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Thermal Expansion in Recycled Plastic Decking: How to Size Expansion Gaps

Rule-of-thumb gap sizing with ΔL = α·L·ΔT and practical installation notes.

• 7 min • By Ezotrade Editorial
Thermal Expansion in Recycled Plastic Decking: How to Size Expansion Gaps
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Why Expansion Matters

Recycled plastics expand with temperature. Design for seasonal swings and long runs.

Quick Formula

ΔL = α · L · ΔT. Typical α range 0.08–0.12 mm/m/°C — verify with supplier data.

Installation Tips

  • Leave end gaps; pre-drill near board ends.
  • Use slotted fixings for long runs.