Ice And Water Shield Over Whole Roof

Other types of roofing including cedar shingles and concrete tile roofing are fairly permeable.

Ice and water shield over whole roof.

Ice and water protectors sometimes called ice and snow shields in cold climates are made with polymer modified bitumen. It s typically only installed on the first leslie. Tamko s instructions say you can go as low as 2 12 as long as you do 2 layers of underlayment or i w over the whole roof. It can protect your home from water leaks caused by ice dams and wind driven rain.

Ice water shield is a thick sticky back underlayment also known as felt paper that will adhere to your roof deck and prevent water from seeping into your home if it gets under your shingles. Neither one is going to pass water vapor. Now ice and water shield is designed to stop ice damming or water that backs up say from your gutters and getting into the roof surface. It may have changed over the years but still proper ventilation can stop ice dams you can have icedams over i w shield just as easily as you can any other underlayment a cold roof is a good example of icedam prevention.

Both products have a separate purpose. Covering the entire roof with ice water is no different for the wood breathing than covering the entire roof with metal roofing. Asphalt shingles are a little bit permeable in windy conditions but not very. Tar paper over ice water shield under comp.

I would completely i w then a synthetic over it. Ice and water shield is a great product that can be used in spots to protect the most vulnerable areas of your roof or as a whole roof underlayment to protect from ice dams water dams storms and leaking in any area of the country and any weather. Many types of roofing including epdm and standing seam steel roofing are virtually impermeable to water vapor. 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.