Mold on Drywall
Mold on Insulation behind the drywall
Foundation after wall material has been removed just before cleaning the wood.
Rotted wood in crawlspace due to poor grading and drainage at front of house.
Wet exterior wall at window due to poor caulking at window frame.
Mold on humidifier panel from lack of maintenance over the years. Good reason for poor air quality in a home.