10 Best Roofing Underlayment Materials 2026 in the United States

The Firestone RubberGard 45 mil EPDM roofing rubber is a flexible, durable underlayment material designed especially for low slope roofs and re-roofing projects. Made from 45-mil thick EPDM rubber, it offers strong water resistance to protect your roof from leaks and weather damage. Its flexibility means it can easily fit unusual roof shapes, making it a good choice for both DIY homeowners and professional roofing contractors. The material also has good UV resistance, which helps it last longer when exposed to sunlight.

The product weighs about 135 pounds and covers 450 square feet, so handling and installation might require some effort or assistance. It’s recommended to buy a slightly larger size than your exact roof measurements to ensure full coverage. If you’re looking for a cost-effective, long-lasting roofing underlayment that adapts well to different roof shapes, this Firestone RubberGard EPDM is a reliable option.

The Firestone Rubbergard 45-Mil EPDM Roofing Rubber is a popular choice for low-slope roofing and re-roofing projects. Its 45-mil thickness provides a durable and tough barrier that resists water well, making it reliable for protecting your roof against leaks. The EPDM rubber material is known for its flexibility, which helps it fit around unusual roof shapes easily—this is great if you want a material that can adapt without cracking or breaking. It also has good UV resistance, so it can stand up to sunlight exposure without deteriorating quickly.

The product is noted for being easy to install, suitable for both DIY homeowners and professional roofing contractors. The liner size should be ordered a bit larger than your roof dimensions to ensure full coverage, so careful measuring is needed. Weighing 113 pounds for a 15 by 25-foot sheet, it's relatively heavy, which may require some assistance during installation.

This roofing underlayment fits well for anyone looking for a long-lasting, versatile rubber membrane for waterproofing and durability on varied roof shapes, especially in mild to moderate climates.

The ZIP System Peel and Stick Underlayment is a high-performance roofing underlayment designed to protect areas vulnerable to leaks or water damage, such as eaves, valleys, or entire roofs.

Made from self-adhered rubberized asphalt, it effectively seals around nails, providing robust water resistance and an additional layer of protection against ice dams and wind-driven rain. Its slip-resistant surface makes it easier and safer to apply, which is a significant advantage for DIY enthusiasts and professional roofers alike. Additionally, it meets the code requirements for an ice barrier or roofing underlayment as per ESR-4904 standards.

One of its standout features is its high temperature tolerance, with a maximum service temperature of 260 degrees Fahrenheit, making it suitable for roofs in hot climates. However, the underlayment's thickness is not specified, which might be a consideration for those looking for a more substantial barrier. It's also relatively heavy at 51 pounds, which could make handling and installation more challenging. While it offers excellent water resistance, the product brief does not mention UV resistance, a factor that could affect its longevity if exposed to sunlight for extended periods.