Roof Valley Ice Water Shield

Ice and water protectors sometimes called ice and snow shields in cold climates are made with polymer modified bitumen.

Roof valley ice water shield.

A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water. In areas where there has been a history of ice forming along the eaves causing a backup of water as designated in table r301 2 1 an ice barrier that consists of a least two layers of underlayment cemented together or of a self adhering polymer modified bitumen sheet shall be used in lieu of normal underlayment and extend from the lowest edges of all roof surfaces to a point at least 24 inches 610 mm inside the exterior wall line of the building. 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. Eave metal figure 6 typical application of waterguard rain ice self adhering underlayment roof valleys waterguard rain ice is recommended to line roof valleys and application methods 1 2 or 3 can be used.

Of the roof can be laced across roof valleys and up the adjacent roof a minimum of 6 or lapped 6 onto the membrane valley liner. Owens corning weatherlock and certainteed winterguard. If you have a roof that you know to be older than 1980 it won t have this great product under the shingles. Years ago when ice dams caused lots of leaks it was recommended to put on a 3 foot strip of ice and water shield rubber like membrane along the bottom edge of the roof to prevent water ice dams.

Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. After that time it quickly came to be used by most companies to create better roofing systems whatever the weather. If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

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. The ice and water shield is an amazing roofing product that was first introduced in the 1980s. Some of the brands of ice water shield we commonly use. Install an underlayment centered in the roof valley.