All too common bathroom and home problem in cold climates. The infrared picture shows where the poorly laid fiberglass is causing extreme dips in ceiling surface temperature. The temperature is dipping below the dew point, causing bathroom moisture to condense and spurring some surface mold growth. Yummy!
Related links:
What is Humidity?
What is Dew Point?
How Do I Control Humidity?
What is a Vapor Barrier?
Mold...check, Infrared showing why there's mold...check
