A home contain many things that can be food for mould (wood, paper, cardboard, leather, cotton, wool, silk, etc). Homes are also in the temperature that many moulds like. The only thing missing for mould to begin to grow is – moisture. Once moisture is present, the next most important variable is the temperature. In general, the warmer the more the mould will prosper. A few moulds can begin to grow in 24 hours; by 48 hours many can be growing. After that time gowth is very significant.