How long does it take for black mold to grow on drywall?

Author: Maximillia Nader II  |  Last update: Friday, May 30, 2025

Black mold begins to form and multiply within 12–24 hours when the conditions are right. If you've experienced water damage, be sure to take action immediately to dry and dehumidify the area to prevent spores from taking hold.

How quickly does mold grow in drywall?

mildew and mold will develop within 24-48 hours of water exposure. Even worse, it will continue to grow until steps are taken to eliminate the source of moisture, and effectively deal with the mold problem. Use the diagram on the facing page to assess the extent of mold in your home.

How quickly can black mold appear?

As aforementioned, mold can begin to grow as soon as 24 hours after water damage has occurred, so it's best to act immediately. You will first need to extract any excess water, which can be done with a wet vacuum. Then you will need to thoroughly dry out your property.

Does drywall with black mold need to be replaced?

Many homeowners attempt to simply repair drywall that is infested with mold, but it should always be fully replaced. If you don't replace every part of your drywall that has experienced mold growth, you're only leaving your home vulnerable to much more damage in the future.

How do you know if black mold is behind drywall?

Some of the signs of black mold in your house may be a musty smell, dark-colored tile grout, and warped drywall.

Mold on Drywall - Should You Be CONCERNED?

Can mold behind drywall make you sick?

Can Mold Inside Walls Make You Sick or Does It Need to Be Exposed? Yes. Even if you can't see it, mold can make you sick. Spores can spread throughout your home, even from relatively contained areas like inside the wall.

What does harmless black mold look like?

Although the name implies a uniform coloring, black mold may appear black, dark green, or dark brown. It typically grows as a cluster of round spots with a distinctly wet, slimy appearance. As stated, black mold typically appears fuzzy or furry.

Should you cut out drywall with mold?

Mold on drywall can indicate a deeper problem in the stud space behind your wall since it can penetrate the surface. In this case, you'll need to cut it out and replace the drywall in the affected and surrounding areas.

Does homeowners insurance cover mold?

Homeowners insurance doesn't usually cover mold damage or removal unless it's the result of a covered peril. If the mold in your residence was caused by something sudden or accidental, such as a bursting pipe or some other covered incident on your policy, you may be protected.

Can you wipe black mold off a wall?

Cleaning mold off walls naturally can be achieved using household ingredients such as vinegar, hydrogen peroxide, or baking soda. Create a solution by mixing equal parts vinegar and water or hydrogen peroxide and water. Alternatively, make a paste using baking soda and water.

What does early stages of black mold look like?

Visual Signs

At times, homeowners may observe black mold appearing as dark rings or spots on walls and ceilings. If you notice such marks suggesting water damage or pooled water, these could signal the initial stages of a mold infestation.

Is it safe to clean black mold yourself?

Thus, exposure to the toxicity of black mold can cause harm to our physical health. Cleaning it yourself risks a greatly increased chance of acquiring damaging health conditions by unsettling the toxins into the air. Depending on the frequency of mold exposure, an individual's health can be severely compromised.

What can be mistaken for black mold?

Aureobasidium

This yeast-type fungus can be mistaken for another more sinister and dangerous mold but is far less likely to make you sick. Aureobasidium can start as a slimy pink color, but it will turn brown or black and can look like black mold.

How long does it take for black mold to make you sick?

If you're allergic to black mold, you may have symptoms immediately after spores come in contact with your body. If you're not allergic to black mold, you may not have any symptoms, or your symptoms may not appear for a long time.

Will drywall mold if it gets wet once?

So, Does wet drywall always mold? Well, Once drywall comes in contact with water, there is only a tiny timeframe available to salvage it before the mold or mildew begins to set in the wall. Some mold spores can germinate after just 12 hours of drywall being in wet conditions.

How to tell if mold is behind the shower wall?

Visual signs of mold attacks on the bathroom wall include discoloration, peeling wallpaper and crumbling plaster. Mold often grows behind wall tiles, causing these materials to crack or become loose. Plus, gaps in the grout or caulk suggest mold spores have infiltrated the spaces behind the wall.

How much is black mold removal?

The black mold removal cost of an unfinished basement can really vary. It could be as little as $500 or as high as $4,000 depending on the scope and size - AKA how much mold is present and how much area it covers. If the attic and ducts are involved, the cost for those generally ranges from $2,000 to $6,000.

How do I permanently get rid of mold in my house?

Spray the area with a mixture of water and vinegar - half water, half vinegar. Next, scrub to remove all traces of the mold. For removal of black and white mold, spray the area with the half water and half vinegar solution.

Who pays for mold remediation?

If there is a covered condition that the homeowner's insurance policy covers that causes mold, then the insurance company will cover mold remediation. Excess water from a natural cause like a roof leaking after a rain storm is usually covered by a homeowners insurance policy.

Can you get rid of mold without tearing down walls?

Unfortunately, it is often necessary to tear out drywall to do effective mold removal from inside a wall. Once all the cleanup and treatment of the interior surfaces is completed, you will need to rebuild the area. Put in new insulation and install new drywall.

Which side of drywall is mold resistant?

Always hang PURPLE drywall with the purple side out, or facing into the room.

Is a little black mold okay?

On the basis of current research, black mold exposure is no more dangerous than any other type of mold exposure. It is impossible to avoid exposure to mold — the spores are almost everywhere in the atmosphere. In high amounts or in people with allergies, exposure to any mold may cause allergy symptoms.

How fast does mold grow in walls?

Mold can easily grow within 24 to 48 hours and will begin to colonize in 1 to 12 days. Most times, mold is already a problem before it is discovered. Due to the fact that the spores are hard to destroy, mold will sometimes return even after the mold source is gone.

Does black mold just wipe off?

If you try to clean it with a heavy-duty cleaner, you might find that it remains on the surface and doesn't completely wipe away. What are the health effects of toxic black mold? Contact with toxic black mold can increase the likelihood of developing asthma, and contribute to more severe, long-lasting chronic symptoms.

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