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There's a big difference between EPS and XPS when choosing polystyrene boards for insulation purposes.

There’s a big difference between EPS and XPS when choosing polystyrene boards for insulation purposes.

 

Polystyrene is not like Polystyrene: There are many different uses for many different types of polystyrene.

Not all polystyrene sheets are usable for insulation.

For example, if they were made for packaging purposes, they probably don’t have many benefits for insulation.
In addition there can be  safety implications: Polystyrene is highly flammable, that’s why it has been treated with flame retardants when manufactured for insulation purposes.

There are two different types used for insulation: EPS and XPS, with XPS being the much more efficient option:

EPS = Expanded Polystyrene Insulation is less dense and cheaper than the other polystyrene insulation. It is also less effective.

XPS = Extruded Polystyrene Insulation is more expensive but also more effective:
– XPS is more moisture-resistant than EPS
– XPS foam holds R-value better than EPS

So when you’re looking for insulation for your home, make sure you ask for fire-safe XPS. 🙂

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