Differences between single lock and double lock on standing seam

Jul 31, 2024

Standing seam metal roofs use either single lock or double lock seams to secure the panels together, each offering different levels of durability, weather resistance, and complexity in installation. Here's a breakdown of the differences:

Single Lock Seam

  • Construction: A single lock seam involves folding the seam over itself once (typically 90 degrees).
  • Installation: Easier and quicker to install compared to double lock seams, requiring less labor and fewer tools.
  • Weather Resistance: Provides good weather resistance but may be less effective than a double lock seam in extreme weather conditions.
  • Usage: Suitable for areas with moderate climates where heavy snowfall, high winds, or severe weather are less common.
  • Flexibility: Offers some flexibility to accommodate thermal expansion and contraction of the metal panels.

Double Lock Seam

  • Construction: A double lock seam folds the seam over itself twice (typically 180 degrees).
  • Installation: More complex and time-consuming to install, requiring more skilled labor and specialized tools.
  • Weather Resistance: Provides superior weather resistance, with enhanced protection against water infiltration, wind uplift, and other environmental factors.
  • Usage: Ideal for areas with harsh weather conditions, including heavy snow, strong winds, and heavy rainfall.
  • Durability: Generally more durable and longer-lasting than single lock seams due to the extra fold providing additional strength and security.

Summary

  • Single Lock Seam: Easier to install, adequate weather resistance, suitable for moderate climates.
  • Double Lock Seam: More complex installation, superior weather resistance, suitable for harsh climates, and more durable.

Choosing between a single lock and double lock seam depends on the specific environmental conditions, budget, and desired longevity of the roofing system.

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