It could originate in wet insulation in the attic or drywall that was not properly sealed in the leak area.
Roof leak smells.
Their effects can linger long after the repair has been made in the form of mold growth on the interior surfaces of your home.
Mold can spread throughout the home s structure to the hvac system and then to the rest of the house through the vents where it can invade carpets furniture and even clothing.
Roof leaks present multiple challenges for homeowners.
In the longer term one of the most serious consequences of a leaking roof is mold and mildew growth.
Mildew is a growth usually white in color produced by molds and fungi.
If you have recently had to deal with any kind of leak in your home chances are you ve had to deal with mold and mildew.
Mildew thrives and grows in places that are damp warm and dark.
It is also possible that the odor results from the effects of the first leak.
The rubber gasket that surrounds the vent pipe could be rotted.
Check plumbing vent boots and roof vents if water is entering from that area to cause the leaking roof.