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 Oak View, 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 November 08, 2025

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 January 2023
I would highly recommend John for floor installation. He and his assistant Josh were thorough and very professional and kind. They did a fantastic job! I am very happy and pleased with the outcome! Will definitely hire John again. Thank you John and Josh appreciate the work you did for me! Mel
Bergman Flooring
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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 September 2022
Mark did a wonderful job installing my level 2 EV Charger. Excellent customer service from the first phone call. I highly recommend and will call back for service. Thank you!!!
M W Electric
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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

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

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.

Installing insulation helps reduce energy usage, improve home comfort, and lower utility bills by maintaining stable indoor temperatures year-round.

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

The cost to install a radiant barrier ranges from $700 to $2,800, depending on the size of your roof and the type you choose. Most people pay an average of $1,700 to install a radiant barrier. Foil options, both single- and double-sided, cost between $0.10 and $0.90 per square foot, while spray-on options start at $0.60 and go all the way up to $1 per square foot—which can add up quickly.

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