There are actually several different reasons that might be responsible for the mold to appear under the house roof… and sometimes compromise your real estate transaction. That is why attic evaluation and attic mold treatment (if you’re out of luck) should be performed before even putting your house on the market, and on regular basis.
Depending on your house interior and roof framing design, cathedral ceiling ventilation can be treated as an independent, or attic ventilation related condition. As much as regular attic ventilation is an important part of your house maintenance routine and usually easy to perform, cathedral ceiling ventilation maintenance might be difficult or even impossible to do.
Majority of problems with cathedral ceiling ventilation develop in structures where the ceiling framing, and roof framing are the same. What it means, that there’s no accessible attic between the ceiling and roof surface, only narrow, rafter / truss space which should be partially filled with insulation. [...]