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

• A. One layer of 90 pound hot mopped mineral surfaced membrane
• B. Self-adhering ice and water shield at eaves
• C. Granular mineral surfaced underlayment
• D. Shingle-over protection at eaves

Answer: (A)

The correct answer highlights a choice that is not typically associated with ice protection measures for asphalt shingle roofs.

One layer of 90-pound hot mopped mineral surfaced membrane is generally not utilized for ice protection on asphalt shingle roofs. Ice protection typically requires materials that specifically adhere to the roof deck and provide a barrier against water infiltration caused by ice dams, which accumulate primarily at the eaves.

In contrast, self-adhering ice and water shield is commonly used at the eaves because it creates a watertight seal directly on the deck, effectively preventing water from seeping under the shingles during freezing and thawing cycles. Granular mineral surfaced underlayment also provides additional protection but is not typically categorized strictly as ice protection, although it aids in overall roof durability. Lastly, shingle-over protection at the eaves is designed to enhance the roof's defense against ice dams and is an accepted practice in roofing design focused on preventing ice-related damage.

Overall, the selected choice does not align with the common practices for enhancing ice protection on asphalt shingle roofs, which prioritize water-tight solutions rather than a heavy hot mopped membrane layer.