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Can Insulation Get Wet?

worker removing wet insulation

What happens when insulation gets wet? Can it ruin the insulation? Will the insulation hold up if it gets wet? Can you dry out the insulation if it does get wet? These are all valid questions that many homeowners have about insulation. We will answer all those questions, including what type of insulation can withstand moisture and how to handle it if it builds up. Homeowners should know about the dangers of mold buildup with wet insulation. Keep reading to learn more!

What Happens if Insulation Gets Wet?

Most types of insulation are designed to resist moisture, but if your insulation is wet and it’s not properly taken care of, it can wreak havoc on your home. Wet insulation loses its ability to insulate, leading to heat loss, air leakage, poor indoor air quality, and higher energy bills.


Wet insulation also provides an ideal environment for mold and mildew growth. If mold or mildew is present, it can cause respiratory and other health issues. Mold and mildew can also destroy the integrity of your home’s structure.


Wet insulation can lead to an invitation of pests such as rodents and insects. No homeowner wants their family to live in an unhealthy environment or a pest-infested home. It’s essential to prevent wet insulation and address any issues that stem from it as soon as possible.


The issues that arise ultimately come down to the type of insulation material you have.

What if Fiberglass Insulation is Wet?

Wet fiberglass insulation will eventually lose some of its insulating properties. The wet, thin glass fibers will cause the material to expand, making it less effective at trapping heat. Moisture can cause the fibers to break down, making the insulation less durable. If you notice water damage on your walls or ceiling, it’s essential to inspect it immediately.


You may need to remove your drywall and let your fiberglass insulation dry before repairing the wall or ceiling. If fiberglass insulation is frequently exposed to moisture, it may need to be replaced more often than other types of insulation. However, fiberglass insulation is still among the most effective and widely used insulation materials. When installed correctly, it can help to reduce energy costs and keep homes comfortable year-round.

What if Cellulose Insulation is Wet?

Cellulose loose-fill insulation is a common material used for attic insulation. When cellulose insulation gets wet, it loses its effectiveness.  Cellulose can absorb water, and the water weight makes it difficult for the material to provide the necessary insulation.


The combination of moisture and warm air can lead to the growth of mold and mildew. In some cases, wet cellulose insulation may also start to rot, which can cause structural damage to your home. If you notice that your cellulose insulation is starting to get wet, it’s important to take action immediately. Dry out the area as much as possible and consider replacing the insulation if it appears damaged. These steps will help ensure that your home stays warm and dry.

What if Spray Foam Insulation is Wet?

The good news is that spray foam insulation is pretty resistant to water and creates a moisture barrier between the foam and your walls. It won’t absorb much moisture, and it won’t promote the growth of mold or mildew.


However, you should keep a few things in mind if your spray foam insulation gets wet. First, make sure that you dry it out as soon as possible. If water is allowed to sit on the surface of the foam, it can cause the material to degrade over time. Second, be aware that wet spray foam insulation is heavier than dry foam, so take care not to damage the structure of your home when removing it.

Is There Insulation That Can Get Wet?

For most people, the word insulation conjures up images of thick fiberglass batting, loose-fill cellulose, or rigid foam panels. But there is another type of insulation that is often used in wet or humid conditions: spray foam insulation.


Spray foam insulation is made from two main ingredients: a blowing agent and a polymer. The blowing agent expands the foam, while the polymer helps to bind the cells together. Once applied, spray foam quickly hardens into place, creating an airtight seal that can help to prevent moisture and condensation buildup. Because it cures into a solid material, spray foam insulation can also help to deaden sound and reduce vibrations. It is ideal for use in bathrooms, laundry rooms, and other damp spaces.

Can Insulation Get Moldy if Wet?

Yes, insulation can develop mold if it becomes wet. Mold is a type of fungi that grows in moist conditions. When mold spores land on a wet surface, they can start to grow and spread. If left unchecked, mold can cause extensive damage to the insulation material. In some cases, it can also lead to health and respiratory problems for people who are exposed to it.


That’s why it’s important to take steps to prevent wet or damp insulation from developing mold in the first place. One way to do this is to keep the area around the insulation dry and well-ventilated. If you suspect your insulation has already developed mold, you should call a professional to help with removal and cleanup.

How to Dry Wet Insulation in Walls

When wet insulation is discovered in walls, the first step is to assess the extent of the damage. If only a small area is affected, removing and replacing the affected insulation may be possible. However, if the entire wall is wet, it is usually best to remove all of the insulation and start over.


The next step is to identify the source of the water leak and repair it. Once the leak has been fixed, the wall cavity should be thoroughly dried before new insulation is installed. In some cases, a dehumidifier or fan may be necessary to speed up the drying process.


Once the wall cavity is completely dry, new insulation can be installed using several methods. The most important thing is to make sure that the new insulation has an air-tight seal so that no moisture can enter the wall cavity in the future.

How Much Does it Cost to Replace Damaged or Wet Insulation?

The cost of replacing damaged or wet insulation will depend on the type and extent of the damage, including the size and location of the area that needs to be repaired. If the damage is limited to a small section of the drywall, the repair may only require a few sheets of new drywall and some joint compound. However, the repair will be more costly if the damage is more extensive, such as a large water stain or mold growth.


The cost of replacement insulation will also depend on the type of insulation that needs to be replaced. Fiberglass batts are typically less expensive than spray foam. The cost of labor will vary depending on the region and the extent of the job being done. In general, you should budget for at least $1,000 for repairs after water damage.

Can I Replace My Damaged Insulation Myself?

Homeownership has many responsibilities, one of which is maintaining the home itself. Every house will need some repairs from time to time, and it’s important to know when to tackle the problem yourself and when to call in a professional. If your insulation is damaged, you might wonder if you can replace it. The answer depends on a few factors. First, you’ll need to assess the extent of the damage. If the damage is limited to a small area, you might be able to replace the insulation. However, if the damage is more widespread, it’s best to call a professional.


You’ll need to consider the type of insulation that needs to be replaced. Some types of insulation are easier to install than others, so if you’re not confident in your abilities, it’s best to leave it to the pros. Ultimately, replacing damaged insulation is a repair you can likely handle yourself, but it’s always best to err on the side of caution.

Call the Professionals When it Comes to Wet Insulation

Energy Monster is the leading provider of insulation services in the area. We specialize in insulation replacement and installation of all kinds, including fiberglass insulation, cellulose, and spray foam insulation. Our team is licensed and insured, so you can rest assured that your home is in good hands.


We understand the importance of energy efficiency and are committed to providing our customers with the best possible service. Contact our team today to learn more about our services and how we can help you save money on your energy bill.


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