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 August 10, 2026

Reviewed in August 2026
Text set up with NMB Electric for EV level 2 charger installation was quick & effortless. They planned using my submitted breaker/garage photos. Their suggested (highly rated) brand/model came from Amazon overnight. Jesus showed up as specified, fielded a few of my questions and had the...
NMB Electric
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Reviewed in November 2025
Beto did a great job installing seven interior doors in our house. Did quick and accurate work. I would hire him again in a heartbeat.
Elite Windows & Glass, Inc.
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Reviewed in October 2025
I couldn’t ask for better service and results. I needed to install a replacement wood slider door that also had to be stained to match my existing windows…….perfect!
EC Construction & Remodel, Inc.
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Reviewed in April 2025
Great job , very clean , on time , very friendly and pretty affordable prices. They surprised us , Maldin told us that they would install 6 interior doors in the same day and we were thinking it was going to take 2 or 3 days because of our experience with all our other contractors that we used...
MB WINDOWS CO
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Reviewed in February 2025
Excellent service. Arrived right on time. Went with me to return a generator which was incompatible with my home. Then went with me to purchase the correct generator. Installed the new one.
Gold Coast Power Inc.
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Reviewed in December 2023
We called at the last minute for 2 new faucets to be installed and JEM came to give a bid and was able to install right away. Great problem solving and workmanship. He's in our contact's now!!!
Handymen Professional. JEM - Unlicensed Contractor
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Reviewed in September 2023
Amazing and quick customer service. Corey came to my rescue to replace my lost car key, when my car dealer didnâ t respond. He is very friendly and professional and helped turn a stressful situation into a fun learning experience. I have continued to use him and his expert team of locksmiths...
Friedman Lock & Key
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Reviewed in December 2022
Felix & Santangelo not only arrived on time, they handled the installation and removal of toilet in record time. Great.
All American Plumbing & Drain
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Reviewed in November 2022
Kevin helped me install an EV charger in my garage. He had great communication skills, he was very knowledgeable on the million questions that I had asked him. I would definitely hire him again. Thanks again Kevin!
Kevin Konzmann
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Reviewed in July 2022
Great experience. Prompt, and did outstanding work on the installation. Best price for the type of system. I would definitely recommend.
Pro Water Solutions, Inc.
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Doorbell Installation questions, answered by experts

Monolithic slabs don’t require insulation, but many homeowners choose to have their contractors install insulation under the slab during construction. This can help improve home efficiency even more and keep indoor temperatures more stable. Slab foundations are more energy-efficient than uninsulated crawl spaces and basements, and insulated slab foundations are more energy-efficient than insulated crawl spaces and basements.

Yes, professionals install and upgrade insulation for all home or business areas.

The time required for insulation installation can range from a few hours to a few days, with most projects taking 1-3 days to complete. The final duration depends on the project's size and complexity, the area size, and the type of insulation being installed.

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.

Several types of insulation are effective for crawl spaces, with spray foam and rigid foam boards being two of the best options. Closed-cell spray foam insulation is a strong choice because it effectively repels moisture, resists biological growth, seals the air, and provides excellent thermal protection, especially in hard-to-reach areas. Rigid foam insulation boards are another excellent material as they insulate well, resist water damage, and will not settle over time like fiberglass or cellulose.

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