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 Doorbell Installation companies in Glendora, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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Last update on July 21, 2026

Reviewed in July 2026
The installation team completed the project professionally and on schedule. The new garage door fits perfectly, operates smoothly, and looks fantastic.
Garage Door Pomona, CA
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Reviewed in April 2026
Good man installed my new ac!
Trust Heating and Air Conditioning, Inc.
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Reviewed in September 2025
Cost was low and installers were very professional.
Felikian's Carpet/National Flooring Outlet
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Reviewed in April 2024
Very good quick installation. Was very thorough and professional. Would definitely hire these guys again.
KCP Tech Solutions
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Reviewed in March 2024
The door instalation turned out great. Livi was really busy with other projects yet he gave up his Saturday to install my entry door for my ADU. If I ever need someone with Livi 's experience and expertise I would hire him to do the job. Thanks for a job well done.
Exact Door Services, Inc.
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Reviewed in November 2023
I was somewhat put off by the fact that the technician did not use my camera/doorbell, choosing to knock softly instead. I also prefer to get the invoice prior to payment. Otherwise, the outcome was good.
Speedy Garage Door and Gate, Inc.
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Reviewed in November 2023
Great guyâ s that did the installation. Highly recommend them
Path to Prosperity LLC
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Reviewed in June 2023
I would recommend this company for their knowledge, customer service, and speed of installation. After all the paperwork was done and we gave the green light to move ahead with the installation, everything was completed within a few weeks. The installers were polite, worked well, quick, and...
D.B. Kitchen & Bath Cabinets, Inc.
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Reviewed in January 2023
Very happy with the work. Installer Very knowledgeable and professional. I would hire this company again. Thank you for the great experience.
Lion Glass Installations, Corp.
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Reviewed in October 2022
Rigo ordered and just installed a sliding glass door in the back of our house. He did a great job! The door was a custom order and took four months to receive. Rigo kept us updated every step of the way regarding the status of delivery. Once we received the door, Rigo completed the...
First Choice Windows, Inc.
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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.

Depending on where you live and the conditions of your basement, you may not need to insulate your basement. Your best bet is to talk to a basement remodeling company to find out what they recommend doing.

Insulating your basement can help improve your home's energy efficiency, but it will also increase the cost of your basement remodel project. The average cost of installing basement insulation is $2,400.

They recommend sustainable materials and water-saving fixtures, tailoring choices to balance sustainability and style.

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.

A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.

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