Condensation like drips along inside top of external wall

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  #1  
Old 12-15-13, 12:38 PM
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Condensation like drips along inside top of external wall

We bought a new house this summer and so this is our first autumn in it. If the past six weeks, but twice in the past two, we have noticed drip marks coming down from the ceiling inside his room, along the external wall.

What could be causing it?

It's not wet, but faintly damp, more marks on the paint. Could this be gutters needing cleaned? Problems with ten bricks (the exterior walls are all brick, 1960s), or a roofing problem?
 
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Old 12-15-13, 01:05 PM
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The area you are describing is known for limited space for insulation and a lot of wood framing (double top plate) which combine to make it rather cold up there. Add in high humidity levels inside the home and you get condensation. If this is the problem, start with a meter to measure the humidity. An inexpensive one is fine. If above 35% then there are steps you can take to lower it.

Another water source is ice damming. Do you have snow on the roof and some visible ice?

Bud
 
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Old 12-16-13, 10:20 AM
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In case you are unaware of what ICE damming and its causes and effects look like, is there a large accumulation of icicles at the edge of those shingles, on or near the gutters, or by the the eves? After a heavy snowfall does the layer of snow on your roof stay there pretty evenly until the sun starts to melt it off gradually, or does it start quickly melting off in uneven chunks even if the temps are below freezing and there's no direct sunlight?
 
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Old 12-17-13, 06:44 AM
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Guess 1 is going to be ice dams.

Guess 2 is going to be improperly vented bath/exhaust fans diverting moisture into the attic and not out of the home.

Picture will help here.
 
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Old 12-25-13, 01:56 PM
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Thanks everyone, we haven't had snow yet, or ice, but it seems to correspond with fierce wind and rain storms...
 
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Old 12-26-13, 06:36 AM
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Please post up a picture.

Any penetrations in that roof section?
 
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