Types of Standing Seam Metal Roofing Panel Systems

Aug 18, 2025

Types of Standing Seam Metal Roofing Panel Systems

There are 3 types of standing seam metal roofing panels and all of them are a concealed fastener system. This means that the fasteners on each metal panel are not visible or exposed to the weather. Concealed fastener panels are more weather-tight and expensive when compared to exposed fastener panels.

          1.Mechanically Seamed – The panel edges are connected together with a roof seamer.

  • How it works: Panel legs are engaged and then mechanically seamed (crimped) together with a seaming tool.

  • Types:

    • Single-lock (90° seam) → easier and faster to install.

    • Double-lock (180° seam) → stronger, more watertight, best for harsh climates.

  • Best for: Low-slope roofs, snow-prone or high-wind areas.

  • Advantages: Superior strength and weather resistance.

  • Limitation: More labor-intensive and costly.



         2.Snap-Lock Standing Seam

    • How it works: Panels have roll-formed male and female legs that snap together without mechanical seaming.

    • Fastening: Clips or fasteners are concealed beneath the panels.

    • Best for: Residential and light commercial roofing.

    • Advantages: Faster installation, clean look, watertight.

    • Limitation: Not ideal for very low-slope roofs or extreme climates.



      3. Nail Strip (Fastener Flange) Standing Seam

      • How it works: One leg of the panel has a built-in fastener flange that is nailed or screwed to the roof deck, then the next panel snaps over it.

      • Best for: Residential use and small projects.

      • Advantages: Easy, economical, no clips needed.

      • Limitation: Limited expansion/contraction movement; not suitable for large roofs.




        Summary:

        • Snap-Lock → Fast install, residential.

        • Mechanical Lock (Single/Double) → Strongest, best for low-slope & harsh climates.

        • Nail Strip → Budget-friendly, simple install.

          Key Considerations When Choosing a System:

          • Roof Slope: Low-slope roofs need double-lock or batten systems for better waterproofing.

          • Climate: High-wind or snow-prone areas may require mechanical-lock or structural systems.

          • Budget: Snap-lock is more affordable, while double-lock and batten systems are premium options.

          • Aesthetics: Some profiles offer a more modern or traditional look

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