Mapping a musty odor in the crawl space

Use room boundaries, airflow and timing to narrow an odor pathway.

Set the reference

Photograph the whole location and a close detail. Include a fixed reference and record what lies above, below, behind or outside.

Capture the trigger

Note weather, water use, occupancy and equipment state. A useful guide connects the observation to the condition that produced it.

Use the right check

Apply the linked non-destructive check and compare with a nearby normal reference.

Choose the next branch

Follow the most plausible cause dossier, but preserve alternatives until a distinguishing clue appears.

Close the loop

After correction, repeat the same observation under similar conditions and store the result in the house log.