MOLD RESEARCH
How to Limit Mold Growth
From the NAHB Research Center

The most practical approach to limit mold growth is early detection and prompt resolution of excessive moisture. If a homeowner can see mold or detect an earthy or musty odor, it can be assumed that there is a moisture problem that must be resolved. Mold growth is found behind walls or under materials where water has damaged surfaces. Homeowners also should look for discoloration and mold on surfaces.

Controlling indoor moisture will limit the probability of supporting mold growth from condensing water on interior surfaces, such as walls, windows and areas near the air conditioning supply registers. Relative humidity meters, which measure the amount of water vapor in the air, also are useful for detecting excessive moisture. Moisture sources that increase indoor air relative humidity include bathing, cooking, plants, washing and air-drying of dishes and clothes, unvented combustion appliances, humidifiers and outdoor ventilation air in humid climates.

Other moisture sources include water from leaks, including pipes, rainwater leakage through windows, roof flashing and ice dams.