So I’ve found a few questions ask that are similar to my question but not quite the same (and many of those are unanswered). I’ll ask mine and include some pictures in hopes that I’ll get some input.
I’m in a 100+ year old house with field stone foundation. The mortar, for the most part, is doing well except for the base of the very bottom layer where the mortar is disintegrating.
A cement floor has been poured by a previous owner that goes just to the edge of the bottom stones. Under the bottom stones is just sand.
It appears the mortar under this bottom stone is completely gone and the stone is resting on the sand.
I’d like to put mortar in these gaps after cleaning them up.
I know there are considerations for using the same type of mortar as was originally used in order to accommodate moisture. However, I was thinking of using a mortar that is more solid (being that it is the foundation layer) and not necessarily one that would allow moisture (given that I’m not doing all the wall)