I own a one level brick home with approximately 1400 square feet of living space. The house is about 15 years old and I have owned for about 6 years. During the winter the ceiling and the walls in the kitchen, hall, hall bathroom and the bedroom across from the hall bathroom seperate from each other in places and then go back together in the summer. This problem has gotten progressively worse in the past two years. It is as the trusses in the attic are pulling the ceiling up. I am sure it is not the floor sinking. The main areas affected are in the center of the house. A person at Lowe's said this was common and the trusses were made to do this. I'm not convinced this is correct and even if he is correct, is still very unsitely.