Roof Valley Ice Water Shield

Owens corning weatherlock and certainteed winterguard.

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

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. 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. 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. Install an underlayment centered in the roof valley.

If you have a roof that you know to be older than 1980 it won t have this great product under the shingles. 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. 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 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.

Grace ice and water shield roofing underlayment a registered trademark of gcp applied technologies is the name that contractors trust the most to protect their reputations. Some of the brands of ice water shield we commonly use. We use this flexible self adhering barrier around critical penetration points on your roof such as chimneys roof to wall areas plumbing pipes valleys and lower pitched areas on the roof deck. The ice and water shield is an amazing roofing product that was first introduced in the 1980s.