It is common knowledge that mold is everywhere. Fungi, which
include mold and mildew, make up more than one-quarter of all life
on earth, and some molds contribute significantly to our quality of
Mold needs these four key factors to grow.
Moisture and organic food are the easiest to manage in
Recently, there has been increasing interest in the potentially
damaging health effects a small number of mold species can have.
These effects raise concerns for those involved in the roofing
industry because mold increasingly has been found in commercial
roof assemblies and can affect indoor air quality. In many cases,
the ceiling plenum, which is in contact with a roof assembly,
becomes the return air duct for a building.
Occupied buildings with interior moisture sources, such as
recreation centers, paper manufacturing and food-processing plants,
multifamily buildings and schools, can generate water vapor, which
must dissipate or be ventilated so it does not accumulate
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