When installing 3 tab asphalt strip shingles in severe climates, the ice protection membrane should extend a minimum of how many inches inside the exterior wall on a roof slope of 5/12?

The correct choice indicates that the ice protection membrane should extend a minimum of 24 inches inside the exterior wall when installing 3-tab asphalt strip shingles in areas prone to severe climate conditions, particularly regarding ice damming.

This requirement is essential for preventing water intrusion that can occur due to ice buildup at the eaves of the roof, especially in colder climates where melting and refreezing can happen frequently. The recommendation for extending the membrane 24 inches provides an adequate buffer against potential water damage, as it covers the area most vulnerable to ice dams, effectively protecting the roof structure and interior spaces from water leaks.

In addition, while a slope of 5/12 is considered a moderate slope, it still requires proper waterproofing measures since water can still accumulate near the eaves. Therefore, adhering to this guideline for ice protection membrane placement ensures that the roof assembly is well protected from the adverse effects of severe weather.

Other choices may not provide enough coverage as recommended by roofing best practices and building codes designed to mitigate ice dam issues, which is why they are less favorable.