My house has a sandstone basement. Outside when I removed some plaster, I noticed sandy erosion and deep cavities in the sandstone where mice often gain access to the house. How do I seal these cavities? Use expanding foam or push in some kind of mortar? And what do I plaster it over with again? I then hope to insulate the wall with styrofoam down to the footing. Please advise me. Thank you sincerely. Patrick Owens.
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