Types of Mold

Types of mold

There is believed to be an estimated 100,000 different species of mold in existence. Many of these are not only destructive to our homes but also to our health. Here we will cover and focus only on the most common types found in our homes.

Topics Covered

  • Hazard classes
  • Mold types by color
  • Common types of household mold

Hazard classes

Many countries have divided the various species of indoor mold up into three distinct categories – based upon their toxicity levels.

Hazard class A: Species which fall under this category are considered to be highly toxic to humans and need urgent eradication if present in living or work spaces. Two of the most dangerous hazard class A types include stachybotrys chartarum and memnoniella echinata.

Hazard class B: The hazard class B types are known to only cause allergic reactions in people and includes a wide range of symptoms such as red eyes, skin rashes, headaches, runny noses etc. The longer a person is exposed the more intense the symptoms become. And although these species are much less of a risk than those of class A, they should still be urgently eradicated.

Hazard class C: These are completely non-toxic and rarely trigger allergic reactions in people. That doesn’t mean they are harmless though because they still cause structural damage to homes and offices if left unchecked. Therefore, it needs to be urgently dealt with in order to prevent economical damage.

Common types of household mold

What follows is a list of the most common types of mold found in homes. Select any of them for further information.

Types & Species
  • Acremonium
  • Cladosporium
  • Chaetomium
  • Penicillium
  • Trichoderma
  • Aspergillus
  • Fusarium
  • Memnoniella
  • Serratia marcescens
  • Ulocladium

More Information

How to identify mold species by color

Symptoms associated with exposure

How to test for mold

How long does it take for mold to grow