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 Firestone Rubbergard 60-Mil EPDM Roofing Rubber is a strong and flexible underlayment material designed mainly for low slope roofing jobs. Made from 60-mil thick rubber, it offers excellent durability and water resistance, which helps protect your roof from leaks and weather damage. Its flexibility makes it easy to work around unusual roof shapes, making it a solid choice for homeowners who want to tackle installations themselves as well as for professional contractors.

This product also holds up well against UV rays and temperature changes, which means it won't easily crack or degrade under sun exposure or in extreme weather. One thing to keep in mind is that you should order slightly larger sheets than your exact roof measurements to ensure full coverage, as exact sizing might leave gaps. While the product is quite heavy at 60 pounds, this weight corresponds to its sturdy build and thickness.

This EPDM roofing rubber provides great value through its long lifespan and reliable protection, making it especially suited for those needing a tough, water-resistant underlayment for flat or gently sloping roofs.