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Old 01-02-2014, 07:01 PM   #1
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Ghost spots on drywall


Hi,

First time user-- I recently had new siding and roof put on my split level home (Oct 2013), all old removed and house wrapped. I recently noticed black shadows or spots that are in a vertical line in several areas near the upper interior wall in the foyer. I've lived here 20 years, home built in 1979 and never have had this before. December has been a cold month, living in the midwest area. Does anyone have any ideas? I've tried to read about thermal bridging or tracking, ghost spots, etc. Any suggestions would be appreciated. Thanks-

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Old 01-03-2014, 01:35 AM   #2
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Ghost spots on drywall


if you could post some photos so we can see what your trying to describe to us. So we can help you better.

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Old 01-03-2014, 05:26 PM   #3
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Ghost spots on drywall


Thanks. I have a couple pics just need to figure out how to attach them.
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Old 01-03-2014, 08:27 PM   #4
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Ghost spots on drywall


What you are describing is called 'soot staining' or 'candle staining'

As you have figured--condensation settles on cold spots in the drywall--then airborne dust and soot sticks to the condensation.

I doubt if the new roof or the new siding is causing it---possible ,I suppose--but not likely---

Do you burn candles? have a wood burning stove? Have a smoker in the house?
Stir fry frequently?
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Old 01-03-2014, 08:51 PM   #5
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Ghost spots on drywall


Thanks- I can answer no to all your questions. I'm assuming since the cold spots/condensation were not there with the old 32 year old siding, that applying the new wrap and siding is more inefficient than the old was. (-; If this is the issue do you think this will go away with warmer conditions? Become a permanent stain? The spots are lined up in a pattern so we were thinking nails from the wrap or siding…. Just questions I'm throwing out there. Thanks again.
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Old 01-03-2014, 09:43 PM   #6
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Ghost spots on drywall


We've had some odd weather this year---when was the interior of the house painted last?

Have you added a humidifier to your furnace or had higher inside humidity lately?

Soot staining usually takes several year of accumulation before it is dark enough to notice----
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Old 01-03-2014, 09:58 PM   #7
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Ghost spots on drywall


Interior of home last painted 11 years ago. The humidity is very low in the house, probably should be higher as a lot of static. Could the "possible" condensation on wall turn into mold? I'm having it looked at by a builder friend next week to give his opinion. I have a couple photos but no clue as how to attach. Again thanks for your time.
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Old 01-03-2014, 10:26 PM   #8
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Ghost spots on drywall


no mold issues---it's just dirt---after 11 years what you are seeing is rather normal in colder climates----I have a wood stove---so I get the soot staining---and need to repaint every 5 to 6 years---

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