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 Monrovia, 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 18, 2026

Reviewed in July 2026
The new garage door opener was installed quickly and professionally. Everything was tested before completion, and the system works quietly and reliably every day.
GARAGE DOOR PASADENA CA
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Reviewed in July 2026
The garage door opener was installed quickly and works perfectly. It operates quietly, responds instantly, and has made using the garage much more convenient.
Pattern Garage Doors
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Reviewed in July 2026
The new garage door opener was installed professionally and works flawlessly. It operates quietly, responds quickly, and has made everyday access much more convenient.
PATTERN GARAGE DOOR ARCADIA CA
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Reviewed in August 2025
Brilliant installation experience. The team put in a lot of effort to ensure silent operation and correct alignment. The final consequence is a garage door that always works perfectly and looks great.
Garage Door of Pasadena
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Reviewed in May 2022
Mr. Jesse and his team was always respectful. He did a new installation electrical panel. He did a excellent job.
Express Home Service Electric, Plumbing-Heating & A/C
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Reviewed in March 2022
Everything went well, installation was done quicker than quoted.
Insulation Labs
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Reviewed in May 2021
I was very impressed with the quality of the product, as well as their installation. I was impressed that the companys installer pointed out a scratch on the new door before installing and gave me suggestions on how to replace it. They are honest and professional.
California Security Screens, Inc.
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Reviewed in March 2021
Robert, did a great job installing my shower enclosure I would highly recommend him very professional
Gavidia Glass Services
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Reviewed in January 2021
Prompt courteous and professional but the installer didn't hear me when I told them I wanted to save the old but newer unit. Oops. . other than that everyting worked out well.. Great service.
Payless Water Heaters & Plumbing, Inc.
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Reviewed in December 2020
I had a doorbell problem where my doorbells (both traditional and Ring) didnâ t work. I originally had used another electrical company as they were tied in with my home insurance but after coming once to assess the problem (barely) they never came back and after trying to get a hold of them...
Coast Electric Company
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Doorbell Installation questions, answered by experts

Fiberglass is the best insulation for HVAC ducting because it's inexpensive, widely available, versatile, and long-lasting. Fiberglass also offers acoustic insulation in addition to thermal insulation, which can contribute to a more peaceful home environment. You can use other materials like mineral wool, but fiberglass is the industry standard.

Insulating an unheated garage can still be worth it. For instance, insulating an attached garage can help with heat loss from your house in general, and it can also make it easier to store electronics in your garage without worrying about them being exposed to extreme temperatures.

If you use your detached garage as a workspace, insulation can still make a difference. Plus, you can use space heaters and a window unit AC to help condition the space while you work without installing heating.

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.

Open-cell foam insulation has a life span ranging between 15 to 25 years when well cared for. However, the material may degrade sooner in areas with high humidity or after prolonged water exposure. Proper installation and maintenance can maximize its longevity but requires close monitoring. Closed-cell foam insulation has a longer life span of 30 to 50 years.

Yes, they address underlying issues, providing long-term seals and energy savings you might need help to achieve.

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