Dam Membrane

In turn this water can creep up under the shingles causing a roof leak.

Roofing ice dam membrane.

When installing a new roof or replacing the old one consider adding a water repellent membrane such as ice and water shield underneath the shingles. An ice and water membrane is a type of self sealing adhesive underlayment. Install the ice barrier membrane according to the manufacturer s instructions with the drip edge installed on top of the membrane. Ice can build up on a roof slope usually at the unheated area at the eaves forming an ice dam that prevents water from draining off the roof.

Ask this old house general contractor tom silva explains the best ways to keep your roof and gutters free from those dreaded ice dams. An ice dam is a thick rim of ice that originates along the edges of a roof when snow melts and then refreezes. Tim healey ice protection membrane and the code. The purpose of ice and water underlayment is to stop water from passing through the roof system into a home.

Installed underneath your shingles it effectively waterproofs your roof decking preventing leaks from heavy rains and ice dams. Assuring integrity of the roof s waterproofing prevents leaks and consequent damage. Ice dam leak protection membrane is required along the eaves of roofs in parts of the united states where ice dams have a history of forming. A roofing membrane required by building codes in the united states installed under the roofing material helps prevent leakage from ice damming but has no effect on the formation of ice dams.

Then install regular roofing underlayment tar paper over the top of the drip edge and over the ice barrier and continuing all the way up the roof. The distance from the lower edge of the roof to the intersecting point of the slope and the plumb line is the minimum required height of the membrane. Ice and water protectors sometimes called ice and snow shields in cold climates are made with polymer modified bitumen. Ice and water membrane is needed most to address ice damming issues during the winter.

Ice and water protector sometimes also referred to as ice and water shield is a waterproof roof underlayment membrane developed to protect vulnerable areas on a roof from ice and water damage.