Mold
The most significant problem of an improper Bathroom ventilation is the potential growth of mold in attics. Mold may appear to be several colors but can never be identified with certainty without being tested by a professional lab. Health issues caused by mold are most times related to high concentrations of mold spores in the indoor air. Mold release these spores when they reproduce. Every home has mold in some form or another. Moisture contents of about 20% or more in surfaces will cause mold to propagate. Inhaling spores can cause health issues in those with asthma or allergies, and can cause significant health problems in those with respiratory issues or compromised immune systems. <!–more–>
Most Home Inspectors in New Jersey will refer to mold as a mold like substance or a type of microbial growth. Most New Jersey home inspectors do not test for mold and leave mold testing to professional environmental companies. Home inspections are not mold inspections.
In order to grow, mold requires several conditions to be present in the area.
Oxygen
Temperatures between 45° F and 85° F
Food. (includes a wide variety of materials found in homes)
Moisture
If insufficient levels of any of these requirements exist, all mold growth will stop and fungi will go dormant.
Even though mold growth may take place in the attic, mold spores can be sucked into the other living areas of the home by low air pressure. Low air pressure is usually created by the exhaust of household air from exhaust fans in bathrooms, dryers, kitchens and heating equipment.
Improper Ventilation
Must terminate outdoors. Ducts should never terminate within the home
Termination points should contain a screen or louvered (angled) slats at its termination to prevent bird, rodent and insect entry.
Be as short and straight as possible and avoid turns. Longer ducts allow more time for vapor to condense and also force the exhaust fan to work harder.
Be equipped with a roof termination cap that protects the duct from the elements.
Above all else, a bathroom vent fans should be connected to a duct capable of venting water vapor to the exterior. Mold growth within the bathroom or attic is a clear indication of improper venting that must be corrected in order to avoid structural decay and respiratory health issues.