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>

What is the best type of attic insulation?

• <div><p>The best type of attic insulation depends on where you live, your budget, and what stage of construction the attic is in. For example, if you're building a house, then structural insulated panels are a worthy investment since they're easy to install during construction and they're the most energy-efficient type of insulation. </p><p>Additionally, if you live in a very warm climate, then you can potentially save quite a bit of money by opting for reflective insulation, which is more affordable than comprehensive insulation but doesn't work well for cool climates. Blown-in, loose-fill, and spray foam insulation are all great options for attics in moderate climates.</p></div>

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*The Angi rating for Doorbell Installation companies in Harrison, ID 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 June 22, 2026

Reviewed in June 2026
In early May, I contacted Straight Shooter Plumbing because a toilet and bathtub on my property were backing up with sewage. The technician recommended removing the toilet and using an auger to clear the line, which I approved. Shortly afterward, I discovered the technician had broken my shop...
Straight Shooter Plumbing and Rooter LLC
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Reviewed in December 2025
Cole did an awesome job installing a tankless water heater in a home where it was difficult to find a suitable installation location. His pricing was fair & he is a pleasant person to work with. 5-Stars.
Buckaroo Plumbing
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Reviewed in September 2024
Eduard, the owner of E&E Electric transformed my spec home into one that people think was custom built home upon entry. I had him either change existing fixtures or install new circuits, chandeliers and switches literally in every room. The best thing about the entire two week job was that...
E & E Electric LLC
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Reviewed in January 2024
Service requested: Installation of new windows and sliding glass door. Quality: Anderson Windows are of the the highest quality; the glass is so clear it's as there is no glass and the frames/seals are first rated. Value: In maintaining a property especially one in a remote location it...
Renewal by Andersen of Washington
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Reviewed in July 2022
We are very satisfied with the new composite deck and cable railing installed by Bugle Construction. The finished product has exceeded our expectations! Mike was easy to work with from doing site survey and understanding what we wanted to have done, to providing an estimate and providing status...
Bugle Construction JMJ, LLC
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Reviewed in February 2022
I spent 12 years on the real state field and I flipped the remodel of 17 high end homes and I would put James on the top of my list for cabinets installation, I have work with many providers but James is a really good professional
James Willard Finley
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Reviewed in September 2021
We were somewhat skeptical that these windows could justify the cost and meet the workmanship and efficacy our salesman claimed, but our expectations were exceeded with the way our job turned out. We had a large job (33 windows) our installers (Jared Boesl, Kyle Boesl, AJ Sebek and Dustin...
Renewal by Andersen of Washington
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Reviewed in May 2021
Due to covid etc there was delay in getting materials but it was ok since weather was better later. All through this I was kept informed of progress. Installation was just completed and it is beautiful.
Fireside Windows, LLC
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Reviewed in April 2021
Timely response to initial inquiry and then stayed in contact. Stayed on schedule. The quality of work was more than we could expect. Matt listened to what we wanted, gave us options, and made it happen. Installed new hardwood floors to match existing hardwood and then refinished old floors...
Character Hardwood Floors
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Reviewed in August 2018
The technician was polite and cleaned up the area after the mitigation fan installation. He was proactive and pointed out plumbing deficiencies he observed while working. I was very grateful as it eliminated a potential crisis situation.
Aqua-Max of Maine
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Doorbell Installation questions, answered by experts

If you feel your energy bills are too high or your HVAC system is working harder than necessary to maintain the correct temperature in your home, you may have an under-insulated home. If you’re unsure, consider having your system’s efficiency assessed by a local independent energy auditor.

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.

Monolithic slabs don’t require insulation, but many homeowners choose to have their contractors install insulation under the slab during construction. This can help improve home efficiency even more and keep indoor temperatures more stable. Slab foundations are more energy-efficient than uninsulated crawl spaces and basements, and insulated slab foundations are more energy-efficient than insulated crawl spaces and basements.

Yes, they address underlying issues, providing long-term seals and energy savings you might need help to achieve.

The best type of attic insulation depends on where you live, your budget, and what stage of construction the attic is in. For example, if you're building a house, then structural insulated panels are a worthy investment since they're easy to install during construction and they're the most energy-efficient type of insulation.

Additionally, if you live in a very warm climate, then you can potentially save quite a bit of money by opting for reflective insulation, which is more affordable than comprehensive insulation but doesn't work well for cool climates. Blown-in, loose-fill, and spray foam insulation are all great options for attics in moderate climates.

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