Mould under the house: what you can do, and when to stop
Do not treat a heavy subfloor as a weekend wipe. Photograph it, fix drainage and airflow, and call a professional for widespread growth. First Light and the Protection Kit are for the rooms above and any reachable skirting, not a crawl-space spray job.
The usual scene is a raised Australian home, often a Queenslander or a Gold Coast timber house, with a damp subfloor after rain.
What you can safely do
A daylight inspection, photos, cleared drains, open vents, and soil kept off timber. Wear protection if you go near it. Renters: write to the agent with date-stamped photos. Use the renters guide. This is not legal advice. Do not crawl in and dry-brush spores around the space.
When to call a professional
Widespread growth, wet soil that does not dry, structural timber concerns, or a smell that comes up through the floor. That is the stop line.
The rooms above still need treatment
If the smell or the damp is in the house, treat those rooms. First Light on surfaces you can safely reach above. Lab tested: 99.2% on direct contact. The Protection Kit for still rooms. Neither is a substitute for a subfloor professional.
Shop First Light, from A$39.99 Shop the Protection Kit, from A$79.98
The rooms above still need treatment
If the floor itself is the issue, see mould on timber floors. If this started after a storm, see mould after rain and storms.
Questions people ask
How do you treat mould under a house?
Widespread subfloor mould is a professional job. You can photograph it, fix drainage and keep vents open. Do not crawl in and dry-brush it.
Will a diffuser fix under-house mould?
No. The Protection Kit is for the rooms above. The subfloor still needs drainage, airflow, and often a professional.
I rent, and the subfloor is mouldy. What do I do?
Date-stamped photos and a written request to the agent. Use our renters guide. This is not legal advice.
Aurala is a Gold Coast business. Shop First Light or shop the Protection Kit for the house above.
