What this video covers
The clip shows a basement remediation at the top of the cost range.
The full floor was affected, structural timber was compromised rather than just marked, and the HVAC system had carried spores into the rest of the house. The scale comes from that combination rather than from the surface area alone.
The takeaway
Basements combine persistent moisture, absorbent materials and an air handler that distributes the result. It is the most expensive place in a house to leave a damp problem alone.
Read the full written guide: Basement Mold Remediation Guide.