Ice And Water Shield Entire Roof
You should seriously consider using ice water shield if you live in ice dam country.
Ice and water shield entire roof. Potentially covering an entire roof with ice and water protector can prevent leaks even after high wind conditions blow shingles off the roof preventing further damage and making repair easier. It s typically only installed on the first leslie. It can protect your home from water leaks caused by ice dams and wind driven rain. Grace ice and water shield fully adhered smooth surface roofing underlayment provides best in class roof leak protection against wind driven rain and ice dams.
Both products have a separate purpose. Asphalt shingles are a little bit permeable in windy conditions but not very. 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. 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. However because the modified bitumen back surface is continuous these membranes can result in a vapor barrier. Other types of roofing including cedar shingles and concrete tile roofing are fairly permeable. The arguement that oh i would hate to be the next guy having to remove the ice and water shield couldn t you just remove the shingles leave the ice and water down and then put new ice and water on top of the old.