I'm starting to look for my first home and have decided on an area that consists of mostly 1920's to 1940's homes, and of course they all have stone foundations. I'm fairly experienced with concrete foundations and the problems that go along with them but I've never dealt with stone foundations.

Basically, I'm looking for a little advice of things I should be watching for as I look through these homes and any advice that you guys have for properly maintaining a stone foundation.