10 Best Underlayment For Metal Roof 2026 in the United States

The Titanium PSU30 Peel & Stick Roof Underlayment comes as a pallet of 25 rolls, making it well-suited for larger roofing projects. It stands out with its watertight asphalt-to-asphalt lap system, ensuring excellent water resistance, which is crucial for protecting a metal roof from leaks. The underlayment performs well in a wide range of temperatures, from -40°F to 240°F, making it versatile for various climates.

Its up to 6 months UV exposure rating adds to its durability, as it can withstand prolonged exposure to the sun without degrading quickly. Installation is made safer and easier with the patented SURE-FOOT slip-resistant technology, an essential feature for roof work. Each roll is 72 feet long, 36 inches wide, and weighs 48 lbs, providing a substantial coverage of 2 square per roll.

The material's minimum thickness of 45 mils is robust, contributing to its durability and protective capabilities. A potential drawback is the product’s weight, which could be cumbersome during installation. For someone looking for effective underlayment that is easy to install and provides strong water and UV resistance for metal roofs, the Titanium PSU30 is a strong contender.

The VEVOR Roll Roofing underlayment is made from EPDM rubber, a material known for its strong waterproofing and resistance to aging, making it a solid choice for protecting metal roofs from leaks and weather damage. Its 45 mil thickness offers good durability and protection against harsh weather conditions. Thanks to its flexibility, it adapts well to different roof shapes, whether flat or curved, which is helpful for many metal roof designs. It’s also lightweight and easy to cut, allowing for straightforward DIY installation without needing special tools or skills.

This underlayment performs well in terms of water resistance and can handle varying temperatures without deforming, important for roofs exposed to sun and cold. It also resists UV damage, which helps it last longer outdoors. The size of 10 by 15 feet covers a decent area, making it suitable for small to medium roofing projects like RVs or certain roof sections.

While it offers good weather resistance, it might not be the thickest or most heavy-duty option for extremely rugged or industrial metal roofs. The product’s weight of nearly 40 pounds means handling large pieces could be a bit cumbersome for some. For homeowners or DIY enthusiasts looking for an affordable, flexible, and reliable underlayment to improve waterproofing on metal roofs or similar surfaces, this VEVOR EPDM roll roofing presents a practical option that balances ease of use with solid weather protection, but may not be ideal for very large or highly demanding roofing tasks.

The Grace Self Adhering Ice and Water Shield Roof Underlayment HT is designed to protect roofs, including metal ones, from water damage and harsh weather. It’s made from a rubberized asphalt material with a tough polyethylene film that sticks firmly to surfaces, helping it seal tightly around nails or fasteners. This self-adhesive feature means installation is relatively straightforward, without needing extra adhesives or fasteners. The underlayment is 40 mils thick, which offers solid protection and durability.

It can tolerate high temperatures, making it suitable for use under metal roofs that can get hot under the sun. Additionally, it resists UV exposure for up to 120 days, so it won’t degrade quickly if left uncovered during installation or delays. The slip-resistant surface also adds safety for installers working on inclined roofs. One thing to keep in mind is the roll weight—over 50 pounds per roll—so handling might be a bit heavy for some users.

While it offers good water resistance and sealing around fasteners, the product is primarily designed for ice and water protection rather than as a complete vapor barrier, which might be important depending on your climate. With a strong tensile strength membrane, it holds up well under stress, supporting long-term roof integrity. This product is a solid choice for homeowners or contractors looking for a reliable, high-temperature underlayment with enhanced adhesion and protection beneath metal roofing.