Section Contents

Exposure Durability Classification or Bond Classification

Bond classification relates to moisture resistance of the glue bond and therefore to the structural integrity of the panel.  Bond classification of the panel does not relate to physical (erosion, ultraviolet etc.) or biological (mould, fungal decay, insect etc.) resistance of the panel.

Exposure 1 OSB panels

  • These are manufactured with the same adhesive used in exterior plywood panels but are not suitable for long-term exposure to the weather.
  • They are intended to resist the effects of moisture due to construction delays, or other conditions of similar severity.

Equivalent EU standards