Prep · 6 min

Concrete moisture test before epoxy coating

Moisture trapped in a concrete slab is the top reason epoxy floors delaminate within months. A simple plastic-sheet test you can do in an afternoon tells you whether your slab is ready for coating.

What you'll learn

  • Why concrete moisture causes epoxy to delaminate and how quickly it can happen
  • How to perform the ASTM D4263 plastic-sheet test with materials from any hardware store
  • What the results mean and when a moisture barrier primer is required
  • Which San Diego neighborhoods have the highest concrete moisture issues due to soil conditions

Step by step

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Safety note

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