My wife and I own a farmhouse built in 1880 in Central New York (Pompey, just south of Syracuse). We recently had the basement closed cell foam insulated. Shortly thereafter, we realized on the outside of the house, the joints between the rock foundation have deteriorated. I watched the video of Tom Silva from August of 2014, wherein he shows how to clean out and re- point a foundation from the inside and recommends the use of Type S Masonry Mortar (Quickrete) mixed with bonding agent. Can I use this same product on the outside? I am reading alot about the need to use a lime mortar as was used in 1880 because the modern concrete mixes will block in moisture and cause more of a problem. Is the Type S Masonry Mortar mixed with boding agent appropriate to point the outside?