How Do I Figure Ice And Water Shield On Roof

Hi my name is howard this is my first time using the forum.

How do i figure ice and water shield on roof. You can locate the ice and water shield line item in xactimate as rfg iws. 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. So what s the harm if the ice barrier isn t applied far enough up the roof slope. 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.

Grace ice and water shield ht fully adhered smooth grace ice and water shield ht fully adhered smooth surface roofing underlayment is specifically designed for high temperature applications such as metal and tile roofs. 59 3 8 inches up the roof slope from the drip edge. Overhang and a 2 6 exterior wall. The ice and water shield is an amazing roofing product that was first introduced in the 1980s.

If you have a roof that you know to be older than 1980 it won t have this great product under the shingles. It delivers all the advantages of grace ice and water shield roofing underlayment with thermal stability metal and tile. The below diagram helps outline exactly how to determine how much ice water shield is needed on any given roof above 4 12 pitch. 12 pitch roof with a 12 in.

Ice shield is a pain. 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. 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. This is great but ice shield also creates other problems for roof installers.

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. 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. By design ice shield adheres to the roof deck. 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.