Should I remove old attic insulation before adding new?

• <div>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: <ul><li>If the insulation is over 15 years old</li><li>If the insulation is wet or moldy</li><li>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></li><li>If you see signs of pest infestation</li></ul>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</div>

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*The Angi rating for Insulation Service companies in , is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Insulation Service needs.

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Last update on December 24, 2025

Reviewed in June 2024
The three Techs did a great job of removing all the old bat insulation. Cleaned the attic, then sprayed the Intier attic space with mold neutralizer, before installing the new insulation. Arrived at 8:45, completed the installation cleaned the Intier area, and left by 2:30. Great group of Guys....
Insulation Co., LLC - Removal & Clean Outs
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Reviewed in February 2023
They were so pleasant and efficient; it also turned out that due to the structure of our home they couldn’t insulate as much as we wanted, but they cut the cost accordingly so that we didn’t have to pay the original quote amount.
RetroFoam of Central Ohio
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Reviewed in April 2022
Koala Insulation was professional and thorough.
Koala Insulation of Central Ohio
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Reviewed in March 2022
The installers and sales tech were both professional and polite I would recommend them to anyone needing insulation services
Advanced Attic Insulation
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Reviewed in February 2022
My husband and I hired Home Insulation Experts, Inc to work on the recently flipped home we just purchased. The crew removed all the old insulation, disinfected the entire attic and installed new blown insulation.
Home Insulation Experts, Inc.
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Reviewed in January 2022
Did a great job. Very friendly and professional. Our patio door is working much better after Joe came over to fix it.
Joseph Posani
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Reviewed in January 2021
We used Unique Hardwood Floor LLC three years ago to work on the floors of a 70 year old home that needed a great deal of work. Some floors needed repairs, some were replaced and others just needed to be refinished. It was a complicated job as they needed to blend the old and the new to create a...
Unique Hardwood Floor LLC
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Reviewed in April 2020
The project went smoothly. They arrived on time and worked all day. Completed the project the following day. Crawl space walls are now insulated, and 20 mil barrier installed throughout.
Ohio Basement Authority
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Reviewed in January 2020
Honest and upfront. The other company I had out tried to sell my items I didn t need. Thank you mark and stay dry
Stay Dry Waterproofing, LLC
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Reviewed in May 2018
The salesperson who came to my home was fantastic. He sat down and took time to answer all my questions and he gave great input. The job was a three-day process and each day the crew would call ahead to let me know they were on their way and would explain in detail what they were going to do....
Garage Floor Coating of Columbus
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Insulation questions, answered by experts

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

Yes, you should insulate your PEX pipes if you’re wondering how to keep water pipes from freezing. Pipes in uninsulated rooms or outside the house should always be insulated. If you’re looking to save money, you may not always need to install insulation on PEX pipes that are running through interior walls with insulation.

Mold can grow on garage ceiling insulation, which is why it’s important to install a vapor barrier behind the insulation and keep the space cooled and heated as you would your living area. Doing so will more or less eliminate the risk of mold growing on your garage ceiling insulation. You can also install a self-draining dehumidifier to help remove moisture, or opt for a foam board insulation or spray foam insulation that won’t harbor moisture and mold.

You can insulate an existing garage door. But while it’s a cost-effective option upfront, it may not perform as well as a garage door that comes with insulation. If you live in a colder climate—or if you plan on working in your garage and need a new door—you should purchase one with existing insulation for better efficiency.

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