1st off, IS there a sub-floor exterior perimeter drain ? if so, is it working properly ? when it collects water, does the wtr drain downhill OR must it be pumped somewhere ? thinking of your living room as a ship's hull below the waterline often helps 1 resolve problems,,, sometimes it doesn't matter where the water's coming from when you have problems in below-grade single-story homes,,, that's not to say you fix a problem that doesn't yet exist on the other side of the house OR that you ignore faulty siding, etc