Introduction
Metal roof fasteners and rivets play a crucial role in the performance and longevity of a standing seam metal roofing system. These small components serve as the primary anchor points, securing metal panels, clips, trim, and flashing to the roof deck. Choosing the right fastener is essential to ensure structural integrity, weather resistance, and durability.
In this guide, we will explore the different types of metal roofing fasteners, their applications, material options, pricing, and key considerations to help you make an informed decision.
What Are Metal Roof Fasteners?
Metal roof fasteners are hardware components used to secure metal roofing panels, trim, and flashing to a roof deck or structural framing. These fasteners can be screws, rivets, or other mechanical devices designed for both concealed and exposed applications.
Fasteners vary in size, shape, and material composition, depending on the project requirements. Selecting the appropriate type ensures optimal load distribution, wind uplift resistance, and weather protection.
Types of Metal Roof Fasteners
Fasteners for metal roofing can be broadly categorized into concealed and exposed fasteners. Each type has specific advantages and applications.
Concealed Fasteners
Concealed fasteners are hidden beneath the metal roofing panels and are commonly used in standing seam systems. These fasteners provide a sleek, uninterrupted appearance while offering superior protection against moisture infiltration.
Pancake Head Fasteners
- Used to attach metal clips to the roof deck
- The head sits flush against the clip, creating a seamless look
- Typically sized as #10-16 x 1½” or #12-14 x 1”
- Available in carbon steel (galvanized) and stainless steel (302, 304, 410)
- Suitable for securing clips to wood or metal roof decks
Hex Head Fasteners
- Used for attaching metal panels to metal purlins in open-framing applications
- Penetrates the panel and the clip, ensuring a secure attachment
- Typically sized as ¼”-20 x 1”
- Made from carbon steel or stainless steel, sometimes with a stainless steel head and carbon steel shank
- Ideal for metal-to-metal connections in structural framing
Exposed Fasteners
Exposed fasteners penetrate the face of the metal panels and remain visible. These are commonly used in corrugated metal roofing systems, where a more traditional aesthetic is desired.
Exposed Gasket Head Fasteners
- Screws with a washer/gasket between the head and the panel to prevent water intrusion
- Typically sized as #10-14 x 2”
- Made from carbon steel, stainless steel (410 & 304), or zinc-coated
- Used for metal-to-wood and some metal-to-metal roofing applications
Pop Rivets / Blind Rivets
- Used to secure flashing, Z-closures, and other metal-to-metal connections where screws may not be suitable
- Standard size is ⅛” diameter
- Made from stainless steel for superior corrosion resistance
- Commonly used for flashing connections, rake and ridge flashing installations
Choosing the Right Fastener Material
The material of your fasteners is just as important as the type. Below are the most common fastener materials and their best-use cases.
Carbon Steel (Galvanized)
- Cost-effective and strong
- Can corrode in high-moisture or coastal environments
Stainless Steel (302, 304, 410)
- Excellent corrosion resistance and durability
- Ideal for coastal applications but more expensive than carbon steel
Zinc-Coated Fasteners
- Provides added corrosion protection
- Suitable for moderate climates but not as durable as stainless steel in extreme conditions
Combo Fasteners (Stainless Steel Head with Carbon Steel Shank)
- Cost-effective with corrosion resistance at critical points
- May not be suitable for all applications
Cost of Metal Roof Fasteners
Fastener prices vary depending on the material, size, manufacturer, and whether they are painted to match the roof color. Below are typical price ranges.
Pancake Head Fasteners
- Carbon steel: $9.00 – $15.00 per bag of 250
- Stainless steel: $28.00 – $35.00 per bag of 250
Exposed Gasket Head Fasteners
- Carbon steel: $11.00 – $17.00 per bag of 250
- Stainless steel: $35.00 – $42.00 per bag of 250
Pop Rivets
- Stainless steel: $18.00 – $26.00 per bag of 250
Prices fluctuate based on market conditions, so it’s recommended to check with manufacturers before purchasing.
Fastener Performance Testing
To ensure quality and reliability, metal roofing fasteners undergo rigorous testing, including:
- Salt spray testing (ASTM B117) to simulate harsh environments and test corrosion resistance
- Pullout value testing to measure the force required to pull a fastener out of a roof deck
- Tensile strength testing to determine the maximum load a fastener can withstand before breaking
- Shear strength testing to evaluate the force required to rip the fastener head off
These tests ensure that the fasteners you choose will provide long-lasting performance under extreme conditions.
Essential Installation Tools
For proper installation, specialized tools are required, including:
- Screw gun with adjustable torque settings for concealed and exposed fasteners
- Hex, Phillips, or square drive bits based on the fastener head type
- Rivet gun for pop rivet installations
Proper installation ensures a weathertight seal and extends the lifespan of your metal roof.
Columbus Metal Roofing: Your Trusted Local Expert
With over 20 years of experience, Columbus Metal Roofing in Columbus, OH, provides high-quality metal roofing installations backed by industry certifications, including CertainTeed Shingle Master Contractor, an A+ BBB rating, and 5-star Google reviews. Our 4-hour emergency roof repair services ensure that your home remains safe, beautiful, and valuable.
FAQs
What is the best fastener for a standing seam metal roof?
Pancake head fasteners are the best choice as they provide a secure hold while remaining concealed.
How do I prevent fasteners from rusting?
Use stainless steel fasteners in coastal or high-moisture areas to prevent corrosion.
Are rivets stronger than screws?
Rivets provide superior shear strength but lack the same pullout resistance as screws.
Should I use painted fasteners for my metal roof?
Yes, painted fasteners help match the roof color and provide additional corrosion resistance.
How often should I inspect my roof fasteners?
Inspect fasteners annually and after severe weather to check for looseness or corrosion.
Conclusion
Metal roofing fasteners and rivets are critical to the performance of your roof. Choosing the right type, material, and installation method ensures durability, weather resistance, and long-term savings. By investing in high-quality fasteners and expert installation, you can maximize the lifespan of your metal roof.
Explore the most popular metal roof systems for homes in Columbus, OH—click here to learn more.