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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Last update on October 06, 2025

Reviewed in October 2025
Reasonable price, quick turnaround. Installation of two new doors was done in half a day by a professional, friendly team, and resulted in a beautifully well done job. Scott, the coordinator, did all the advance work, took time to discuss all aspects of the process, including scheduling a...
Doors Done Right - Garage Doors & Openers
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Reviewed in August 2024
Vert nice front door. Reasonable price. Effi ient workmen. Happy with installation.
Castle - The Window People
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Reviewed in August 2024
It was a wonderful experience working with Michele. She guided us so nicely showing various options and help us make a decision. Installation was done nicely. High recommend.
Universal Windows Direct of New Jersey
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Reviewed in April 2023
John is very friendly and performed the required installation very quickly.
Mr. Handyman of S. Orange/Westfield/Scotch Plains & Metuchen
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Reviewed in January 2023
Wonderful work. Very knowledgeable and friendly installers. Fair price. Would definitely recommend!
Watts Good Electric
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Reviewed in January 2023
Arrived when promised. Price as quoted. The storm door he replaced looks great. The install was done very professionally. Work area left clean.
Solomon Handyman Services, LLC
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Reviewed in July 2022
Very prompt and efficient. Installed the shower door in 2 days. Great service.
Class Chef
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Reviewed in February 2022
The entire process was very smooth, professional and greatly appreciated - from our sales representative Bill to Ray who previewed the job and Bryan & Mikahl who did the installation. Friendly , thorough and appreciated. The end result immediately after installation looks just as advertised and...
Luxury Bath NJPA, LLC
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Reviewed in August 2021
Mike and his team did an excellent job of installing a ring doorbell at my home. Their services were prompt and efficient. When the job did not go as planned, he offered a simple solution with a clear explanation. I would absolutely hire again with any home wiring/security needs.
TREMBO ELECTRICAL REPAIR LLC
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Reviewed in July 2021
We had to wait a little longer then we would have liked to get the door installed but overall very happy with the they were clean and polite
Luxury Bath NJPA, LLC
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Doorbell Installation questions, answered by experts

Fiberglass is considered a favorite garage insulation choice due to its combination of affordability, ease of installation, and overall effectiveness. Fiberglass provides good thermal resistance, helping regulate garage temperatures and minimize heat transfer. Additionally, fiberglass is moisture-resistant, reducing the risk of mold or mildew formation.

Minimal maintenance is required, though regular inspections to ensure insulation hasn't shifted or deteriorated can improve performance over time.

Rigid foam board insulation is one of the safest insulation materials for basement walls. The panels offer a moisture barrier to prevent mold and mildew build-up. At the same time, this material is also fire-resistant, so you don’t have to worry as much about a fire breaking out as you would with spray foam insulation.

In addition to adding insulation to your attic, you may want to add a radiant barrier. A radiant barrier works by using reflective material, such as foil, on the attic floor. As heat penetrates the roof and enters the attic, the radiant barrier reflects the heat upward and back through the roof. If you receive a lot of direct sunlight on the roof, using both a radiant barrier and insulation in your attic can provide significant benefits.

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.

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