Roof Ice And Water Shield Code

A 4 12 roof slope means the roof rises 4 feet for every 12 feet of horizontal roof span.

Roof ice and water shield code.

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. This code implies that ice and water shield eaves flashing is required for installation on all heated steep slope structures exception is unheated structures in colder climates. The 2020 indiana residential code regulates ice water shield and drip edge as follows. Roof assemblies and rooftop structures 780 cmr 1501 0 general 1501 1 scope.

Code 675 iac 14 4 4. A roofing membrane that is field applied using one layer of. Many local building codes require ice and water shield and national building code states ice and water shield must start at the roofs eave edge and extend 2 ft inside heated wall space of a structure. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.

Sps 321 28 4 b b the ice dam protection shall extend at least 30 inches up the roof slope from the roof edge and at least 12 inches up the roof slope beyond the inner face of the exterior wall. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. Rise of the roof to the horizontal run and is expressed as a fraction. The 2020 indiana residential code adopts and amends the first printing of the 2018 international residential code.

On roofs with slope equal to or greater than eight units vertical in 12 units horizontal 67 percent slope the ice barrier shall also be applied not less than 36 inches 914 mm measured along the roof slope from the eave edge of the building. Roofing ice and water shield is a critically component to any new roofing system especially in cold weather climates. The massachusetts state building code 364 780 cmr seventh edition 8 22 08 effective 9 1 08. 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.

Eaves flashing is required to prevent ice formation at the eaves and gutter to back up beneath the roof covering. The eaves flashing shall be installed from the end of the deck to a minimum of 24 inches up the slope. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. The provisions of 780 cmr 15 00.

Sps 321 28 5 5 other roof coverings. Roof slopes between 2 12 and 4 12 can use shingles but require roof application techniques to take into account a greater potential for ice dam water backup.