This Linden, VA homeowner had mold growing on the drywall in the garage ceiling that was causd by the HVAC duct work above the drywall sweating in the summer time. This duct sweating is caused by hot/humid air hitting the cold metal ducting. This makes the air hit dew point and sweat. Then, it dripped on their drywall and over time caused mold to grow.
Comfenergy removed and disposed of the dryall where the mold was growing. Then, we completely encased the metal ducting with closed cell spray foam to air seal it and protect it from the hot/humid air entering the cavity the duct runs through.
This before and after shoto series shows a vertical wall adjacent to an attic. Poorly insulated walls like this can allow hot air from the attic to radiate through the drywall and heat the room on the other side. Closed cell spray foam keeps the heat away from the wall and protects it from heating the room on the other side!!