Should I remove old attic insulation before adding new?

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

Can you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</p></div>

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*The Angi rating for Doorbell Installation companies in Hemet, 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 March 23, 2026

Reviewed in March 2026
Joe was detailed oriented and professional. Pet door installation completed.
Joe Handyman
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Reviewed in September 2025
Awesome company in every regard. Outstanding Window products excellent installation very professional. You will not be disappointed.!
Jordan Exteriors
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Reviewed in February 2025
Friendly interaction throughout. I requested what I would like installed as detailed as I can and he went on to do some extensive research on his own to understand the product and its functions. He even called their customer service to verify some details before installation (others didn't)....
Mr. Watts Electric
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Reviewed in January 2024
My alarm system was installed by Pedro, he did an amazing job as installer and representative.
PMF Tek Security LLC
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Reviewed in August 2023
The technicians showed up on time and did minor extra work to ensure the install was safe.
Stauffer's Electrical Systems
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Reviewed in July 2023
Great install and customer service
Icee Hot Air Conditioning & Heating
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Reviewed in October 2022
installed doggie door in garage door.
Local Hand Handyman Service
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Reviewed in September 2022
Good honest work. Everything was installed properly and in a timely fashion
Menifee Valley Plumbing, Inc
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Reviewed in September 2022
installers were very professional and knowable courteous and always on time and explained the installation as they when along thank you daniel alvarez and ignacio montes
Dreamstyle Remodeling of New Mexico
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Reviewed in July 2022
I already have a shower door and just need installation. While other companies just want to provide the whole package, door and installation, Lion Glass Installation Corp was so nice to do installation for me. Eloisa communicated with me very promptly, told me a very reasonable price; and an...
Lion Glass Installations, Corp.
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Doorbell Installation questions, answered by experts

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

The life span of insulation is between 20 and 100 years. At that time, existing insulation can fall victim to gravity, resulting in compression, which reduces its insulating protection or R-value. If you can't simply add more insulation over the existing material, removing the old to increase the effectiveness of the new can reduce your energy bills and make the project worth the time and money investment.

Insulation is professionally installed by measuring spaces, cutting materials to fit correctly, and placing them without gaps for optimal thermal resistance.

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.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

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