Testing for mold is notoriously difficult in attic spaces. That’s because the indoor air quality test is often confused by insulation materials in the air. So while a basic air sample might have passed in this attic, it wouldn’t have told the whole story.
A closer visual inspection was more telling. There were signs of black mold on the underside of the roofing material, and enough of it that indicated a moisture issue. The buyer now had a choice — accept the condition, ask for remediation before the deal, or walk away. In this case, the seller footed the cost of having mold experts clear the problem.