I have an old house built in 1919. I have a red clay tile foundation with crumbling mortar. I don't have any serious water intrusion issues in the basement, but I was wondering if I could safely hire someone to excavate around the perimeter of the foundation to tuckpoint the foundation, appy a waterproofing membrane and drop some drain tiles in and run them to daylight. I'm scared about excavating around this type of foundation. I know that the soil around the foundation wall is probably providing some structural support and the last thing I want to do is weaken it when the purpose of this is to get more life out it. Is it safe to excavate around these types of foundations? They don't seem to have footings. Thank you!