EPS is said to breathe. What does this mean?

The breathability characteristic of EPS refers to its ability to allow any absorbed moisture to escape when conditions change. It therefore reduces any tendency towards the formation of vapour dams.

In applications where high humidity and temperature differentials are likely, a water vapour barrier such as plastic sheeting should be used. The vapour barrier is best installed on the warm side of the structural component, with the insulation as near as possible to the cold side.

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