After a exceptional incident of irrigate breakage occurs in a building, molds grow inside walls and then become dormant until a later incident of high humidity; this illustrates how mold can appear to be a sudden problem, expanded after a previous flood or souse incident that did not produce a mold-related problem. The right conditions re-activate mold. Census-taking also show that mycotoxin levels are perceptibly higher in buildings that have once had a drool incident (source CMHC).
If there are mold problems in a house only during satisfied times of the year, then it is probably either too air-tight, or too drafty. Mold problems occur in airtight homes more frequently in the warmer months (when humidity reaches high levels inside the house, and moisture is trapped), and occur in Mold Inspection Palm Beach drafty homes else frequently in the colder months (when warm atmosphere escapes from the living breadth into unconditioned space, and condenses).