Drafty window dispute freezes conflict resolution

In reference to the Atlanta stalemate, and the window problem, I can tell you that most window leaks are cause from improper installation not the actual window. I am going to assume that the homeowner bought a good window. It would be my guess that proper insulation and caulking was not packed between the window jamb and the building. Part of this can be corrected with some of the spray in foams such as that found at builders supplys. This said, this is not the greatest problem. Air leaks will also mean water leaks so the windows were prehaps not properly caulked. The solution will most likely be suggested to face caulk but this is not the best. Caulking manufacturers have clear instructions on the size and installation of caulk for long term performance. Water intrusion can result in mold, and over time structural damage. I suggest the owner call a waterproofing company in to look at the problem. Having not seen the deck or windows this suggestion is what it is; however the deck problem may be solved by trim to close the gaps much like trim around doors, baseboards etc.