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Is 40 PSI XPS board a overkill for basement under slab insulation?

mqcola
last month

Hi, we are planning of having R-10 insulation board installed before having our basement concrete floor poured.

I have been searching/talking with some manufactures and the products range from 16 PSI ( less expensive) to 40 PSI. I would like to hear your experience if a 16 PSI or 25 PSI would be sufficient or it would be too weak and " crash" ( lack of better word) when concrete floor is poured.

We will be using a rigid insulation 1" ( R-5) on the walls before the baten insulation.


Thanks for sharing you experience.



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