Which of the following is not typical of ice protection for asphalt shingle roofs?

The choice concerning one layer of a 90-pound hot-mopped mineral surface membrane does not align with typical ice protection practices for asphalt shingle roofs. Generally, ice protection strategies for asphalt shingles focus on preventing ice damming, which can cause water to back up under shingles and lead to leaks.

Common methods include the use of two layers of ice and water shield, which provides overlapping layers of protection against melting ice. Additionally, extending ice protection a significant height up the roof—such as the recommended 36 inches—ensures more comprehensive coverage in areas prone to ice buildup. Self-adhesive membranes are also frequently utilized because of their ease of installation and effective sealing properties, which are essential for preventing leaks.

A single layer of a 90-pound hot-mopped mineral surface membrane is not a standard method for ice protection in this context and therefore does not meet the specific needs for safeguarding asphalt shingle roofs against ice damming issues effectively.