Illinois Roofing Practice Exam 2026 – 400 Free Practice Questions to Pass the Exam

Bentonite is a type of porous clay known for its ability to expand significantly when exposed to water. This characteristic makes it particularly useful in various applications, including roofing, where it can serve as a waterproof barrier. Its swelling nature allows it to fill gaps and provide a seal that can effectively prevent water infiltration, making it a favorable option for certain roofing systems. Additionally, Bentonite is often used in combination with other materials and as a component in roofing products, adding another layer of protection.

The other options refer to different aspects of roofing materials and techniques. For instance, a roofing membrane typically refers to a waterproof layer used in flat roofing systems, while a type of asphalt incorporated into roofing is essential for various traditional roofing shakes and shingles. Lastly, roofing installation techniques cover methods and practices used for installing roofing materials, which are distinct from the properties and uses of specific substances like Bentonite.