There are several types of roofing underlayments, including:
1. Asphalt-saturated felt: This is a traditional roofing underlayment made of organic or fiberglass felt that is saturated with asphalt. It is commonly used in steep-slope roofing systems.
2. Synthetic underlayment: This type of underlayment is made of synthetic materials such as polypropylene, polyester, or a combination of both. It is lightweight, easy to handle, and offers greater durability and resistance to moisture than asphalt-saturated felt.
3. Rubberized asphalt: This type of underlayment is a self-adhering membrane made of rubberized asphalt. It is often used in low-slope roofing systems and is highly resistant to water, moisture, and UV degradation.
4. Thermoplastic Olefin (TPO) underlayment: This type of underlayment is a single-ply roofing system made of a durable TPO membrane. It is used in low-slope roofing systems and offers excellent weather resistance and UV protection.
5. Modified bitumen: This type of underlayment is a multi-layered roofing system made of modified asphalt and reinforced with various materials such as fiberglass or polyester. It is commonly used in low-slope roofing systems and offers good resistance to water and moisture.
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