Have You Seen a Ghost?
Ghosting in homes. What is it & do you need to worry about it?
We inspected an apartment building last year where one of the tenants had a concern they wanted to show us. Then they pointed to the ceiling. There on the ceiling, which was painted an off-white color, was a grey stripe.
The tenant explained that they had washed it off, and it came back. Then, they painted it over, and it still came back. It was making them crazy. They wanted us to tell them what it was and how to get rid of it. We think it was a ghost! As home inspectors, when we see something like this, we have to do a bit of detective work.
We see a lot of strange things in this business. It isn’t always obvious what is causing the problem. This tenant had a stripe on the ceiling commonly known as “ghosting,” where you can see outlines of things behind the surface. See the picture at right for an example of wall ghosting.
“Ghosting” occurs for two main reasons. The first is the presence of particulates in the air. Those grey stripes are caused by the particulates settling on the surface and creating a stripe.
So, why do they only settle on that stripe?
There are several reasons this may happen. The most common is the temperature differential. If the temperature is cooler at the stripe, the particles tend to settle out of the air as they contact the surface. This phenomenon is known as plating or condensation. Maybe we should call it condensing plating instead of ghosting. But, enough of the boring science.
Back to my apartment friend. In this case, I suspected candles in the apartment had something to do with the problem. Those candles produce soot. Soot particles are heavy and easily fall out of the air onto a surface.
Secondly, during our inspection of the building, we learned some piping running to another apartment located immediately above the ceiling in the living room. The combination of the soot in the air and the cooler temperature of the ceiling near the piping was causing the ghosting. No matter how much they clean or paint it, the stripe will return as long as those two factors remain.
In the case of the obvious wall studs shown in the photo above, the ghosting is on an outside wall. What this tells us is that the cold outside air is transmitting through the studs. There is probably significant heat loss here.
Also, there might be a lack of an adequate vapor barrier. More information, in the way of thermal imaging or an energy audit, might help solve this problem and determine how best to fix it. A good solution here might be to install rigid insulation (approx. 1” thick) to the studs’ surface, then sheetrock over that.
Another common example of ghosting is the plumes of dust that we see outside of a home with vinyl siding. The plumes are usually at vinyl siding overlaps and, most often, worse on the home’s north side. In this case, the pressure inside the home is higher at times, so the inside air moves out through the insulation and releases outside at the seams in the vinyl.
Once outside, the warmer air contacts, the cooler vinyl tends to condense and stick to the siding. When it dries, all you see is a “ghost” of the moisture. The dust and soot from inside the building are now left on the siding. Again, this is not a problem on its own but tells us something about the house, especially the positive pressure we see.
Should I worry about this?
Generally speaking, this is not something you need to worry about. The ghosting itself is not a problem, but it might be a symptom of other problems. If the temperature differential is enough, condensing moisture will settle out, leading to mold and rot.
What are some remedies?
Consider that the ghosting is telling you something about the air itself. It is not clean. There are heavy particulates in the air, and you are breathing those.
If you burn lots of candles, consider reducing that. If you smoke, quit, or at least smoke outside. If you burn with wood, coal, or pellets, you may have an inefficient heat source causing some soot leakage.
Have all your heat sources cleaned and serviced? Have us do an air test for you to test exactly what is in your air. These are most often in areas of temperature differentials. Do you need to improve your insulation in this area? Other options for insulation and ventilation may need to be considered.
KEY POINT TO REMEMBER
Don’t ignore ghosts! Contact us to help you understand your home better and live healthfully!
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