I have a house which was built in 1890 in western michigan. The house is a fieldstone foundation. It appears at some point it was plastered or covered.
On the west side of my basement there also seems to be a bump out that appears to reinforce the interior of the foundation. This bump out seems to be full of sand and then plastered over the sand. Some of the plaster is cracking and falling off and I would like to repair/replace the damaged sections. I cannot find any information on what it might actually be or even if it is plaster. Does anyone have any insight on this?