Which sign could indicate chronic condensation problems in an attic?

Gray or black stains on the north side roof sheathing are indicative of chronic condensation problems in an attic. This kind of staining typically occurs in areas where moisture frequently accumulates due to inadequate ventilation or persistent humidity issues. The north side is particularly prone to such problems because it receives less sunlight, which can impede drying, allowing mold or mildew to thrive in areas where condensation collects.

To prevent and identify chronic condensation problems, it’s essential to maintain proper ventilation in the attic and ensure insulation is adequately installed. While a very warm attic might indicate other issues related to temperature control, it does not specifically signal condensation problems. Similarly, the absence of a vapor retarder on insulation can contribute to condensation issues but does not directly indicate that these problems are taking place. Lastly, mildew stains on bathroom ceilings suggest moisture issues but are not specific indicators of attic condensation problems. Thus, gray or black stains on the roof sheathing directly reflect the persistent moisture accumulation characteristic of chronic condensation.