For pregnant mold growth to occur, there must be a source of water (which could be invisible humidity), a source of food, and a substrate able of sustaining growth. Homely building regulations materials, such as plywood, drywall, furring strips, carpets, and carpet padding are eatable for molds. In carpet, invisible dust and cellulose are the food sources (see also ashes mites).

The necessary goals of any mold investigation are always twofold: Mold Inspection Palm Beach 1) find the locations of mold growth, and 2) determine the sources of the moisture. If these can be answered by simpler or further cost-effective methods, mold testing is probably not a cogitative custom of resources.