Felt paper is a type of material made from compressed fibers, often used in construction and crafts. It is typically made from wool, synthetic fibers, or a combination of both. Felt paper is known for its durability, insulation properties, and ability to absorb moisture, making it useful for various applications, including roofing and flooring. In construction, felt paper serves as a protective barrier against water and moisture, helping to prevent damage to structures. It is commonly used under shingles in roofing systems and as an underlayment for flooring materials. Its versatility also makes it popular in arts and crafts, where it can be cut, sewn, and shaped easily.