I had a Worcester firefighter call us up. He lives in Hudson, MA and he had water coming into his finished basement. He couldn't figure out how it was coming in.
We told him to go outside and take a look at the wall where it seemed to be coming in from. As you know there can be anywhere from 3" of concrete to feet of concrete showing.
He went outside and sure enough he saw a hairline crack. We told him to go inside and open up that area in the Sheetrock where the crack was.
He opened it up, and sure enough, there was water coming in from that little crack. He was amazed that so much water could come in through a crack that small. He was also amazed that we diagnosed his problem over the phone. We went out and fixed the crack in the foundation and gave him a full-warranty. As a result, we have fixed a few more basement and foundation problems for some other Worcester Firemen.