Condensation occurs when a surface is cooler than the dew point temperature of the air next to the surface. At this temperature, the air becomes saturated with water. This is equivalent to 100% relative humidity. When condensation occurs, mold and decay are very likely. Mold can grow when the air is damper than about 80% relative humidity. To help locate potential problem spots , use the following calculator to determine temperatures where condensation, decay and mold may occur on surfaces exposed to outside summer air.

Use the following chart to find the temperature at which Condensation and Decay may occur on surfaces or when Mold and Mildew may grow on surfaces.