What it is
Torula is a dark olive-to-black mold that grows on damp wood, paper, and other cellulose materials.
Where it grows
Damp wood - basement framing, crawlspace joists, water-damaged trim, ceiling areas under roof leaks.
Health impact
Allergy symptoms similar to other common indoor molds.
This species does not typically produce mycotoxins, though it can still cause allergic reactions and respiratory irritation.
Property risk
Signals moisture intrusion. Often co-occurs with other cellulose-degrading molds. Affected wood may need replacement if growth is extensive.
When to test
If you see what looks like torula in your home - or if a lab report flagged it in your air samples - testing the affected area against an outdoor baseline is the most useful next step. The decision about remediation depends on:
- How much is present (spore count per cubic meter, or visible square footage)
- What's beneath it (porous materials like drywall and insulation usually need removal; hard surfaces can often be cleaned)
- Whether the moisture source is identifiable and fixable
Our approach
For confirmed indoor torula colonies, our process is the same as for any mold species: identify and stop the moisture source, contain the work area, remove what's compromised, HEPA-filter and HEPA-vacuum the surrounding area, dry everything, and verify with a post-remediation clearance test against the outdoor baseline.