When installing 3 tab asphalt strip shingles in severe climates, on a roof slope of 5/12 the approved ice protection membrane should extend from the roof eave to a minimum of ____ inches inside the exterior wall (this applies to roofs 4/12 and greater)

When installing 3 tab asphalt strip shingles in severe climates, on a roof slope of 5/12 the approved ice protection membrane should extend from the roof eave to a minimum of ____ inches inside the exterior wall (this applies to roofs 4/12 and greater)

• A. 16
• B. 48
• C. 24
• D. 36

Answer: (C)

Ice dam prevention is the idea here: an ice protection membrane provides a waterproof barrier beneath the shingles at the eaves to stop water from backing up under the roof when snow melts. For roofs with a slope of four-in-twelve or greater in severe climates, this membrane must extend from the eave up the roof to a minimum distance inside the exterior wall line of two feet. That two-foot extension, equivalent to 24 inches, ensures protection in the critical area where heat loss can melt snow and create an ice dam, reducing the chance of leaks as water flows toward the eave. The exact distance is driven by climate severity rather than the slope, so a 5/12 roof still uses the same two-foot requirement. Shorter extensions leave a vulnerable zone near the eave, while longer extensions aren’t typically required by code or common practice in these conditions.

Ice dam prevention is the idea here: an ice protection membrane provides a waterproof barrier beneath the shingles at the eaves to stop water from backing up under the roof when snow melts. For roofs with a slope of four-in-twelve or greater in severe climates, this membrane must extend from the eave up the roof to a minimum distance inside the exterior wall line of two feet. That two-foot extension, equivalent to 24 inches, ensures protection in the critical area where heat loss can melt snow and create an ice dam, reducing the chance of leaks as water flows toward the eave. The exact distance is driven by climate severity rather than the slope, so a 5/12 roof still uses the same two-foot requirement. Shorter extensions leave a vulnerable zone near the eave, while longer extensions aren’t typically required by code or common practice in these conditions.