For roofs 4/12 and greater with 3-tab shingles in severe climates, the ice protection extension must be at least how many inches?

For roofs 4/12 and greater with 3-tab shingles in severe climates, the ice protection extension must be at least how many inches?

• A. 16
• B. 24
• C. 36
• D. 48

Answer: (B)

The concept here is protecting the eave where ice dams form by using an ice-and-water shield that runs far enough up the roof to catch meltwater. For roofs with a 4/12 pitch or steeper and using 3-tab shingles in severe climates, code requires that the ice protection extend at least 24 inches up the roof from the eave. This extra length helps prevent water from backing under the shingles and into the attic or walls when snow melts and refreezes, which is more likely in severe climates. So the minimum extension is 24 inches. The other options exceed or fall short of what the code specifies for this scenario, which is why 24 inches is the correct requirement.

The concept here is protecting the eave where ice dams form by using an ice-and-water shield that runs far enough up the roof to catch meltwater. For roofs with a 4/12 pitch or steeper and using 3-tab shingles in severe climates, code requires that the ice protection extend at least 24 inches up the roof from the eave. This extra length helps prevent water from backing under the shingles and into the attic or walls when snow melts and refreezes, which is more likely in severe climates.

So the minimum extension is 24 inches. The other options exceed or fall short of what the code specifies for this scenario, which is why 24 inches is the correct requirement.