I have a problem with my fieldstone foundation. One of the large interior rocks (3’ x 2.5’) in the foundation wall is starting to crumble and the rock is weak. Half of the rock has fallen away and the remainder is not structurally sound. Unfortunately, the rock contains a large amount of metal or minerals and they appear to have oxidized over the years. The house was built in 1895 and is located in Massachusetts.
Is this a common problem with fieldstone foundations?
What solutions are available for this problem?
Picture of rock in wall.
Angled view of wall.
Close up of rock.
Note. The rest of the foundation is in really good condition. The basement doesn’t flood and has low humidity.