filling voids in fieldstone / rubble foundation?
Old house on a fieldstone / rubble foundation. The exposed portions of the foundation are pointed with mortar. The NON-exposed portion (i.e., exterior and below-grade) of the foundation is a loose jumble of random-shaped fieldstones that flares outwards to a width of several feet as you approach its base. The stones throughout have substantial voids between them. Unclear whether this has always been the case, or whether 200 years of water has washed the fines into the cellar.
As I work to improve grading around the perimeter and install underground gutters beneath the eaves, I have easy access to the very top of this void network. Should I do anything to fill them?
The voids are substantial enough that either pea-gravel and a watery concrete or mortar would somewhat flow into them. The local vole and chipmunk populations would be very unhappy with me.
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