I have a 2 story house in NW Ohio. The bottom 5 ft of the foundation below ground are old stones (built in 1902) and the top 2 ft above ground is brick. The foundation is starting to leak. I was going to put new mortar in where it is gone but I don't know whether to use Portland cement - Quikrete which is considered a "hard" cement or a "soft" (more lime) cement. I am presently going to fix the inside and see if that solves the problem. If I need to use "soft" cement, I need help finding where to purchase this. Is there anything else I need to know to fix the stone?