Mold growth inside homes 1

/, Investigation, Mold/Mold growth inside homes 1

Penicillium/Aspergillus Amplification within Structures


Atlanta Mold LLC News and Information


The most frequently encountered mold found upon inspection is Penicillium/Aspergillus type. Often referred to as mildew. This is a ubiquitous mold in the exterior world environment. It is responsible for the decay of much plant matter residing around the home. These types of mold cannot be differentiated by evaluation of the spores as they are almost identical. They belong to a class of fungi referred to as mitosporic – meaning the spores contain a complete genome. They do not require sexual reproduction in order to germinate and grow.

Of all the mitosporic fungi found in moisture insulted structures, Penicillium/Aspergillus is about the only type that does not require almost saturated water conditions. They can thrive in sustained relative humidity environments above 70%. That is enough moisture for the very small spores to hydrate themselves and turn on metabolic growth.



Examples of Penicillium/Aspergillus Amplification


Pen Asp

Penicillium/Aspergillus Type Mold

Universal and most often seen on fungally contaminated surfaces

Very small spores, thousands can sit on the eraser of a pencil

Thrives in elevated relative humidity environments, not water saturated

Mold on Surface

Penicillium/Aspergillus type mold in crawl space

Generally light gray to light green in color

Environmental causation - high relative humidity environment

Pen Asp growth on ceiling

Penicillium/Aspergillus growth on wall in finished basement

Light green colonies all over the wall

Hard to detect - must look tangent to the surface

Uncontrolled high air moisture - must use dehumidification

Mold growth

Penicillium/Aspergillus growth on bathroom vanity

This mold will grow on any surface in high moisture environment

Mold on door

Penicillium/Aspergillus type mold on closet door

How was this allowed to happen?

Uncontrolled air moisture in the home was the cause

Keep HVAC operating when you leave your home

Self Help Recommendations


Do not allow any part of your home to experience sustained periods of high relative humidity. If RH exceeds 70% for just a few days time, that is enough moisture to allow the ubiquitous Penicillium/Aspergillus spores to start to grow. In particular, take especial care of basements, closets, crawl spaces and any other non-conditioned spaces in your home.


For detailed consultation on your particular moisture intrusion challenges, please call Dr. Kraemer at 770.321.6653
By |2017-04-04T23:19:25+00:00April 4th, 2017|Construction, Investigation, Mold|