Top 9 Best Underlayment For Metal Roof Over Shingles

When installing a metal roof over shingles, preventing water intrusion and ensuring long-term protection is essential. This synthetic underlayment provides a robust waterproof barrier, making it a reliable choice for both new installations and repairs.

SIPA’s 100 GSM underlayment stands out for its broad compatibility and resilience, suitable for both commercial and residential rooftops. It’s ideal for homeowners and contractors who need flexibility in scheduling, thanks to its strong UV resistance and wide application range.

• Waterproof synthetic membrane: Shields roof decking from moisture before and during metal roof installation.
• UV resistance up to 60 days: Allows for flexible installation timelines without compromising protection.
• Meets ASTM standards: Ensures compliance with industry benchmarks for safety and durability.

Compared to traditional felt, SIPA’s synthetic design prioritizes weather resistance and ease of handling. While it offers excellent coverage and adaptability, it does require proper fastening tools for secure installation.

Roofing projects often face delays, making prolonged weather protection a real concern. This underlayment offers up to six months of exposure, giving installers peace of mind during unpredictable schedules.

Tyvek Protec 200 is designed for those who value both durability and code compliance. Its Class A fire rating and long warranty make it a dependable choice for residential and light commercial projects where extended exposure may occur.

• Six months weather protection: Maintains integrity even with project delays.
• Class A fire rating: Meets high safety standards for roofing materials.
• 50-year limited warranty: Provides long-term assurance for buyers.

Unlike basic synthetics, Tyvek Protec 200 prioritizes exposure resistance and safety certifications. The tradeoff is a slightly heavier roll, which may require more effort during handling.

Slippery surfaces can be a hazard when working on metal roofs, especially over existing shingles. This underlayment addresses that issue with a slip-resistant bottom and textured fabric, making it safer for installers on steep slopes.

ArmorLay 25 is a practical pick for both professionals and DIYers who need extra traction during installation. It’s also water-resistant and resists warping, providing reliable performance in various weather conditions.

• Slip-resistant polymer backing: Enhances safety on steep or wet surfaces.
• 60-day UV exposure: Offers flexibility for project timelines.
• ASTM D4869 and D226 compliant: Meets recognized performance standards.

Compared to felt or smoother synthetics, ArmorLay 25 prioritizes installer safety and walkability. The main compromise is that it may not offer the same fire rating as some premium options.

For those seeking straightforward, broad coverage under metal roofing, this underlayment provides a no-frills solution. It’s designed to cover large areas efficiently, making it suitable for bigger residential or commercial projects.

INTERWRAP’s UDL25 is best for users who prioritize ease of installation and need to cover significant roof space quickly. It’s a practical choice for contractors and property owners looking for reliable, uncomplicated protection.

• Large 48-inch width: Reduces seams and speeds up installation.
• 250-foot roll length: Covers up to 1,000 square feet per roll.
• Simple synthetic construction: Focuses on basic waterproofing and coverage.

Compared to feature-rich alternatives, this product prioritizes simplicity and area coverage. However, it lacks detailed exposure or fire resistance information, so it may not suit projects with specific code requirements.

Not all roofing jobs require heavy-duty underlayment. For lighter projects or where ease of handling is key, this synthetic option delivers reliable protection without added bulk.

Tyvek Protec 160 is ideal for homeowners and contractors looking for a balance between performance and manageability. Its lighter weight makes it easier to transport and install, especially on smaller roofs.

• Lightweight synthetic design: Eases handling and reduces fatigue during installation.
• Standard 4' x 250' roll: Provides ample coverage for most residential roofs.
• Tyvek brand reliability: Trusted for consistent quality in roofing materials.

Compared to thicker or more feature-rich underlayments, this product prioritizes simplicity and ease of use. The tradeoff is fewer advanced features or certifications.

Professional-grade projects demand materials that can withstand demanding conditions. This underlayment is engineered for durability, making it a solid choice for contractors and those seeking long-lasting performance.

INTERWRAP Pro-Grade UDL30 is best for users who want a more robust underlayment for metal roofs over shingles, especially in areas with challenging weather. It’s designed to deliver consistent protection over time.

• Pro-grade synthetic material: Built for enhanced durability and longevity.
• Wide 48-inch roll: Reduces seams for a cleaner installation.
• Suitable for demanding projects: Intended for professional use and tough environments.

Compared to lighter-duty options, this product prioritizes strength and durability. However, it may be more than what’s needed for smaller or simpler jobs.

Targeted repairs and quick fixes are sometimes all that’s needed, especially for leaks or vulnerable seams. This peel-and-stick membrane is designed for easy application, making it a go-to for DIYers and emergency repairs.

Gueevin’s butyl rubber membrane is flexible and solvent-free, adapting to thermal expansion and contraction. It’s best for homeowners or maintenance teams needing a simple, effective solution for sealing leaks on metal roofs and other surfaces.

• Peel-and-stick installation: No special tools required for quick application.
• Flexible butyl rubber: Adapts to movement and surface changes for lasting adhesion.
• Covers up to 96 sq ft per roll: Suitable for patching seams, flashing, and leak-prone areas.

Compared to full-roll underlayments, this product prioritizes ease of use and targeted repairs. The tradeoff is limited coverage, making it less suitable for full-roof applications.

Persistent leaks and cracks can undermine a metal roof’s effectiveness, especially over aging shingles. This repair tape provides a long-lasting, weather-resistant seal for problem areas.

JevLoN’s self-adhesive tape is made from polymer-modified asphalt and thickened aluminum foil, offering strong adhesion and heat insulation. It’s ideal for those needing a versatile, cut-to-size solution for sealing leaks, flashing, or joints.

• Self-adhesive asphalt and foil: Fills cracks and gaps for a durable, watertight seal.
• Weather and fire resistant: Suitable for varied climates and conditions.
• Easy to cut and install: Customizable for different repair needs.

Compared to liquid sealants or standard tapes, this product prioritizes longevity and versatility. The main limitation is that it’s best suited for repairs rather than full underlayment coverage.

Areas prone to ice dams or wind-driven rain require extra protection at vulnerable points. This peel-and-stick underlayment is engineered to seal around nails and protect eaves, valleys, or entire roofs from water intrusion.

ZIP System’s rubberized asphalt membrane is best for users needing a high-performance barrier in critical roof zones. Its slip-resistant surface aids installation, and it meets code requirements for ice barriers.

• Self-adhered rubberized asphalt: Seals tightly around fasteners to prevent leaks.
• Slip-resistant surface: Improves safety and ease of application.
• High temperature tolerance: Withstands up to 260°F for demanding environments.

Compared to standard underlayments, this product prioritizes targeted leak protection and code compliance. The tradeoff is that it’s typically used in specific areas rather than as a full-roof solution.