What Are the Risks of Mold in a Historic or Older Home?

Older homes often have materials that hold moisture, like lath and plaster, brick, and heavy timber. These materials can absorb water and stay damp for a long time, which gives mold a place to grow. Small leaks in roofs, pipes, or windows can go unnoticed for weeks.

Historic homes also tend to have less ventilation than modern builds. Tight spaces behind walls, under floors, and in attics trap humidity. If you live in a humid climate, the moisture can make problems worse. Acting quickly after any water event helps limit mold growth.

Mold feeds on organic materials like wood, paper, and fabric. In an older home, that means your floor joists, wall studs, and plaster can slowly decay. Over time, mold can weaken structural elements, leading to sagging floors or cracked walls.

Mold also stains surfaces and can be hard to remove from porous materials. Historic paint and finishes may be damaged, reducing the home's character and value. Catching mold early and drying things out can save you from costly repairs later.

If the mold covers a small area, you can often clean it with soap and water, but wear gloves and a mask. For larger problems, or if mold has spread into walls or under floors, call in local water damage pros. They can assess the extent and dry out the affected areas.

The pros may need to remove damaged drywall, flooring, or insulation. In a historic home, extra care is needed to preserve original materials where possible. Your insurance company may cover some mold damage, but policies vary. Policies vary, and your insurer decides what is covered.