I have a fieldstone foundation. As with most such foundations, the mortar is crumbling, and the sandy mortar is falling out onto the basement floor. I have just read that I need to remove crumbling mortar and point (to fill the voids with new lime mortar).
How aggressive should I be about removing existing mortar, and what is the best way or removing it? Should I use a steel brush, scrape with a chisel, or actually chisel away mortar? Should I be concerned if the mortar is crumbled and loose far into the foundation?
The basement is about 130 years old and has had no water leaks so far.