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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*The Angi rating for Doorbell Installation companies in Hershey, NE 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 October 10, 2025

Reviewed in October 2025
Brandon was hired to remove a load-bearing wall in our kitchen to open up the area between the kitchen and living room. This involved building a temporary "false wall," removing the existing wall then, and laminating two 2 x 12's set on end as a header - secured above supports at each gap-end. ...
Seamless Drywall and Remodeling, LLC
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Reviewed in February 2022
We were visited by a traveling salesman, Tristan, on 12/08/2021 to discuss installing new windows to our house. During his presentation, Tristan seemed very upfront and honest. He explained the process, and what would be completed. During that time we were told the windows would be finished and...
American Remodeling Inc
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Reviewed in October 2021
He was very prompt about getting to our garage door. Very personable, cared about everything being just right. Didn't leave until everything was done and perfect. Also installed the garage door opener. He then programmed the garage door opener to our pickup. He has also worked on our...
Keep'em Rollin' Garage Doors
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Reviewed in August 2021
Troutman Contracting took out old chain link fencing and installed new wood privacy fencing. They also took out old flooring and installed new vinyl wood flooring throughout my home. I couldnâ t be happier with the work done!
Troutman Contracting, LLC
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Reviewed in February 2020
AHE did an excellent job in replacing the windows in my condo. I couldn’t be happier with the quality of the product and the crew that installed them. They make sure the jobs done right and they also do a wonderful job in the cleanup process. I guarantee you will be happy with the finished...
A H E
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Reviewed in August 2017
excellent service and excellent installers. would certainly hire again
Franzen Plumbing
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Reviewed in July 2016
Terrible! We had used Charlie's several years ago to replace a hot water heater and a recirculation pump. They did a fantastic job. The total cost was about $1300.00 which was very reasonable. I was totally satisfied. I contacted them for a leaky shower head, as they had been very good several...
Charlie's North Platte Plumbing
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Reviewed in October 2014
Sales man was knowledgeable. Prices were great beyond compare to other local companies. Fast response to a phone message left. There were upgrades available to my system that were never offered. I did my own research and added a couple items. Cost listed was for furnace, air conditioner and...
Bridges Counseling Services, LLC
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Reviewed in June 2014
Installed all the switches gave us helpful solutions along the way. Came up with the idea of having a motion sensor in our closet, since there was no good place to install a switch because of pocket doors. Installed cover panels around our wainscoting. Installed lighting fixtures. We have...
Electric Solutions
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Reviewed in July 2013
Our air conditioner quit working on Sunday, June 15th. We contacted Lusk heating and air conditioning on June 16th. A service representative was there by noon and informed us that the a/c was shot. Tuesday Brian came and gave us a quote of how much different a/c units would cost. Where the...
LUSK HEATING & AIR COND
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Doorbell Installation questions, answered by experts

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.

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.

Yes. Proper, complete insulation will ensure that you trap the most cool or warm air inside your home, preventing high energy bills. In addition, insulation tends to settle and compress, leaving gaps over time; the more you insulate completely during the initial installation, the less you’ll need to do down the line.

It is generally completed in a day, depending on the attic size and access difficulty.

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