Upon a buyers inspection request we found that we had mold in the attic. Some, we were told, has eaten into the sheathing and the rest of the house is just covered with old mold and we've been told can be sprayed and covered. We do have to replace the sheathing in one part of attic. We were also told that inadequate ventilation and condensation was basically the cause. Goes to show that if things aren't done right the first time it trickles down. You roofers out there, do the jobs right!!