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 May 28, 2026

Reviewed in May 2026
I really appreciated how thorough Cody was with everything. He inspected the attic and explained the quality of their products with a clear warranty. I'm looking forward to my new roof being installed!
DaBella - Fargo (Bath/Siding)
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Reviewed in March 2026
Austin worked on repairing shingles on my roof and also installing a metal her roof over a porch. He was timely and responsive to my request and was very easy to work with. He also provided me with some recommendations regarding previous quality of installation of shingles. Would definitely hire...
ALB CONSTRUCTION LLC
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Reviewed in September 2025
Got the job down in a timely fashion. Paid in full. Can't get them back to fix problems that came up shortly after install. Won't accept calls or return calls. Product is good but service is not. After spending over $40,000 one would expect prompt service on what should be a warranty...
OVERHEAD DOOR COMPANY OF FERGUS FALLS
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Reviewed in July 2020
Excellent. Work was performed timely and the way we wanted it. We have a smaller cabin and needed utilities installed in a smaller closet. We also had a complete cabin remodel. Work was professional and completed on time.
JBS Builders LLC
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Reviewed in March 2020
Called as promised in advance of installation, and arrived earlier by agreement with us. Did a thorough job, and cleaned up well afterwards. Even tested our dishwasher to ensure that it still worked well after having to disconnect during the installation of our new garbage disposal.
Rigstad Installation
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Reviewed in July 2019
the install of new furnace and AC unit was fast and the cleanup was excellent Thank You especially when it was done during the heat wave Thank You Again!!
All Season's Heating and A/C, LLC
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Reviewed in June 2019
Very professional. Went through all the controls and explained everything. Made recommendations on how othen to water. The guys who did the install did a great job. Cleaned up everything. I would highly recommend sprinkler king.
Sprinkler King
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Reviewed in January 2019
Got a new water heater installed for us quickly.
Kabin Kare Inc.
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Reviewed in April 2017
The installers were very personable and friendly. Explained what they were doing and aswered all of our questions. Work was done on a timely basis and the work area left clean. I've no problem recommending this company.
Fox's Flowrite, LLC
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Reviewed in July 2016
They were quick to response! Update: 08/05/2020 Initially liked the company and had them install a new furnace and an AC about 4 years ago. Last Fall, I paid for their maintenance plan and was told I would be called for an AC check-up in the spring. This never happened. When AC problems arose,...
Hoffman Cooling and Heating
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Doorbell Installation questions, answered by experts

Insulating your home's exterior walls can realize up to a 20% reduction in your monthly energy bills. This means that regardless of how much the project costs, it can begin to pay you back immediately. Additionally, adding spray foam and other high-end materials can increase the selling value of the property.

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.

Ductwork should be wrapped in insulation in certain locations. This includes unconditioned interior parts of the home, such as attics, crawl spaces, basement ceilings, and between floors. Duct joints should also be insulated since they're more likely to leak air than other parts of your system. Building codes in some areas also require ductwork to be insulated.

The cost to install or upgrade insulation generally ranges from $1.50 to $4.00 per square foot. The final price depends on factors such as the type of insulation chosen, the total area to be covered (home size), and local labor costs.

DIY insulation installation is feasible, particularly for basic rolls or batts, if you have the right protective gear and knowledge. However, hiring a professional ensures even, full coverage for maximum efficiency.

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