Gravity plates are not limited to basic room testing. When used strategically, they can reveal hidden problems in specific environments or materials.

Differential Testing (Before and After Agitation)

This method involves taking two samples in the same space: one before any disturbance and one after. The idea is to compare mold levels under normal conditions versus levels after gently agitating the area. For example, you might test inside a cabinet by taking one sample with the door closed and the interior still, and another sample after tapping shelves or shaking items.

This comparison reveals whether spores are becoming airborne when the space is used, which is a critical clue when assessing hidden contamination.

Other Targeted Applications:

• Enclosed Spaces (Cabinets, Closets, Drawers): Test the air inside before and after light disturbance to detect spores that settle out of view.
• HVAC Differential Testing: Place a plate near a vent while the system is off, then take a second sample while the air system is running to detect spores traveling through ductwork.
• Furniture or Belongings: Tap-test soft goods like cushions, rugs, or stored clothing to see if mold-contaminated dust is being released.
• Swab-to-Auger Transfers: Roll a surface swab across a gravity plate to culture a specific sample and identify viable mold species.
• Vehicle Interiors: Place a plate on the seat or console for an hour with windows closed. For added insight, test again with the HVAC system running to check for contamination in the air vents.

These applications expand the usefulness of gravity plates beyond basic room tests. While simple, they can provide highly valuable data when used creatively and compared thoughtfully. If the results are unclear or seem concerning, working with a medically-sound Indoor Environmental Professional is always a smart next step.