House mold is a common concern for homeowners, as it can cause health problems and damage your home. There are 12 common types of mold found in houses, classified into three categories: allergenic, pathogenic, and toxic. Mold thrives in damp, dark House mold is a common concern for homeowners, as it can cause health problems and damage your home. There are 12 common types of mold found in houses, classified into three categories: allergenic, pathogenic, and toxic. Mold thrives in damp, dark en