Ice Barrier Roofing Code

Section r905 1 2 ice barriers 2018 irc outlines which roofing types require ice dam leak protection what materials can be used as an ice barrier and how far up the roof plane the barrier must be installed.

Ice barrier roofing code.

Ice water barrier codes the roofing codes that mandate how much water ice barrier should be used on roofing projects will be different from region to region. 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. 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 shall be installed for asphalt shingles metal roof shingles mineral surfaced roll roofing slate and slate type shingles wood shingles and wood shakes. The eaves flashing shall be installed from the end of the deck to a minimum of 24 inches up the slope.

Not all roofing materials require an ice barrier. 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. The roofing codes in minnesota for example require that two layers of an ice water shield be adhered to the roof before the felt or finished roofing product can be added.