What is the R-value of this board?

It is rated R-5.78 at 1 1/2 in thick. That is lower per inch than polyiso or XPS, so it suits thin layers rather than high-R walls on its own.

Can I use it in a basement?

Yes, it is commonly used on basement and crawlspace walls. EPS absorbs moisture, so pair it with a vapor barrier and keep it dry.

Score it with a utility knife and snap it, or use a fine-tooth saw. A straight edge helps keep cuts clean.

In most interior uses, rigid foam must be covered with drywall or another approved thermal barrier for fire code. Check local rules.

No. It is insulation only and does not add structural strength, so it goes alongside framing, not in place of it.

XPS gives a higher R-value per inch and resists moisture better. EPS is lighter and usually the simpler choice for basic thermal breaks.

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