Basics
The three essential factors influencing the germination and growth of mold are:
- The presence of mold spores in the air. Spores naturally exist everywhere. If the concentration in the indoor air is relatively high compared to the outdoor air, the presence of a mold source in the space is to be expected.
- The availability of a suitable substrate. Excellent substrates include drywall and cellulose; mold grows poorly on clean glass.
- The moisture on the building surface. There can be various reasons for excessive localized moisture, such as high relative humidity combined with thermal bridges, water damage, inadequate insulation, etc.
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