Challenges of Drying Buildings in Cold Winter Conditions

Cold air holds far less water vapor than warm air. When outdoor temperatures drop, the air's capacity to absorb moisture falls sharply, so evaporation from wet materials slows down. Even if you open windows, the incoming cold air does little to pull moisture out of soaked drywall, wood, or concrete.

Heating the building helps, but it creates a different problem. Warm air can hold more moisture, but without ventilation, that moisture condenses on cold surfaces like windows or exterior walls. This can lead to new water damage, peeling paint, or mold growth in places that were previously dry.

• Cold air holds less moisture, slowing evaporation
• Heating without ventilation causes condensation
• Ice can form in wall cavities, blocking drying
• Humidity levels stay high indoors in winter
• Drying time can double or triple in cold weather

In winter, you should rely more on dehumidifiers and less on natural ventilation. A dehumidifier removes moisture from the air even when outdoor temperatures are low. Place it in the affected area, keep doors closed to contain the space, and run it continuously until materials feel dry to the touch.

Use supplemental heat, but keep it moderate. High heat can cause rapid drying on the surface while trapping moisture deeper inside, leading to warping or cracking. A steady temperature around 70 degrees Fahrenheit with good air circulation works better than blasting heat.

• Run a dehumidifier in the affected room
• Keep doors and windows closed to control humidity
• Use fans to circulate air over wet surfaces
• Set heat to a moderate level, not high
• Monitor moisture levels with a moisture meter
• Consider using a wet-dry vacuum to remove standing water

Mold can start growing within 24 to 48 hours on wet materials. In cold weather, drying takes longer, which increases that risk. Keep the area as dry as possible, and if you see or smell mold, see a doctor if you feel unwell and consider hiring a mold professional to assess the situation.

Your insurance policy might help with water damage and mold remediation, but policies vary, and your insurer decides what is covered. Check your policy to understand what is included. Document the damage with photos and keep records of any drying equipment you rent or buy.