You come across a mold infestation in your home. You’re not sure about what to do next, so you go online to look for some information. But the terms and jargon only confuse you. Here’s where a mold glossary comes in handy.

Whether you’re a homeowner or a renter, knowing the various mold terminology is always a good idea. 

What is a Mold Glossary?

A mold glossary is a collection of words, phrases, and terms commonly associated with mold growth inside homes. Many homeowners and renters aren’t aware of these words, or they may misunderstand them. This could lead to a lot of confusion, misinformed decisions, and delayed action. 

A mold glossary helps you avoid these problems. 

Mold terminology may seem overwhelming at first. But once you get to know these mold and home inspection terms, you’ll be in a better position to understand and deal with infestations. 

15+ Mold Terms You Should Know

Here are some terms that are commonly associated with mold infestations.

1. Indoor Mold

Indoor mold is fungal growth that develops when mold spores land on damp surfaces inside your home. The CDC says that the most common indoor mold types are Penicillium, Cladosporium, and Aspergillus. 

Check out the possible health effects of these indoor mold types: 

2. Spore Count

The spore count is a term in air quality vocabulary that tells you the number of mold spores within a specific area. It is important because it gives you an idea of how extensive the mold infestation in your home is. 

Molds can release tens of thousands of spores into the air each day. That’s how they grow in size and spread to other surfaces. If you have a higher-than-normal spore count, it usually means you have an active mold problem that needs immediate attention.

According to a study published on MedCrave, a spore count of more than 1,000 per cubic meter of air indicates an active mold infestation that could lead to various health issues. 

3. Mycotoxins

Mycotoxins are highly toxic compounds that some types of molds produce. They’re typically invisible and don’t carry any smell. What makes them dangerous is that if you inhale them, they may cause serious health issues like: 

• Brain fog
• Fatigue
• Fever
• Headache
• Respiratory distress
• Nausea 
• Vomiting
• Cancer 
• Immune suppression 

4. Relative Humidity

Mold loves humidity. That’s why one of the first things mold professionals do during an inspection is test for relative humidity. It measures how much moisture is in your air and compares it to how much it can hold. 

If there’s too much humidity in the air, chances are that you may have mold in your home. And the greater the moisture, the faster mold can grow. That’s why it’s important to maintain optimal levels of humidity indoors. 

According to the EPA, relative humidity indoors should ideally be between 30% and 50%.

5. Air Sampling

Air sampling is one of the home inspection terms mold professionals commonly use. It is a method used to test for invisible mold spores and other indoor contaminants in the air. Professionals use a vacuum pump to pull air into a collection device. The collected air is then sent to a lab for analysis, which shows you:

• If there’s mold in the air
• The type of mold
• How much of it is present

6. Surface Sampling

Surface sampling tells you whether mold is actually present on surfaces in your home. If there is mold, this method can identify the species, too. Depending on the type of surface, experts may use a variety of tools to take a mold sample, like:  

• Cotton swabs
• Wipes
• Sponges
• Contact plates

Surface sampling is useful when you can spot visible mold on your walls or floors, and you want to confirm if it is actually mold, or just dirt or stains. The sample is then sealed and sent to a lab for analysis. 

Lab technicians thoroughly examine it under a microscope and run several tests to: 

• Confirm whether mold is actually present
• Identify the specific type of mold that is growing
• Determine the level of infestation

7. Bulk Sampling

Bulk sampling is another method used to identify the type of mold and the level of growth. It is more useful than surface sampling if you need to know if the mold infestation has penetrated a surface or material in your house. 

Here, professionals carefully cut out a piece of the infested surface. This surface can be anything like:

• Carpets
• Insulation materials
• Drywall
• Wallpaper
• Fabric
• Ceiling tiles
  

8. Volatile Organic Compounds (VOCs)

Volatile organic compounds (VOCs) are chemicals that easily evaporate into the air at room temperature. 

We’ve included this term in our mold glossary because mold produces VOCs as a byproduct. The musty and earthy smell that you get from mold? It is because of the volatile organic compounds that it releases. 

The smell itself is usually the first sign that you may have a mold problem at home. 

VOCs are also released by other products like furniture, cleaning products, paints, and even some fabrics. In addition to mold and VOCs, other contaminants like radon, carbon monoxide, and particulate matter also affect your indoor air quality.

To really find the truth about your IAQ, get in touch with us at InHaus Lab.

We’ve tested over $100 million worth of homes across the country, and we’ve detected hidden pollutants in around 80% of them. With science-backed methods, we’ll help you see what your IAQ is like, so you can take the necessary measures promptly. 

9. Sick Building Syndrome (SBS) 

If you get sick when you’re inside your home, but find no apparent cause, you may be suffering from Sick Building Syndrome (SBS). The symptoms of SBS include: 

• Headaches

• Throat or eye irritation

• Fatigue

• Dizziness

• Nausea

How is this related to mold? You see, when mold grows in your home, it releases spores and VOCs into the air. These chemicals can trigger inflammation in your body when you inhale them. That’s why the symptoms of SBS only appear or worsen when you’re inside your home, and not when you are outdoors.        

The good news is that ventilation can help. 

When you have adequate airflow and circulation, these chemicals do not build up indoors. Conversely, if your home has poor ventilation and if your indoor air is compromised, you could suffer from SBS. 

As the IAQ-SFRB reports, nine studies showed that 80% of occupants report SBS symptoms in buildings that have poor ventilation. 

In case you suspect you may be suffering from SBS, poor IAQ may be the culprit. InHaus Lab can assess your home’s air quality, especially if you live in Aspen, Minneapolis, or nearby.

10. Dry Rot

One of the worst things that can happen to wood is dry rot. It is a type of decay that’s caused when mold eats away at the wood fibres. This leaves the wood brittle and crumbly. 

The key thing you should know is that for dry rot to set in, there needs to be moisture or water seepage. But once it sets in, it can quickly travel far and cause severe structural damage to your home.    

11. Fungicides

Fungicides are strong chemicals used to kill mold and prevent it from recurring. When you apply a fungicide on an infested surface, the chemical breaks down the mold and kills its spores. This prevents it from growing. 

12. HEPA Filtration

HEPA (High-Efficiency Particulate Air) filtration is another important home inspection term. It is the process used to capture and remove mold spores and other airborne contaminants from your indoor air. 

HEPA filters use this process to keep your indoor air quality (IAQ) high. You’ll find these filters in various appliances like portable air purifiers, vacuum cleaners, and even central or other HVAC systems. 

Without HEPA filtration, the spores released by mold remain indoors and circulate through the air. When you breathe in these spores, you could suffer from symptoms like:

• Asthma
• Allergies
• Respiratory distress
• Hypersensitivity pneumonitis 

13. Moisture Mapping

Moisture mapping measures moisture content at various points in the affected area. To assess the level of moisture in your home, professionals use a combination of tools like:

• Moisture meters
• Infrared cameras 
• Thermo-hygrometers

The readings from these tools are then used to create a visual map showing exactly where water has penetrated the surface. With moisture mapping, you can find out hidden water damage that you might have otherwise missed.

14. Dehumidification 

Dehumidification is the process of reducing the level of moisture in the air. You may be aware that high humidity is what causes mold to grow. By lowering the level of moisture in the air, you can prevent mold from growing indoors. To do this, you can simply purchase a dehumidifier and let it run in the room for a while.

That said, if mold has already infested your home, dehumidification may not be of much help.  

15. Mold Remediation

Mold remediation is the professional term for the process of removing mold. Experts use this word in mold terminology when they’re discussing plans to treat an infestation. 

It can be quite extensive because it doesn’t stop with getting rid of the mold alone. It also usually addresses the root causes that allowed mold to grow in the first place.

Remediation includes various steps like: 

• Isolating the mold-infested area 
• Cleaning surfaces to remove contamination
• Removing extensively damaged materials 
• Preventing mold recurrence

If you want to find out more about the process, you’ll find this remediation technician’s ‘Ask Me Anything’ post on Reddit interesting.  

16. Post Remediation Verification

Post Remediation Verification, or PRV, is a test that’s done after the mold remediation process. It confirms if the mold has been removed and checks if your home is safe once again. 

The process involves:

• Thorough visual inspection of the space
• Air sampling 
• Surface testing 
• Moisture testing 

Take the First Step to Better IAQ with Professional Mold Testing 

Now that you know the important mold and home inspection terms, you can understand what professional mold testing means and why your home needs it. If you see any visible mold growth, smell dampness in the air, or suffer from unexplained symptoms, you’ll need to get your IAQ tested. 

Schedule an appointment with InHaus Lab, and we’ll help you uncover the truth about your home’s mold infestation and IAQ. 

Mold Glossary FAQs

1. Why do I need to understand mold terminology before hiring a contractor in 2026?

Learning basic mold terminology and home inspection terms gives you the upper hand in conversations. Contractors can’t confuse you with jargon, and you’ll be able to identify whether they’re offering real solutions or unnecessary extras. 

2. What is the difference between mold remediation and mold removal?

Mold remediation goes after the root cause, so mold doesn’t keep popping up. Mold removal, however, just focuses on removing what’s already there without preventing future growth. 

3. What are mycotoxins, and should I be worried about them? 

Mycotoxins are harmful substances that some molds release. While they’re a legitimate concern, most household molds usually don’t produce dangerous levels. 

4. What is the difference between mold and mildew?

Mildew grows as thin layers on surfaces and comes off fairly easily. Mold penetrates deeper into materials and is harder to eliminate completely. 

 5. How can knowing mold terms help me save money on remediation?

When you’re aware of mold terminology, you can distinguish between essential services and add-ons that bump up your bill. It’ll help you make smarter financial decisions. 

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References:

• CDC, “Mold”
• EPA, “Mold Course Chapter 2”
• IAQ-SFRB 
• Reddit 
• MedCrave