Have you been told that fogging will kill the mould in your home? Here’s the main reasons to avoid it.

If you’ve been told that fogging—or misting—can kill all the mould in your home, it might sound like a magic solution. But here’s the reality: fogging alone doesn’t effectively remove mould, and it won’t resolve the underlying problem.

What Is Fogging?

Fogging disperses a fine mist of chemicals or biocides into the air to “treat” mould, commonly advertised as a one-time, quick fix. While it might seem convenient, and cheap, here’s why it doesn’t work:

1. Fogging Isn’t Mould Removal
Official guidelines (like the IICRC S520) make it clear that fogging should never replace proper mould removal. Killing or deactivating mould spores doesn’t eliminate their toxic or allergenic properties, meaning even “dead” mould can still be harmful.

2. Limited Reach
Fogging cannot penetrate hidden areas where mould often thrives, such as wall cavities or ceiling spaces. Even in areas with visible mould, fogging doesn’t reach deep enough to address mould roots.

3. Can Worsen the Problem
Fogging adds moisture to the environment, potentially feeding mould growth. It can also disturb mould, causing spores to spread further.

4. Potentially Toxic Chemicals
Some chemicals used in fogging can be harmful themselves. And if they’re “chemical-free,” it’s worth asking how they can effectively kill mould.

When Is Fogging Useful?

Fogging has one valid application: AFTER physical removal of mould, AFTER mould remediation, to help capture airborne particles, bringing them down to surfaces where they can be removed during small-particle cleaning.

The Bottom Line: Don’t rely on fogging alone. Instead, invest in a proper mould remediation plan that effectively removes mould and prevents it from returning.