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 April 06, 2025

Reviewed in April 2025
Good, professional, friendly & prompt service — from sales representative to installers. In summary, a good product for floor covering and good service! I highly recommend Guardian!
Guardian Garage Floors
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Reviewed in July 2024
Javier, the owner was quick to respond to my project request and very respectful. He and his crew did a great job preparing a damaged wall and installing a tile kitchen backsplash as well as installing an outside vent for our range hood. It's rare these days to find someone so reliable,...
Mountain Top Home Remodeling, LLC
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Reviewed in July 2024
Installation team was excellent in all respects.
Express Flooring Albuquerque/Santa Fe
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Reviewed in April 2024
Joe and his crew did an amazing job on installing some flagstone for me. They were very professional and punctual, they accommodated all the requests I had! Will definitely be calling them for more work.
Capital Landscape Solutions
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Reviewed in August 2023
Very professional and installation was quick
Nespolo Mechanical, LLC
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Reviewed in September 2022
Very prompt and professional installation. Recommend highly
Turf and Rock Creations, LLC
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Reviewed in August 2021
Very professional installation of mini split system. Electrician provided was also very very professional. Very satisfied with the project
Cypress B Plumbing & Heating
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Reviewed in May 2021
very responsive to need for rapid installation
Lavery Home Improvements, LLC
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Reviewed in September 2020
Leo and Billy were very professional and courteous installers and retrofitted our living room with two new windows quickly and precisely. I had done my own electrical work to prepare for the installation and they provided good feedback on minor shifts needed to accommodate one of the window...
Dreamstyle Remodeling
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Reviewed in September 2020
A very difficult Elite installation in a new home. Care given to HVAC and electrical. The sky lights turned a dungeon hallway and guest bath into a well lighted amenity. We are so grateful.
Evolving Concepts Construction LLC
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Doorbell Installation questions, answered by experts

Improves water efficiency, reduces oversight, and enhances landscape health.

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 lifespan of crawl space insulation depends on how well you maintain your insulation and the type of insulation. Fiberglass will need replacing every 15 to 20 years on average if you don't have a vapor barrier in place. If you do have vapor barriers in place, then your insulation could last much longer. Spray foam insulation can last anywhere from 80 to 100 years.

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.

Yes, including recycled denim and cellulose from natural fibers.

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