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>

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Last update on July 18, 2026

Reviewed in July 2026
Francisco did a very nice job installing flooring leveling the floor first, baseboards snd and eood flooring wall, will deginitely hire him again.
Francisco Javier Rodriguez Arangure
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Reviewed in July 2025
Jessica and Mark are my go-to plumbing service no matter the scale of my project. I hired them to replace my water heater and install a new one as well as unclog a drain. In both jobs, they were professional, communicative, punctual, and so easy to work with. I appreciate how they were able to...
Sierra Line Plumbing
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Reviewed in December 2023
It's been over a year and the system is operating like a champ. The app is awesome and our PG&E True-up was negative. Before we met with any companies, we spent dozens of hours researching panels and micro-inverters, and decided we were leaning toward Sunpower solar panels and Enphase micro...
SunMade Energy
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Reviewed in July 2022
Windows were not what I expected and installation had to be completely redone. I will not use it again.
Sears Home Improvements - Windows
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Reviewed in August 2020
Best service provider of all time! They did a next day appointment to troubleshoot my AC and install smart thermostats. Santos, our technician arrived on time, wearing a mask and foot protectors. Fixed the AC issue and installed the thermostats perfectly. Cleaned up the drywall dust and verified...
Energy Smart Engineering, Inc.
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Reviewed in April 2020
DO NOT HIRE! This person was a waste of time and money and I cannot caution others strongly enough to keep them out of your home. He was completely unprofessional with no time management skills, zero respect for other people’s time, and the quality of his work was terrible. If you haven’t...
Funky Monkey Fix It Service
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Reviewed in March 2020
I needed an electrician for a very small job and Cornett lighting answered my call right away. Eli (owner) showed up and installed and completed the job. Not only did he complete the electrical part but also added some other nice touches to the job. He is VERY professional and VERY fair...
All Starr Electric and Solar, LLC
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Reviewed in January 2020
I thought $100.00 to program our car to the new opener was excessive. This has been done previously by other companies as a no charge courtesy. It took the installer one minute to do it.
Precision Overhead Garage Door Service
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Reviewed in November 2019
I hired Tyson Hatch owner of TLH Hardwoods, LLC through HomeAdvisor to install a wood floor in a home that we had recently purchased. His quote was just pennies higher than the lowest quote we found on our own and his work ethics along with his professionalism were beyond belief. He came to give...
TLH Hardwoods, LLC
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Reviewed in September 2018
Mitch and his team gave me a solid high-quality product for a fair price. The owner of the company personally followed up with me and answered all of my questions. The team did the install in one day and the results were amazing. I highly recommend Turf Exchange!
Turf Exchange
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Doorbell Installation questions, answered by experts

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

The best type of insulation for your home depends on your specific needs, climate, and the area you are insulating. For new construction, structural insulated panels are a highly energy-efficient option that is easy to install during the building process. In very warm climates, reflective insulation can be a cost-effective choice. For cold climates, fiberglass is an excellent option due to its high R-value and resistance to settling over time. Spray foam works well in humid environments because of its moisture-resistant properties. For standard attics, loose-fill, spray foam, or blown-in insulation are all suitable options.

Insulating an unheated garage can still be worth it. For instance, insulating an attached garage can help with heat loss from your house in general, and it can also make it easier to store electronics in your garage without worrying about them being exposed to extreme temperatures.

If you use your detached garage as a workspace, insulation can still make a difference. Plus, you can use space heaters and a window unit AC to help condition the space while you work without installing heating.

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.

The life span of insulation is between 20 and 100 years. At that time, existing insulation can fall victim to gravity, resulting in compression, which reduces its insulating protection or R-value. If you can't simply add more insulation over the existing material, removing the old to increase the effectiveness of the new can reduce your energy bills and make the project worth the time and money investment.

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