We'd been in our "new" 1928 house for about a week when there was a big snow melt and rainstorm and a large wet spot appeared on our finished basement carpet. I called Mayday to investigate and give me an opinion on our drainage situation. Roy came about a day after we talked and checked our drain with his camera (he tried both the main drain and the toilet, and although initially thwarted by some improper T-junctions managed to get a look after taking a different approach and doing some augering -- free of charge). He was able to determine that our problem was seepage by examining the various pipes heading into our drain, as well as inspecting our basement walls (drywall had been partly removed for another reason so he could see them). This really scared me because it was starting to look like a very expensive fix, i.e. an excavation from the outside...which in our case would have meant busting up a lot of asphalt on a mutual driveway and tearing down a brand new deck. Roy suggested we try an interior weeping tile system under the basement floor, which would set us back $2750 instead of $20K+. Within a few days his colleague Victor had a crew in our basement installing the system...which was done quickly and neatly...and about a week after that, we had another big melt and rainstorm, complete with flood warnings for the City of Toronto. I bought a pair of rubber boots and put all our books in big Rubbermaid containers, but our basement was dry as a bone. Our house turned out to be a lemon, but our basement appears to be okay now and at dramatically lower cost than it might have been.