On a roof slope of 5/12 using 3-tab asphalt strip shingles in severe climates, the approved ice protection membrane must extend from the roof eave to a minimum of how many inches inside the exterior wall?

On a roof slope of 5/12 using 3-tab asphalt strip shingles in severe climates, the approved ice protection membrane must extend from the roof eave to a minimum of how many inches inside the exterior wall?

• A. 12 inches
• B. 24 inches
• C. 36 inches
• D. 48 inches

Answer: (B)

The correct choice indicates that the approved ice protection membrane must extend a minimum of 24 inches inside the exterior wall for a roof slope of 5/12 using 3-tab asphalt strip shingles in severe climates. This requirement is vital for preventing ice damming, which can lead to significant water penetration issues. The extension ensures that the membrane overlaps the areas prone to ice accumulation, thus providing a barrier against water that could otherwise leak into the structure. Regarding the choices, other options suggest extending the membrane either too little or excessively. An extension of 12 inches may not provide sufficient coverage in severe climates where ice formation is common and could expose the roof to risks. On the other hand, extending the membrane 36 or 48 inches might be more than what is required, leading to unnecessary material costs and complexity in installation without significant additional benefit for this specific condition. The 24-inch requirement strikes a balance, effectively addressing the need for protection while maintaining cost-effectiveness and practicality in the roofing process.

The correct choice indicates that the approved ice protection membrane must extend a minimum of 24 inches inside the exterior wall for a roof slope of 5/12 using 3-tab asphalt strip shingles in severe climates. This requirement is vital for preventing ice damming, which can lead to significant water penetration issues. The extension ensures that the membrane overlaps the areas prone to ice accumulation, thus providing a barrier against water that could otherwise leak into the structure.

Regarding the choices, other options suggest extending the membrane either too little or excessively. An extension of 12 inches may not provide sufficient coverage in severe climates where ice formation is common and could expose the roof to risks. On the other hand, extending the membrane 36 or 48 inches might be more than what is required, leading to unnecessary material costs and complexity in installation without significant additional benefit for this specific condition. The 24-inch requirement strikes a balance, effectively addressing the need for protection while maintaining cost-effectiveness and practicality in the roofing process.