Is EPS degraded by UV?

Prolonged exposure to sunlight will cause a slight discolouration (yellowing) of EPS insulation and cause some surface embrittlement similar to erosion when exposed to constant wind.

Even so, thermal insulation properties will not be affected unless exposure results in loss of thickness of the EPS sheets, and therefore it is for this reason that EPS should be covered to protect it from UV light if it is to be applied or exposed to the elements for a prolonged period of time.

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