Mold on back side of drywall
Stachybotrys – This is the black mold that has garnered all the media attention.
It is uncommon in an indoor environment.  However, if cellulose material, such as
drywall, has sustained water source over an extended period of time, it can
grow. In this case, a basement in Birmingham, Michigan had a leaking radiator
that had gone unnoticed for several weeks.
Stachybotrys - Black Mold
Leaking toilet causing mold in basement
Leaky Toilet - In many cases, mold is present in homes due to lack of
maintenance.  In this case, a toilet wax ring needed replacement and was
ignored, causing the subsequent damages shown in this photo.
Furnace Room - In many apartment and condominium properties, the furnace
room is on the exterior of the building.  Leaking from poorly maintained siding or
roof flashings and occasionally condensate lines from air conditioning units will
allow water and drywall to mix creating the conditions seen in this photo.  This
condition can be problematic because as the mold grows, it releases spores
which can enter the HVAC system and be dispersed throughout the entire living
Mold in an exterior furnace room
Furnace Exhaust (Cause) - In this photo, a roofing contractor, while replacing
the flashing around a furnace exhaust chimney, inadvertently disconnected the
furnace exhaust, causing warm moist air to enter the attic cavity.  The results can
be seen on the next photo.
Disconnected furnace exhaust
Furnace Exhaust (Effect) - The warm moist air is introduced into an attic cavity in
the winter months when the exterior temperatures are cold, condensation can
form on the sheathing and rafters causing microbial growth.
Mold in an attic
Venting (Cause)– Even though the flex line is properly vented to the exterior of
the structure, it is not secured properly to the galvanized duct work causing
warm moist air to enter the attic cavity.
Unsecured flex exhaust line
Sheathing (Effect) – This photo depicts the affects of the improperly secured
flex line from the previous photo.
Mold on roof sheathing
Front View, Sandwiched Drywall – In commercial or multiple dwelling
settings, two layers of drywall are commonly used as a firewall between
individual units. When water permeates from the inside, it can wick up by
capillary action, causing hidden microbial damage, as shown between the
drywall layers in this photo.
Mold on front side of drywall
Back View, Sandwiched Drywall – In this photo, you can see mold inside
walls typically is two to three times more than what is visible on the front side.
Sanding & HEPA Vacuum – In many cases, structural lumber such as the
ceiling joists shown in this picture, can have the mold removed by sanding.  A
HEPA vac is used to minimize spore dispersal during this process.
Sanding with a hepa vacuum
Negative Air & Dehumidification – Specialized equipment is used for mold
remediation.  The tube exhausted to the exterior is connected to an air
scrubber which is utilized to create negative air in the work area to minimize
cross-contamination of mold spores during the remediation.  Dehumidifiers are
occasionally used to assist in drying structural members prior to remediation.
Dehumidifier and Negative Air Exhaust 2
Office: (734) 260-3410      Fax: (734) 895-7251
About Mold
Painting, Inc.