Nails used to fasten asphalt shingles should be what type?

The correct answer is that nails used to fasten asphalt shingles should be corrosion resistant. This is important because asphalt shingles are often exposed to harsh weather conditions, including rain and snow, which can cause rust and degradation in regular steel nails over time. Utilizing corrosion-resistant nails helps to ensure the longevity and effectiveness of the roofing system by preventing issues such as leaks or detachment that can occur when nails corrode and lose their holding power.

Additionally, while galvanized nails might be considered for their ability to resist rust, the term "corrosion resistant" is broader and includes various types of coatings or materials that provide protection against corrosion. Therefore, nails specifically labeled as corrosion resistant are the best choice, ensuring they can withstand moisture and other environmental factors over the lifespan of the roofing material.