Should you remove old insulation before adding new insulation?

• <div><p>You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.</p><p>However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.</p></div>

How much does drywall insulation cost?

• <div><p><a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">Drywall insulation costs</a> around <b>$1,800</b>, on average, but prices can range from <b>$500 to $4,500</b>, depending on a few different factors. The following things are important considerations to make when pricing out your insulation project:</p><ul><li><p>Square footage of insulation</p></li><li><p>Type of insulation </p></li><li><p>Climate in your area and the insulation R-value required</p></li><li><p>Whether or not your walls are already finished</p></li><li><p>Accessibility of the area </p></li><li><p>Whether or not you need old insulation removed first</p></li></ul><p></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 March 03, 2026

Reviewed in March 2026
Great job and fast installation
Cali Construction
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Reviewed in September 2024
They exceeded my expectations!!! Great installers
Caffey Construction
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Reviewed in May 2020
Windows came in quickly after measurments. Installer had a difficult time getting the old windows out . Normally the job should have taken two to three days max, it actually took 7 days. Extra help should have been sent for job.
Paradise Builders, LLC
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Reviewed in June 2019
I hired Jamey Peterson to fix a soffit with siding under my porch and to put in new windows . I ordered the windows on March 4 . He told us at the time he would have the soffit done in two weeks . I did not hear from him so I gave him a call .He then told me he had a accident and he would just...
Veteran Home Exteriors
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Reviewed in October 2018
fair priced, on time, good job. installed new fence in two days.
Oakley Construction
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Reviewed in December 2015
I was very impressed by the guys at 1-800-Plumbers! They listened to my wants, needs and concerns and then suggested several options of what could be done. They installed a high effeciency Rheem water heater and also made piping revisions to bring my home up to code. They were extremely...
1-800-Plumber
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Reviewed in February 2014
I was told by the local ATand T provider that POTS (Plain Old Telephone Service) was NOT available in Royal Oak. I discovered approximately one (1) month later, after I returned to Texas, that was not true, that POTS WAS available. ATand T just wanted to and continues to, push Uverse this is a...
AT&T
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Reviewed in November 2013
They did a good job with the installation. They were quick and I was happy with their service. I had just hoped that the carpet would last a little longer. The areas we have walked have already started matting down.
WITT FLOORING CTR
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Reviewed in February 2013
After a terrible experience with previous sprinkler system repair/update, we had Ammons Landscape install a brand new system. I could not have been more pleased. The system works perfectly and as advertised. The installation went smoothly and all aspects of the job were handled very...
Ammons Companies LLC
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Doorbell Installation questions, answered by experts

You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.

However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.

Air sealing isn't necessary for attic insulation, but it's incredibly helpful since it can help you identify and patch any existing air leaks. Failing to find these leaks before adding insulation can render your insulation less effective, leading to higher energy bills and potentially costly repairs down the line.

When it comes to fiberglass insulation versus foam board, there are a few notable differences, both aesthetically and functionally. Fiberglass insulation is soft and flexible, meaning it can be squeezed into tight spaces more easily than foam board. Fiberglass insulation also has a higher R-value, making it a better pick for colder climates. However, foam board insulation can resist moisture and pest damage much better than fiberglass.

Drywall insulation costs around $1,800, on average, but prices can range from $500 to $4,500, depending on a few different factors. The following things are important considerations to make when pricing out your insulation project:

Square footage of insulation
Type of insulation
Climate in your area and the insulation R-value required
Whether or not your walls are already finished
Accessibility of the area
Whether or not you need old insulation removed first

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.

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