How Do I Figure Ice And Water Shield On Roof

12 pitch roof with a 12 in.

How do i figure ice and water shield on roof.

Ice and water shield solves a problem for homeowners it creates a waterproof seal for nails passing through that keeps melting ice out of the building. I am going to replace my roof my question is do i try to remove the existing ice and water shield or just lay new ice and water shield over the old. The minimum is typically 2 feet 24 inches or 0 60 m above the vertical projection of the inside of the exterior wall. Ice shield is a pain.

After that time it quickly came to be used by most companies to create better roofing systems whatever the weather. On roofs with a pitch lower than 4 12 but greater than 2 12 this requirement changes and the roof must entirely be covered with ice water shield before asphalt shingles can be applied. This is great but ice shield also creates other problems for roof installers. By design ice shield adheres to the roof deck.

So what s the harm if the ice barrier isn t applied far enough up the roof slope. Overhang and a 2 6 exterior wall. Ice and water protector must reach above the highest expected level of ice dams which will vary by region and the slope of your roof. If an ice dam occurs on your roof and water backs up under the shingles it will seep down into your home through the nail holes holding the shingles.

It delivers all the advantages of grace ice and water shield roofing underlayment with thermal stability metal and tile. 59 3 8 inches up the roof slope from the drip edge. If you have a roof that you know to be older than 1980 it won t have this great product under the shingles. During winters when there is a lot of snow and ice dams form higher up the roof slope water can pond up behind the dams and reach higher than 36 in.

You can locate the ice and water shield line item in xactimate as rfg iws. 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. The ice and water shield is an amazing roofing product that was first introduced in the 1980s. After sketching the roof in xactimate you can easily calculate the measurements by using this basic formula val 3 p 2 this stands for valley 3 perimeter 2.