woman looking at black mold on walls holding breath

Many people think that mold only occurs in older homes, but that’s simply not true.

House of any age can develop a mold problem because the source of mold spores is not age-dependent.

While some mold is not harmful to be around, if left untreated, mold can become a hazard within your home.

In this post, we’ll reveal what the most common types of mold in homes occur, how to spot them, and the health impacts of being exposed.

How to Prevent Mold in the First Place

Before we get into the different types of indoor mold, let’s first talk about to prevent it.

Prevention is the key to getting rid of mold for good instead of just covering it up.

The most common household mold types usually develop as a result of water damage or damp surfaces that are not regularly cleaned and dried.

Do your best to fix any leaking pipes, dry out wet areas in the home and to regularly clean carpeting, wooden floors and walls.

If you purchase an old home, make sure there is a thorough check throughout the house for any growing mold problem.

If you are trying to eradicate a mold problem inside a home, a good product to use during clean up is an air purifier.

Some air purifiers use special technology that is excellent at removing the mold spores from the air and preventing them from recontaminating your home.

To learn more about how an air purifier can help in this situation, take a look at our dedicated article on how to choose the best air purifier for mold here.

See all of Amazon's Best Selling Air Purifiers

The Most Common Household Mold Types

Hopefully, you will never encounter a mold problem in your home, but sometimes mold is unavoidable.

Here are some of the more common kinds of mold that can present serious health risks for people if left untreated.


One of the more common molds found indoors and outdoors is alternaria.

Alternaria usually appears in areas that are damp like the sink, shower, or dark and dimly lit areas outside the home.

Health problems associated with alternaria include asthma attacks and allergic reactions.


Another common indoor mold is aspergilus.

This mold incredibly common and does minor damage to those that inhale it.

Severe reactions include respiratory infections, allergic reactions, and inflamed lungs.


The aureobasidium mold is most often found on wooden furniture, surfaces, painted walls and wallpaper as well as around windows and in caulk.

If you notice a spotty substance that is pink and black in color in those areas, it’s probably this type of mold.

Since aureobasidum is so common, most people do develop allergic reactions to it and it has been known to cause more severe reactions than other molds.


Chaetomium mold is found in drywall that has experienced water damage.

People typically identify its presence when they smell a musty or old odor in their home.


Homeowners often find the cladosporium mold inside both cool and warm areas like carpet, wood floorboards, wooden cabinet, and older fabrics.

Being around the cladosporium mold can leave homeowners with breathing problems and respiratory issues.


Fusarium is a mold that tends to grow in colder, wetter areas.

The typical homes for the fusarium mold are carpeted areas and similar fabrics.

Fusarium can cause the standard allergic reaction as well as respiratory infections and inflammation.


Penicillium is a mold that can found indoors inside insulation, furnishings, water damaged furniture, carpeting and more.

Penicillium is known for spreading quickly throughout the home and can cause homeowners to have sinus infections, lung inflammation, as well as allergic reactions.

Stachybotrys Chartarum

Black mold or stachysbotrys chartarum is also called toxic mold.

This is due to the fact that this type of mold creates toxic compounds known as mycotoxins.

The compounds cause those that breathe the mold in to develop breathing issues, sinus infections, depression, fatigue, asthma attacks and more.

This type of mold can be identified by its musty smell and is found in areas that stay damp, like air conditioning pipes and ducts.

Serpula Lacrymans

The serpula lacrymans mold is commonly found outside but can also grow inside on wooden surfaces.

This mold leads to dry rot within wood as it feeds solely on wooden surfaces.

It’s most noticeable by its yellow appearance.


Trichoderma is another damp area mold.

Homeowners often find the trichoderma mold within damp carpeting, wallpaper, and similar surfaces.

The harm with trichoderma comes from the production of mycotoxins that can cause sinus infection, allergic reactions, and more.


The Ulocladium mold is found both outside and inside.

Ulocladium is typically found in areas that have been severely damaged by water like in the floors and walls of homes that have experienced a flood.

This kind of mold causes many homeowners to develop allergic reactions and infections.

Treating Common Molds

Once you identify a mold growing within your home, treating the problem is fairly simple.

A homeowner can typically take care of common indoor molds with the help of household products.

Make sure to protect yourself with a breathing mask and gloves.

Go through the home and search for any wet or damp surfaces or crevices.

It is important to seal off the area where the mold is to prevent the mold from traveling throughout the house.

Moldy surfaces should be washed with a solution containing detergent and warm water.

After the surface dries, use a bleach solution on the surface.

Then, wash and repeat three times. Following the third wash, create a borate detergent solution and scrub the surface.

Once your mold problem is gone, do your best to clean regularly and inspect for any returning mold.

Also, consider investing in one of the best basement air purifiers to keep mold spores out of the air so they don’t multiply as quickly.

Types of Indoor Mold Summary

Types of Indoor Mold Summary

While molds are a natural part of life, they do not need to be a part of your home.

Knowing how to identify different types of mold in homes, treat the problem, and prevent mold from coming back will keep you and your house healthier.

We hope you enjoyed this post on the types of indoor mold in houses and use the information provided here to get relief from any mold issues that may be present in your home.

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About Katherine Dyson

Katherine is the lead Staff Writer. She conducts in-depth research and interviews with industry experts in order to produce a wide range of content for the site. Her main role is to write helpful articles that aid people who are seeking to improve their indoor air quality and comfort. (See Full Bio)