what is mold?


What is Mold?

Mould or mold is a type of fungi that grows in damp, warm, and humid conditions. It can appear as fuzzy or slimy patches of black, brown, yellow, green, or white on surfaces such as walls, floors, ceilings, and even food items.

How is mold formed?

Mold is formed when airborne spores land on surfaces that are moist and warm and are left to grow and multiply. Its spores are present in the warm and humid air that can enter indoors through ventilation. Once inside, they can settle on surfaces like walls, floors, ceilings, and even household items like furniture or clothing. As its spores settle on damp surfaces, they begin to grow and form colonies. These colonies produce more spores, which can then spread to other areas of the home or building, leading to further its growth. They are generally found in the areas of water damage, such as from leaks or flooding, and can also lead to mold growth in walls, carpets, and insulation.


how is mold formed?

Where does mold come from?

Mold comes from tiny, airborne spores that are present in the environment around us. These spores are naturally occurring and can be found both indoors and outdoors. Its spores are microscopic and can carry by air currents or attached to objects such as clothing, shoes, or pets. When they land on a surface that is moist and warm, they can begin to grow and form colonies. Its growth can exacerbate by poor ventilation, which can trap moisture in a building and create conditions conducive to its growth. This is especially common in buildings that are tightly sealed for energy efficiency. In summary, it comes from naturally occurring spores that are present in the environment, which can settle on surfaces and grow into colonies when conditions are right.


indoor sources of mold

Does mold have negative effects on health?

It’s important to be aware that exposure to it can have negative impacts on your health. There are various symptoms that mean you are exposed to it. some of these symptoms include:

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Allergies triggered by mold cause runny noses, sneezing, nostril irritation

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Breathing problems, coughing, wheezing, etc

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Rashes on the skin and other forms of skin infections

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Nausea, fatigue, and dizziness.

If a person (depending on their existing medical conditions) is exposed to its spores for a longer duration,
they can develop serious health issues. Some of these include:

Hypersensitivity Pneumonitis due to mold

Hypersensitivity Pneumonitis

A rare but serious condition in which the lungs become inflamed and can cause difficulty breathing.

asthma due to mold


Mold exposure can trigger underlying asthma symptoms and can exacerbate already existing asthma conditions.

It is important to take steps to prevent and remediate mold growth to reduce the risk of exposure.

How humidity affects mold growth and
how does it affect your health?

Here’s a table summarizing the levels of it with respect to humidity and their potential health effects:

Humidity Level Mold Level Description Health Effects
30-60% Normal Indoor mold levels that are typical and not a cause for concern. No adverse health effects expected from mold
61-65% Elevated Indoor mold levels that are significantly elevated and require remediation. May cause allergic reactions, and asthma symptoms in sensitive individuals
65-70% High Indoor mold levels that are dangerously high and require immediate action. Can cause severe allergic reactions,asthma attacks, and other respiratory problems, in people with weakened immune systems
> 70% Extreme Indoor mold levels that are dangerously high and require immediate action Can cause serious health problems, including permanent lung damage and even death, in individuals with preexisting health conditions.

It’s important to note that the above table shows general guidelines and the specific levels and health effects can vary depending on the type of mold, the individual’s sensitivity to mold, and other factors such as temperature, ventilation, and duration of exposure. To prevent its growth and related health issues, it’s recommended to maintain indoor humidity levels between 30-60% and promptly address any water damage or moisture issues.

Can mold grow on walls?

Mold can grow on walls when the conditions are favorable for its growth. It needs moisture, warmth, and a source of food to grow, and walls can provide all three of these conditions under the right circumstances. This happens because:


mold grown on wall


If there is excess moisture on the wall, whether from a leak, high humidity, or condensation, it can provide the perfect environment for mold to grow.

Poor ventilation

When there is poor ventilation in a room, moisture can accumulate, leading to mold growth.

Organic material

If there is an organic material on the wall that has been exposed to moisture, it can provide a food source for mold.


It thrives in dark, damp environments, and if the wall is in an area that does not get much light, it can be more prone to mold growth.

How does mold affect my home?

Mold and fungi can damage your house. Its growth can compromise the structural integrity of a building and cause damage to walls, ceilings, floors, and other surfaces. And it can affect your home in several ways:

Weakening of the structure

Mold can weaken the structure of a house by breaking down organic materials such as wood, drywall, and insulation. Over time, this can cause the structure to become unstable and compromise the safety of the building.

weakening of the structure due to mold

Staining and discoloration

It can leave stains and discoloration which can be difficult to remove and may require extensive restoration work.

staining and discoloration due to mold

Unpleasant smell

The presence of it can create an uncomfortable living environment and negatively impact the marketability of a house.

unpleasant smell due to mold

Health issues

Mold that grows within the houses and that comes indoors via ventilation can trigger allergies or asthma for the residents, especially children and old age people.

health issues due to mold

Decrease in property value

If a house has a mold problem, it may decrease the property value and make it difficult to sell.

decrease in property value due to mold

Are mold and Fungi the same?

Mold and fungi are related but not exactly the same thing. Fungi is a broad term that includes a variety of organisms, including mushrooms, yeasts, and molds. While all molds are fungi, not all fungi are molds. For example, yeasts are a type of fungi that typically grow as single-celled organisms and reproduce through cell division. Mushrooms are also a type of fungi, but they grow in specific conditions and are often harvested for food. So, while these are a type of fungi, the term “fungi” encompasses a much broader group of organisms.


Type of fungi includes:


How to prevent mold growth?

ventilation to reduce mold

Improvements Needed

Fixing leaks, improving ventilation, and controlling humidity levels to keep indoor air quality healthy.

dehumidifier to reduce mold

Moisture Control

Addressing any moisture issues in the home or building, improving ventilation, and using air filters or dehumidifiers.

control humidity to redue mold

Controlling Humidity

It’s also important to keep the humidity level in your home below 60 percent and to clean and dry any areas affected by water damage within 24-48 hours.

eliminating moisture to reduce mold

Eliminating Moisture

It needs moisture to grow and thrive, so if you remove the moisture source, it will eventually die.

prevent long term mold

Long-Term Mold Prevention

Some types of it can remain dormant for a long time and reactivate when conditions are favorable again, so it’s important to completely eliminate the moisture source and address any underlying issues that may have caused the its growth in the first place.

mold removal

Mold Removal: Proper Procedures

Simply drying out the affected area may not be enough to eliminate the mold, especially if it has spread to porous materials such as carpet, insulation, or drywall. In these cases, the affected materials may need to be removed and replaced.

How to know if my house has mold?

There are many ways in which we can find out if it is present in a house. These are:

musty smell due to mold


Musty smell

There is a certain musty and unpleasant smell when there is potential mold growth. If your house develops this kind of smell suddenly, it could be a sign of its growth.

visible mold


Look for any visible mold

Any black or green spots on the wall, ceilings, floors, or other surfaces are visible signs of its growth. It may also have a fuzzy or slimy texture.

temperature & humidity level


Humidity & Temperature

Mold grows in humidity over 60% and temperatures between 20°C to 30°C. When these levels are within this range, mold spores can begin to grow and spread.

Timely detection of mold growth is crucial because it not only causes structural damage to the house and produces unpleasant odors, but also poses a risk to the health of those living in the affected environment.