Mold/Microbial problems usually stem from water infiltration/high humidity. Mold growths usually begin to develop with 24-48 hours if the water source is causing moisture to accumulate on a food source for mold. The most common food source for microbial growths would be any cellulose based material.
If the water saturation is continuous then hydrophilic fungi can develop. This group of fungi contain some of the most toxic species of fungi such as Stachybotrys Chartum.
Mesophilic and Xerophilic fungi can develop in areas where there is high humidity (60% or greater) for an extended period of time. These fungi are the more common types of fungi such as Cladosporium, Aspergillus and Penicillium. These fungi tend to give off less Mycotoxins then the hydrophilic fungi.
The most common causes of water infiltration that can cause mold/microbial growths are roof leaks, high humidity in attic and basements, foundation leaks into basements, broken or leaking water lines, humidifiers on HVAC systems, ground water infiltration and broken or improperly installed sump pumps.
HM Environmental
Provides readily available equipment including, moisture meters, thermal hygrometer (for temperature and relative humidity readings), pumps non-viable sampling (high flows). In addition, HM Environmental maintains a supply of all sampling media (swabs, tape lifts, Air-o-cells, etc) necessary to complete any sampling requirement that may arise. All samples are analyzed by a third party independent laboratory certified by the American Industrial Hygiene Association (AIHA).
During the inspection, Temperature and Relative Himidity readings may be taken in the areasunder evaluation by utilizing a thermohygrometer to assist comfort conditions. Temperature and Relative Humidity readings may also be taken on the exterior of the building for comparative study.
The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) Standard 55, “Thermal Environmental Conditions for Human Occupancy” recommends a temperature between 68̊F and 75.5̊F with a relative humidity between 30% and 60% for interior comfort. It also recommends a relative humidity below 50% in order to deter microbial growth.
A moisture meter may be used during the investigation to help pin point areas of hidden elevated areas of moisture in walls, ceilings, etc. that may have an impact on microbial growths and that may not be visible during the inspection.
