Some moulds can begin to grow as soon as 24 hours. Temperature is a major variable: the warmer, the more quickly moulds will begin to grow. Within a few days there can be hundreds of varieties of moulds flourshing inside you home. Whenever you have any water loss it is recommended you call the Professionals at PuroClean to help you assess the full extent of the damage and to provide professional and professional assistance in remediation, sanitization and drying.