Mold on Wood

Wood can typically be cleaned and retained when the following conditions are met:

• Mold growth is on the surface only (not deeply embedded)
• The wood is structurally sound (not soft, rotted, or crumbling)
• Moisture readings meet the project dry standard or appropriate unaffected reference material
• The moisture source has been identified and corrected
• Growth can be removed by surface cleaning methods

Several methods are used to clean mold from wood surfaces, often in combination:

HEPA Vacuuming

A remediation plan may use a sealed HEPA-filtered vacuum to collect loose surface debris. Sequence it with containment, dust control, damp cleaning, and any mechanical removal so the process does not spread particles.

Sanding and Wire Brushing

For surface mold on unfinished wood (studs, joists, sheathing):

1. 1

   HEPA vacuum first

   Remove loose contamination before mechanical cleaning.

2. 2

   Use appropriate tools

   Wire brushes, sanding sponges, or power sanders depending on the surface.

Wet Cleaning

After mechanical cleaning, a damp wipe with detergent solution removes remaining surface contamination:

• Use clean water with mild detergent
• Wipe with damp (not wet) cloths
• Work in sections, using fresh cloths frequently
• Allow wood to dry completely after cleaning
• Do not saturate wood with cleaning solution

Professional remediation decisions depend heavily on material porosity. Porous materials are harder to clean reliably; non-porous materials are usually easier to clean after the moisture source is fixed.

Wood structural members such as studs, joists, and rafters are often good candidates for cleaning when they are structurally sound and can be dried. See our standards guide for more on IICRC S520.