Illinois Roofing Practice Exam 2026 - Free Roofing License Practice Questions and Study Guide

The choice involving a two-ply membrane underlayment with an interply asphalt roof cement adhesive is correct because this approach provides enhanced protection against water intrusion, which is essential in areas that experience freezing and thawing cycles.

Water and ice dam protection is crucial for preventing water from backing up under roofing materials, which can lead to leaks and structural damage. A two-ply membrane underlayment consists of two layers of waterproof material that work together to create a robust barrier against moisture. The use of asphalt roof cement as an adhesive between the layers ensures that they form a solid, watertight seal, further improving the system's effectiveness.

In contrast, a single layer of roofing felt may not provide enough protection, especially in harsh climates, as it can be more susceptible to tearing and weather-related damage. Regular asphalt shingles with no underlayment lack adequate moisture protection, allowing the potential for water damage. A foam insulation layer under the tiles would not serve the primary purpose of a water and ice barrier and may not effectively prevent water intrusion in the same way that a properly installed membrane can.