Moisture issue: Foundation is wet; drain gutters are too short. Fix: Drain rain water away from the house, generally about 5 feet away from the foundation. Gutters below grade (below the soil) are protected from damage, while those above grade may be more easily damaged.
Moisture issue: Rainwater is falling and collecting near the foundation of this house. Fix: It is important that the water drain away from the foundation—the ground could be sloped away from the foundation so that the water will run off.
Moisture issue: Disconnected downspout deposits rainwater from roof onto walls and near foundation. Fix: Connect the 2 downspouts.
Moisture Issue: A lawn sprinkler is located near the outside wall of a building; the sprinkler sprays the wall directly, and water leaks through wall into the building. Fix: Move the sprinkler away from the building so that water does not wet the walls or collect near the foundation.
Moisture Issue: Foundation was chronically wet, water and mold damage was found on original structure. Fix: Area was regraded during construction of an addition so that water drains away from the foundation.
An example of window flashing, applied so that water drains to the outside of the window and not into the surrounding frame or walls.
Rust is an indication that condensation occurs on this drainpipe. The pipe should be insulated to prevent condensation.
Moisture issue: Condensation on uninsulated air conditioning duct. Fix: Insulate the duct on the outside.
Moisture issue: Leaking pipes. The leaking pipes under the kitchen sink were taped; the pipes continued to leak, and the area got moldy. Fix: The pipes should be fixed by a plumber or other qualified professional.
Example of a crawlspace without mold or water problems. The site is well drained. The crawlspace has a vapor barrier over the earth, is air-sealed, and insulated on the walls.
Two examples of dehumidifiers. For spaces that are damp, often at high humidity, but do not have liquid water running through them, a dehumidifier can be used to reduce humidity.
Example of a drain pan beneath a cooling coil that slopes to a drain line and is constructed of stainless steel.
Example of exhaust vent in a bathroom.
Example of an exhaust hood and fan over a stovetop in a kitchen. An exhaust fan over a range draws heat, moisture, and contaminants out of the house. Range hoods should vent to the outside.
Mold (and dirt) beneath refrigerator due to chronic drip-pan overflows.
Mold on a vacuum cleaner stored in a damp basement.
Moisture meter and moldy roof sheathing.
Measuring moisture levels of a subfloor.
Moldy bedroom closet. Water condensed from the air onto the gypsum board. The wall is cool enough for condensation because there is a hole in the insulation and it is cold outdoors.
Moisture meter, showing high moisture content in gypsum board behind tile.
Mold growth under ceramic tiles in a bathroom.
Mushrooms growing at the base of and behind the baseboard below a water leak in a bathroom. The baseboard has been removed; the puckers in the paint are due to water damage.
Most mold is found by simply looking. Mold beneath corkboard.
Mold inside a wall. This photo shows an interior wall with the lower portion of the drywall removed on one side; there is mold on the backside of the drywall caused by water leak.
Opening a wall with a utility knife to minimize disturbance to mold in the wall cavity.
Inside of wall from above, moldy gypsum board, insulation.
Looking for mold in wall cavities by removing a section of drywall.
Clear plastic tape is used to collect a sample. The sample is analyzed with a microscope to determine whether the substance is mold or soot.
Bulk samples can be examined using reflective light microscopes, such as stereo microscopes or this epi microscope.
N-95 disposable respirator.
Cleaning with Personal Protective Equipment (PPE) - gloves, goggles, N-95 respirator.
Limited PPE.
Full containment on a large job.
Full containment.
Full containment.
Drying a carpet with a commercial specialty blower with built-in heater.
HEPA vacuum. Care is being taken to disturb the mold as little as possible while vacuuming.
Damp wiping surfaces with water and a small amount of detergent. 
Bookcases and books protected during clean-up.