Carpet at Risk
Carpeting is an area of the home that can be at high risk for mold growth.  In order to grow, mold needs moisture, oxygen, a food source, and a surface to grow on.  Mold spores are commonly found naturally in the air.  If spores land on a wet or damp spot indoors that contains dust for them to feed on, mold growth will soon follow. Wall-to-wall carpeting, as well as area rugs, can provide an ample breeding ground for mold if conditions are right.  At especially high risk for mold growth are carpeting located below ground level in basements, carpet in commonly moist or damp climates, and carpet that has been wet for any period of time. 

Identifying Mold in Carpeting
Just because mold is not immediately apparent or visible on a carpet's surface does not mean that mold growth is not in progress.  In fact, mold will probably only be visible on the surface of carpets in unusually severe cases of growth, such as carpet damaged in flooding that has remained wet for some time. InsideOut Inspections can detect specific types of mold spores by using state of the art equipment to pull air samples from your home.  The following are some examples of identifiable instances where mold growth has occurred or is likely to occur:

• visible mold growth:  As stated above, this can be a rare case, but sometimes it may be obvious from visual inspection that mold growth is occurring.  Carpet in this condition is most likely not salvageable and should be disposed of and replaced.  Often, even if mold growth is not visible on the top of carpeting, it may be occurring underneath the carpet where it can't be easily seen.  Carpet suspected of containing mold should always be examined on both sides.
  
  
• carpet mildew:  Any discoloration or odor on carpeting that might be described as mildew is probably a case of mold.
  
  
• wet or water-damaged carpet:  Any carpet that has been subjected to water damage from flooding or standing water will most likely need to be disposed of.  Conditions are ripe for mold growth, in this case.  Even if visibly apparent mold growth has not yet begun, it is highly likely to happen unless the carpet is completely removed, cleaned and dried within 24 to 48 hours.  Even then, removal and cleaning are not guaranteed to prevent mold growth.  It is more likely that the carpet will need to be replaced.
  
  
• wet padding beneath carpet:  If padding beneath the carpet has become wet for any reason, or has become moist from condensation, the padding as well as the carpet on top are at risk for mold growth.  The padding may need to be replaced, as will the carpet, in some cases.
  
  
• basement carpet:  Carpeting in basements below grade level is especially at risk in areas where humidity is high, or where wide temperature swings can produce condensation.
  
  
• odors and stains:  There is a wide range of things that can cause odors and stains on carpets.  If mold is suspected, samples can be taken and sent for analysis to determine if mold growth has occurred.

Preventing Mold Growth in Carpeting
The best method for combating mold is to not allow mold growth in the first place.  The best way to do so is by ensuring that conditions conducive to growth do not exist.  Below are some ways to prevent mold growth in carpets.

• Reduce indoor humidity.  The use of dehumidifiers will help control moisture in the air, depriving mold spores of the water they need to grow into mold.  A range of 30% to 60% humidity is acceptable for interiors.
  
  
• Install intelligently.  Do not install carpeting in areas that are likely to be subject to frequent, high moisture.  Carpet in a bathroom, for example, will quickly turn to a breeding ground for mold growth due to the high humidity from constant water use in that area.
  
  
• Choose high-quality carpet padding.  Solid, rubber-slab carpet padding with anti-microbial properties is available.  It is slightly more expensive than other types of padding but can be helpful for preventing the growth of mold, especially in climates prone to periods of high humidity.
  
  
• Never allow standing water.  Carpet exposed to standing water will quickly be ruined.  If standing water ever occurs because of a leak or a spill, all carpeting exposed must be immediately cleaned and dried.  The top and bottom surfaces of the carpet, any padding, and the floor underneath must be cleaned and completely dried within a short period of time after exposure to standing water if the carpet is to be saved.  If a large flood has occurred, or if standing water has been present for any extended period of time, the carpet will probably need to be replaced.
  
  
• Clean smart.  When carpeting needs to be cleaned, try to use a dry form of cleaning, when possible.  If any water, liquid, or other moisture has come in contact with the carpet during cleaning, be sure it is dried thoroughly afterward.
  
  

Removing Mold From Carpet

Disadvantages of Carpets in Bathrooms
 
The pad beneath the carpet may soak up large amounts of moisture.  Some of the common ways that carpets may come into contact with moisture in bathrooms include:

• Steam from the shower will condense on the carpet.
• Water splashes from the tub or shower.
• Water sheds from shower/tub occupants as they step onto the carpet.
• Water splashes out of the sink.
• Water drips from the vanity.
• Water leaks from the toilet.

The presence of moisture in the pad will lead to the growth of decay fungi on the wood or oriented strand board (OSB) sub-floor. The sub-floor will be decayed and weakened by mold. Mold also releases spores that can cause respiratory ailments, especially for those with certain health problems. Inspectors can use moisture meters to determine if there is excess moisture beneath a carpet.
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 In addition to potential mold growth beneath the carpet, bacteria can accumulate in carpeting that surrounds the toilet. Bacteria are contained in urine, which can be accidentally deflected onto the carpet.
 
The following are recommendations that InterNACHI inspectors can pass on to clients who are experiencing urine- or moisture-related problems with their bathroom carpet:

• Clean the carpet regularly to remove any mold or urine that may be present.
• Keep the carpet as dry as possible. Various devices exist that prevent water from bypassing the shower curtain.
• Install a bathroom fan, if one is not installed already. If a fan is installed, operate it more often.
• Inspectors can inform their clients about why they are experiencing problems.

In summary, carpets installed in bathrooms can trap moisture and urine, substances that can cause structural damage and health problems.

Bathroom ventilation systems are designed to exhaust odors and moist air to the home's exterior. Typical systems consist of a ceiling fan unit connected to a duct that terminates at the roof.
 
Fan Function  
 
 The fan may be controlled in one of several ways:

• Most are controlled by a conventional wall switch.
• A timer switch may be mounted on the wall.
• A wall-mounted humidistat can be pre-set to turn the fan on and off based on different levels of relative humidity.

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• and also force the exhaust fan to work harder;
• be insulated, especially in cooler climates. Cold ducts encourage condensation;
• protrude at least several inches from the roof;
• be equipped with a roof termination cap that protects the duct from the elements; and 
• be installed according to the manufacturer's recommendations.

The following tips are helpful, although not required. Ventilation ducts should:

• be made from inflexible metal, PVC, or other rigid material. Unlike dryer exhaust vents, they should not droop; and 
• have smooth interiors. Ridges will encourage vapor to condense, allowing water to back-flow into the exhaust fan or leak through joints onto vulnerable surfaces.

Above all else, a bathroom ventilation fan should be connected to a duct capable of venting water vapor and odors into the outdoors. Mold growth within the bathroom or attic is a clear indication of improper ventilation that must be corrected in order to avoid structural decay and respiratory health issues.

I recommend getting a home inspection with your real estate purchase.A solid home inspection can save you from costly home repairs and unseen problems.You cannot get your home inspection payment back after ordering an inspection but, is it better to pay for an inspection or find out after you buy the property that you need a new $10,000 roof or septic system?It is helpful to know the structural integrity of the property your buying and little things you might need to repair that you never thought of.Hows the roof?What type of plumbing system do I have?Any signs of water intrusion?How much is it gonna cost me?The home inspector will go over everything he finds in person with you at the property if you like and also he will give you a detailed written report so you have it in writing.Its up to you as the home buyer ultimately.If you don't get one it can cost you in the long run