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Dark Lines on Interior Walls Caused by Condensation and Dust Particles By Mark J. Donovan Dark lines forming on the interior walls or ceiling of your home is a phenomenon associated with condensation forming inside the home. The dark lines form due to a combination of outside cold air temperatures and dust particles within the home. Unfortunately wall studs or framing studs are good conductors of cold temperatures. When the outside air temperature is cold, the wall studs transfer this cold to the inside walls. If, for example you were…https://homeadditionplus.com/dev/wp-content/uploads/2018/06/dark_lines_on_Ceiling.jpg441241