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+86-13606193016email:
info@suhangmachine.comAug 18, 2025
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.
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.
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.
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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