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I have noted two spots in my garage were developing mold spots over the last couple years. Upon cutting the drywall, I was able to determine that this was due to the fact that an uninsulated a/c duct/register were immediately behind the drywall. It appears as though condensation is being created by the temperature differential between the hot/humid garage air and the cold/dry A/C duct. How can I best correct this?
I have noted two spots in my garage were developing mold spots over the last couple years. Upon cutting the drywall, I was able to determine that this was due to the fact that an uninsulated a/c duct/register were immediately behind the drywall. It appears as though condensation is being created by the temperature differential between the hot/humid garage air and the cold/dry A/C duct. How can I best correct this?
You need to remove all affected sheetrock and insulate. Be certain to wipe the exterior of the ducts down with a chlorine/water solution to kill spores on the exterior ductwork. Since you may also have mold growth on the interior of the ducts it is best to call out a professional duct cleaner who can clean/treat the ducts. Check for mold in other parts of your home as the spores spread relatively easily.
Shortly after buying the house (3+ years ago) I had the house mold tested via air sampling in multiple locations throughout the home (the house is 37 years old) and it came out very low in terms of mold spore count, so I feel pretty good that this is an isolated instance. Regarding insulating...this may be a stupid question, but how do I do it? The duct work is insulated until it reaches the wall, but then it is locked in really, really tight within the studs and drywall. Thanks for the information!
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