■ Check for standing water in the basement, water marks on the walls, musty smells.
■ Make certain your home’s airtight barrier is properly installed. Improper installation lets water penetrate and mold can grow where you won’t see it.
■ Have home inspector look for mold, or signs of water damage.
■ Investigate home history to discover if the house has a history of mold growth, or conditions that lead to mold growth, such as bursting pipes and leaking windows.