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 March 02, 2026

Reviewed in March 2026
RRH did a fabulous job. He replaced my plaster ceiling and installed drywall. Work was done in the amount of time he stated and he did not go over budget with needing to add more time or materials. Highly recommend.
RRH Remodeling/Construction
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Reviewed in June 2023
Installers were so polite and friendly. Super fast, job done very well. Would hire again for reno.
Bath Planet of Peoria
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Reviewed in April 2023
Great customer service!! Very knowledgeable and hard working. Professional and quick installations process!!
Guajardo's Home Solutions DBA Aqua Medic
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Reviewed in November 2022
I hired A&K decking fencing and more to replace my front and back porch. Prior to hiring them, the front porch steps were loose, the railing was ineffective (for the front porch) and there was no railing on the back porch leaving quite a bit of a drop-off, not to mention it was sloping and...
A&K Decking Fencing and More
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Reviewed in May 2022
We were interested in having an old concrete block shower in the basement relined with an insert, having the flooring redone and new fixtures installed. All had to be custom work since it was a larger space than normal. Joe and Will were great to work with, explaining the job and answering our...
Triple Service, Inc.
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Reviewed in January 2022
Brian installed three doors for me did awesome job and took his time clean up after explaining what been done before after IÃ¢Â Â m very please
Lavalle Construction
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Reviewed in November 2021
The company was excellent it went very well their staff and workers are very polite. They completed the job in least expected time and did a clean installation.
Elite Seamless Gutters, Inc.
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Reviewed in March 2021
I contacted AGG Roofing. Talked with Josh L and he helped me through the process of getting everything in order for my moms new roof. He and the crew were excellent, from the tear off, install, and clean up! Highly recommend AGG Roofing!
AGG Construction, Inc.
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Reviewed in October 2019
Great. Called and they were here in just a couple of days. Very nice young man (Josh) told us it was all so old, nothing was replaceable, which I already had figured. Installed new unit quickly, cleanly. Very happy with whole experience. Very glad to know such competent service is available...
Overhead Door Company Of Illinois Valley
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Reviewed in October 2018
pleasant, fast efficient. Initial contact very positive and signed contract. Installers completed the work next day. They were excellent, friendly, informative and efficient
Terminix
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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.

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

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.

Heat lost through uninsulated basement walls can account for up to 30% of the total energy lost through heat transfer to the outdoors. While homes in mild climates won't gain as much benefit from having an insulated basement as those in cold climates, the effects are still noticeable on your energy bill.

Installing insulation helps reduce energy usage, improve home comfort, and lower utility bills by maintaining stable indoor temperatures year-round.

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