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Dark
Lines on Interior Walls
Dark Lines on Interior Walls Caused by Condensation and Dust Particles
By Mark J. Donovan
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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.
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If, for example you were to measure the inside wall temperature of your home
using thermocouples you wood see a marked difference between the temperature of
the wall near the wall stud versus in the area between the wall studs where
there is fiberglass insulation.
Because of this cold surface area on the inside wall and the warm moist air
within the home, condensation forms over the inside wall surface where the wall
stud sits behind. This condensation translates into extremely small water
droplets forming on the inside walls along the lines of the wall studs. This
moist surface area enables airborne dust particles within the home to stick to
the surface of the inside wall along the wall stud lines. Over time dark lines
will begin to become visible.
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Also, if you have a cathedral ceiling in your home, it is not uncommon for the
dark lines to form there as well, particularly where the ceiling meets the
walls. This is due to the fact that there is little to no spacing between the
roof rafter and the top wall plate of the wall with a cathedral ceiling. The
cold air temperatures permeate through the roof rafter to the inside ceiling
surface. As is the case with the inside walls, dark lines on the ceiling form
near the wall edges. |
To eliminate the dark lines, you can
try washing, but in the end a new paint job is usually required. To best way to
eliminate the formation of dark lines is to prevent them from forming in the
first place. To do this, you should reduce the moisture level within the home
during the cold seasons by using a dehumidifier. In addition, make sure you
regularly change the air filters in your heating system if you have a hot air
system. Blowing dirty air throughout the home is not only bad for your walls,
but also your health.
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