How To Do Toxic Mold Inspection of
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Email Phillip Fry or call toll-free 1-866-300-1616
or Phillip's cell phone 1-480-310-7970


Basement Mold

Inspection Techniques

The Canada Mortgage Housing Corporation conducted a survey of 405 houses in Ottawa, Canada, "to determine whether typical 'finished' basements are contributing to poor indoor air quality as a result of mold growth in the finishing materials".

About half of the 405 houses "had signs of moisture in the basement". The study selected 22 for investigation. Molds were found in 18 of the 22 houses, or 82%. Samples were taken from 16 of the 18 houses. In 100% of those houses, "molds with properties that are harmful to humans were found."

The study concluded: "1. Some finished basements do present health hazards to the occupants due to the presence of toxigenic and dangerous molds in the wall cavities; 2. The causes of mold growth in finished basements are directly related to chronic wetting incidents rather than the wall finishing and insulating techniques; and 3. The main chronic moisture sources associated with mold growth in finished basements are exterior moisture sources and wetting mechanisms."

For effective basement mold inspection, use a strong flashlight to check 100% of all wall, floor, and ceiling surfaces for mold growth, cracks in the walls and floors, and water stains and other signs of water intrusion.

Use a professional model moisture meter to scan all walls, floors, and ceilings for elevated levels of moisture, which, if found in one or more locations, is strong evidence that water is coming into the basement through the wall or floor area.

Use a digital hygrometer (about $30 from a hardware or home improvement store) to check the basement humidity.  Check humidity at different times of the day and year-round and log into a humidity journal your findings. If the indoor humidity is 70% or more, the high humidity alone is sufficient to cause basement mold growth.

Is the land around the building sloping away from the building (thus carrying rainfall and snow melt away from the building) or toward the building (thus bringing excess water to the building and causing possible water intrusion into the building's foundation, concrete flood slabs, basement walls, and crawl space area)?

In addition, do
mold testing of the air in all of the basement rooms and areas, and of the outward air flow from heating and cooling duct registers to determine if there are elevated levels of airborne mold spores.

Hire mold consultants Phillip Fry and Divine Montero to find air conditioning mold, workplace mold, and mold hidden inside the walls, ceilings, floors, crawl space, attic, basement, and HVAC equipment and system of your house, condominium, office, workplace, or other building anywhere in  Phoenix, Mesa, and Scottsdale, Arizona, California, Las Vegas, USA, Canada, Hong Kong, Malaysia, Singapore, Thailand, and elsewhere in Asia. Mold Training  Mold Inspector Directory  Industrial Hygienist Training  Industrial Hygienist Directory  Mold Inspection Blog Questions & Answers

Picture of basement mold growth in Ontario, Canada, house.
Basement mold growth caused by a leaking water supply pipe
in a home in Ontario, Canada. Picture taken Nov., 2011.

Picture of basement wall mold growth.
Basement wall mold growth caused by water coming through basement wall.
Picture of basement mold growth.
Basement Cladosorium mold growth.
Mold Experts Recommend Frequent Inspection

and Removal for Mold-Prone Basements

Mesa, Arizona. April 29, 2013.  Mold experts Phillip and Divine Fry recommend quarterly or annual inspection and testing for basement mold growth because basements often have the requirements for toxic mold growth, especially ongoing high humidity and frequent water intrusion.

First, mold easily grows in building areas that are warm, damp, and poorly ventilated such as basements and crawl spaces.

Second, mold-causing basement water intrusion can arise from multiple problems such as dripping water lines and plumbing line leaks; high humidity from the operation of washing machines and dryers (that are not directly vented to the outdoors); burst water supply lines to the washing machine; failed hot water heaters; clogged, failed, or under-sized sump pumps, clogged or frozen sump pump discharge lines, and standing water in the sump pump pit; window leaks; and water condensation caused by the large temperature difference between the outside and the inside of basement wall.

In addition, water intrusion through basement walls and foundations is common because of these four basement building defects: (a) cold joint problems when the slab floor and foundation wall are poured at different times, creating a small crack that can allow moisture to enter;  (b)  foundation cracks in the vertical foundation walls can allow large quantities of water to enter a basement;  (c) cracks in the slab, allowing pressure from the groundwater to force water up through the concrete and into the basement; and (d) the absence or degradation of the an effective water barrier beneath the concrete floor slab, thus allowing water intrusion just like slab cracks discussed above.

Third, any water problem in the basement usually is slow to dry out because the basement gets little or no sunlight, has high humidity (and thus the air cannot absorb more moisture), and gets very little fresh air ventilation.

Fourth, b
asement mold growth can go unnoticed for a long time since people don't spend much time in their often poorly-lighted basements. People use their basement to store many items that are good food for mold growth, such as cardboard boxes to contain stored items. Homeowners do not regularly clean their basements.

Fifth, Mold on basement walls can easily grow and spread into the floors and walls above.  Additionally, air born mold spores from the basement mold can travel through the air to contaminate other areas of your home.  The heating and cooling system, generally located in the basement (where the mold is present) provides an easy pathway to the entire house for airborne mold spores.

For free mold advice on dealing with basement mold problems, email mold consultant Phillip Fry or phone Mr. Fry 1-480-310-7970 and 1-480-217-7173 and visit the Frysí websites and

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Hire mold consultants Phillip Fry and Divine Montero  Fryto find air conditioning mold, workplace mold, and mold hidden inside the walls, ceilings, floors, crawl space, attic, and basement of your house, condominium, office, or other building. Mold Training  Mold Inspector Directory  Industrial Hygienist Training  Industrial Hygienist Directory  Lead Test Kits  Mold Fogging Machine  San Diego Mold Removal  Mold Test Dallas Texas  Mold Inspection Dallas Texas  Houston Toxic Mold Testing  House Mold Testing Texas  Mold Attorney

Pictures and Page Content Copyright 2013, 2014 by Mold Experts Phillip Fry and Divine Montero Fry. All Rights Reserved. You may use our mold pictures and mold inspection advice page content on your website provided that you include a published, prominent, clickable link credit for the pictures and content to Building Mold Inspection.  This website was  last updated on Jan. 7, 2014.