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Rubble Foundation Questions

2 months ago

Our house (circa 1880) has a rubble foundation, mostly in solid condition though the summer plans were to repoint anything needing attention. Clearing our first corner (inside) we noticed dirt and some water seepage in a couple spots at the base of the foundation where the slab had been poured. We figure this may have been a dirt floor with a slab poured later at the level of the bottom of the foundation, but no matter, our question is what we should do with the gaps were the stones don't dip below slab level to fill these voids where there is nothing but dirt?

In our preliminary research (we're noobs here) we've discovered some discussions about hydraulic cement, mortar, and concrete. Does anyone have experience with this scenario and advice for us?

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