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>

How do I add insulation to existing walls?

• <div><p>If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install <a href="https://www.angi.com/articles/blown-in-insulation.htm">blown-in insulation</a>. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than <b>$100</b>. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.</p></div>

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Last update on August 28, 2026

Reviewed in August 2026
I had an excellent experience with this company! They installed luxury vinyl flooring in my home, and the finished result looks absolutely beautiful. The crew was professional, dependable, and paid close attention to detail throughout the entire project. They completed the work efficiently, kept...
Jack of All Trades
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Reviewed in December 2025
Matt did a full septic installation on a new build house. He did a great job with the system, and gave flatter and more yard space after the system was put in. The grading and shaping of the land was superb
WoodRock Construction
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Reviewed in August 2025
Zukes installed a Metal roofing on our house. Rott was left in the overhangs . We paid for it to be replaced. They came back to look at it & agreed it should have been replaced. They offered to reimburse me to fix it myself. I declined They should do it . We were told it would be taken care...
Zooks Roofing Systems, LLC
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Reviewed in July 2025
Dave is awesome!! He’s quick to respond to our work request and worked on it even on the weekends. He went above and beyond with the project. Installed our wall outlets, tidied up the wires in our basement, installed new lights and even checked on some areas that needed fixing. He’s...
Dave Lynch Home Repair Service
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Reviewed in June 2025
Ashish did a great job getting my files from my old computer to my new computer. He also helped me buy & install a new printer. He accomplished everything I needed & then some. Awesome work!
Geeks on Site
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Reviewed in October 2024
Roof looks great after install. Workers cleaned up after the job. Price was fair and quote was detailed so all costs were understood before job was started. I highly recommend GT Roofing for their detailed communication, quality of work and value for the price.
GT Roofing
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Reviewed in February 2023
Four days before Christmas my boiler went. I called on a couple contractors, but was eventually referred to Bill's by a coworker. He got me a quote quick for a new boiler install including an additional 10 foot run of baseboard heating, which was much needed. The guys were there on time,...
Bill's Plumbing Heating & Air
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Reviewed in February 2023
We are very satisfied with the work they did on our house. They gave us a free itemized estimate before we decided to hire them. They out bid the other 4 contractors we dealt with. Through out the process they send us photos of the work being done. They Saved us thousands of dollars on our...
J Home Improvement, Inc.
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Reviewed in April 2022
Straight forward with cost very on job professional. They took a roof that was put on in 1860 and brought it into the 2020s and was cheapest in installation by $4500.
JV Contracting
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Reviewed in February 2021
Evolution Tech was very professional and helpful. Kailash provided great customer service! Iâ m very happy with the home entertainment installation.
Evolution Tech Solutions
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Doorbell Installation questions, answered by experts

Reduces energy costs, improves comfort, and prevents ice dams in winter.

It's essential to use insulation materials specifically designed for air ducts. Common types of duct insulation materials include fiberglass, foam board, and reflective foil. These insulation materials have the right properties to withstand the temperature and airflow conditions within the ductwork. Using the appropriate insulation not only ensures efficient temperature control but also prevents potential safety hazards or the release of harmful particles into the air.

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 need to insulate behind finished walls, the best option will likely be to have an insulation professional install blown-in insulation. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than $100. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.

The life span of fiberglass insulation can be as long as 80 to 100 years, but because of changing building codes, it’s best to get your insulation checked every 10 to 15 years. Signs of degrading fiberglass insulation include bits of batts on the floor or batts detached from frames. Having optimal, healthy insulation in your home will improve its energy efficiency, lowering your monthly bills.

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