Black Mold On Attic Rafters
You have mold that should be removed.
Black mold on attic rafters. On the east side only there is black mold for the first 6 up the slope. Attic feels excessively hot or stuffy attics should feel breezy if they are properly ventilated. Black mold can also grow behind the walls or attic ceilings completely undetected until the occupants smell the presence or experience health problems. At the south end of the roof the ridge changes direction causing an overlay condition.
Walls that are improperly insulated may develop mold because they will absorb moisture from outside. The black mold is on the first 3 truss panels. Add bad ventilation and high humidity level and you get perfect breeding grounds for black mold. The surfaces that black mold will grow on in your attic in the attic the most common places to find black mold are the places where water is likely to be a problem.
Dark black staining on wood surfaces if the wood in your attic shows any black discoloration the problem has moved beyond moisture. Skips a few trusses and reappears on the next panel or two.