Illinois Roofing Practice Exam 2026 – The Comprehensive All-in-One Guide for Exam Success!

Felt in roofing applications refers to a flexible sheet made from interlocking fibers, typically composed of natural or synthetic materials. This product is commonly used as an underlayment for roofing systems, providing a secondary layer of protection against moisture and wind. It helps to safeguard the decking beneath the roofing material, preventing water infiltration and damage.

Felt serves an essential role in enhancing the durability of the entire roofing assembly. When installed correctly beneath shingles or other roofing materials, it contributes to the overall integrity and longevity of the roof by acting as a barrier against water and vapor. Additionally, it provides an added layer of insulation which can be beneficial in certain roofing systems.

The other options describe different materials or functions that do not align with the specific characteristics of felt. Insulation materials are typically designed to resist heat transfer, thick coatings are used to enhance durability and waterproofing, and soundproofing materials have a different focus on noise reduction rather than the protective qualities that felt provides. Thus, the correct understanding of felt's composition and purpose in roofing applications is crucial.