Why Does Mold Keep Forming on One Area on my Ceiling?!

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Mold can only grow on the inside of a home when adequate conditions are present. One thing that we sometimes encounter at Insulwise is mold that continues to grow on one area of a ceiling (but it could also be a wall). We have found this often occurs when there is a lack of insulation in that specific area. A lack of insulation will allow for water vapor that is in the air to condense on that spot when it is cold outside. Over time, that area can experience mold growth. The solution is properly insulating the area in question, so that it's surface never falls below dew point temperature (the temperature at which water vapor condenses from a gas to a liquid).

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Опубликовано:

19 июл 2023

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Комментарии : 8

@Lughnerson 8 месяцев назад

I have seen this problem often.

@insulwiseenergycomfortsolu3293 8 месяцев назад

We do as well. The next time that you do have a look in the attic space above if the area in question is below an attic. We would air seal and re-insulate the whole attic, but in a pinch the problem can likely be fixed just by placing some fiberglass insulation over top of the ceiling area where the mold has been forming. If the surface of the ceiling or wall does not regularly get below dew point temperature, than water vapor will not accumulate there and the mold should stop growing. Andy

@just_some_guy_11 2 месяца назад

So make sure there are baffles in place that are properly installed from roof sheathing to exterior overhang soffits and then blow the insulation tight to the baffles to insulate past the top plates?

@insulwiseenergycomfortsolu3293 Месяц назад

If you have vented soffits, you want to first get the baffle down into the soffit area, we shoot for about 2-3" past the top plate. Then use something like a softly wadded piece of fiberglass to block between the top plate and baffle, then blow in your insulation. If you don't block between the baffle and top plate, you'll fill your soffits and block the vents there. Andy

@seagalsteven_f1779 6 месяцев назад

Did you remove the baffles?

@insulwiseenergycomfortsolu3293 6 месяцев назад

To make the repair we pushed the fiberglass batt further out over the exterior wall top plate to get an effective layer of insulation over top of this area. We did not need to remove the baffle to do this.

@horsefamily32 3 месяца назад

Will this drywall need to be torn out entirely now and replaced once the problem is resolved? It's a porous material so I wouldn't think you can kill the mold.

@insulwiseenergycomfortsolu3293 3 месяца назад

@@horsefamily32 The drywall here has several layers of paint on it, so you can usually kill the mold on the surface and remove the staining. If you have solved the underlying reason for why water vapor is condensing there, the mold should not grow back. Unless the drywall has been seriously degraded, I wouldn't see a reason for its removal.