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>

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>

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Last update on November 26, 2025

Reviewed in November 2025
from testing to permits to installation of the new septic system Woosley handled it all! Also Tim Dan and Sam were great - knowledgeable individuals along with their support staff which made the task worry free. A big thank you to you all.
Woolsey Plumbing & Heating Co
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Reviewed in July 2024
Tony was prompt, thorough and installed an excellent antenna on our tower. Great reception with over 40 local channels from both Green Bay and Wausau. Would highly recommend.
Longwire Tech Services
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Reviewed in January 2022
Todd was very easy to work with, knowledgeable, and did an excellent job installing our new boiler. Highly recommend.
Conditioned Aire
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Reviewed in December 2021
They did an excellent job form sales to installation.
Mad City Windows & Baths
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Reviewed in December 2021
Tom and Ryla did great job on the Installation and in a timely manner we are very Happy with our Harman pellet stove
Earth Sense Energy Systems, Inc.
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Reviewed in October 2021
The entire experience with BadgerlandRestoration was positive. The office staff was very polite, answered all my questions, and continued to stay in contact with me through the entire process. They were very quick to respond with an estimate, completed the job when they said they would, and were...
Badgerland Restoration & Remodeling
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Reviewed in August 2020
Arrived on time. Friendly, got straight to work installed new 220 service and whole home generator. Professional, knows what he is doing, Coordinated with electric company organized. I would hire again if needed for another project OR recommend.
Specialty Electric & Data, LLC
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Doorbell Installation questions, answered by experts

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.

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing insulation.

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

DIY insulation installation is feasible, particularly for basic rolls or batts, if you have the right protective gear and knowledge. However, hiring a professional ensures even, full coverage for maximum efficiency.

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.

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