Asphalt shingles use either cellulose or __________ as a base.

Asphalt shingles utilize either cellulose or fiberglass as a base material. The significance of fiberglass as a base for asphalt shingles lies in its properties, which contribute to the durability and performance of the roofing material. Fiberglass-reinforced shingles are lightweight, resistant to tearing, and provide better fire resistance compared to those with a cellulose base. Additionally, fiberglass shingles typically have a longer lifespan and improved resistance to moisture, making them a popular choice in modern roofing applications.

While other materials like wood, plastic, and metal are utilized in various aspects of roofing systems, they do not serve as the primary base material for asphalt shingles. Fiberglass, therefore, stands out as the correct answer due to its specific advantages and compatibility with asphalt in shingle construction.