Hidden mold behind walls? Here's how to find it WITHOUT tearing your house apart! ㅤ First, you need to figure out where you need to be testing, which is either: ㅤ 1: Any wall that had a historical water intrusion and hasn’t been remediated ㅤ OR ㅤ 2: Any wall that is showing signs of water damage ㅤ Once we know where we need to be testing, we use what are called cavity samples. We do NOT just use air samples in the middle of a room. HUGE no-no ❌ ㅤ Cavity samples pull the air from behind your wall