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>

How do I choose the right type of insulation?

• <div><p>Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you <a href="https://www.angi.com/articles/r-you-using-right-type-home-insulation.htm">choose the right insulation</a>. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.</p></div>

Does ductwork need to be insulated?

• <div><p>Insulating your ducts offers several benefits, including:</p><ul><li><p>Improved energy efficiency: Duct insulation prevents energy losses, reducing heating and cooling costs.</p></li><li><p>Cost savings: Lower energy bills make insulation a cost-effective investment.</p></li><li><p>Environmental benefits: Enhanced efficiency reduces your carbon footprint.</p></li><li><p>Consistent comfort: Insulated ducts help maintain a stable indoor temperature.</p></li><li><p>Better indoor air quality: Reduced allergens and pollutants improve air quality.</p></li></ul><p></p></div>

What are the four common types of insulation?

• <div><p>While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.</p></div>

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Last update on October 21, 2025

Reviewed in October 2025
The job was done efficiently and we are very satisfied with the results. I would highly recommend this company for a bathroom remodel or shower installation.
Upgrade Remodeling LLC
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Reviewed in June 2024
Overall a good experience. Very professional and polite. Had to get a new heating system installed because it had been 20 years. Everything was out of date. They did a great job; didn't take too long. I'm pleased with the service and would recommend working with them.
Fleetwell Air Conditioning Heating & Plumbing
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Reviewed in January 2024
I was very pleased with the service provided by Johnson Electric. The service call was answered by Mick. He proved to be highly proficient in his job and was able to install me new light fixture in a timely manner. I was very pleased with his work and his personable manner. He went above and...
Johnsen Electric, Inc.
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Reviewed in September 2023
My installers were very professional and easy to talk to.
West Shore Home Winston-Salem
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Reviewed in July 2023
Bruce is AWESOME! He responded to my inquiry by phone within a few minutes even though it was late on Sunday night, showed up earlier than our appointment as I told him I would be home all day, and he and his installer showed up first thing to install our outside unit on Independence Day! His...
Southern Comfort Heating and Air, LLC
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Reviewed in March 2023
We have not received the product installation. Remodel USA has only measured our kitchen for the cabinets, put new doors on order. Installation will get done eventually.
Remodel USA Connecticut Windows
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Reviewed in November 2021
Installed a ductless minisplit for three rooms in my house. The work quality was superb. Would definitely recommend them to anyone looking for this kind of work.
Majic Air, Inc.
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Reviewed in May 2021
Very friendly and professional. On time and prepared to do the install.
Veterans Heating & Cooling
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Reviewed in December 2020
I have had worked performed on several occasions by Mr. Earl Washington- installation of water heater and toilet repair. The work that was performed was excellent and he is very professional and courteous. Mr. Washington is timely and responsive and follows through on his commitment to provide...
HotWaterExpress.com, Inc.
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Reviewed in August 2020
The following JES Appomattox location employees are to be commended for the job they did. Dylan impressed me when he came out to examine my needs. He gave me an estimated cost and was most helpful in emailing me everything I needed to get the job underway. Everyone I spoke with in the...
JES Foundation Repair
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Doorbell Installation FAQs, 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.

Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you choose the right insulation. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.

The most affordable way to insulate behind unfinished walls is to install fiberglass batts or rolls. These total around $0.75 per linear foot, with the width matching the gaps between standard studs perfectly. However, it’s important to consider the R-value of your insulation and the climate in your area, as fiberglass insulation isn’t the best in terms of preventing heat transfer. Plus, the most affordable option may cost more on electricity bills over time. The most affordable way to insulate behind finished walls is to leave them up and use blown-in insulation to avoid drywall replacement.

Insulating your ducts offers several benefits, including:

Improved energy efficiency: Duct insulation prevents energy losses, reducing heating and cooling costs.
Cost savings: Lower energy bills make insulation a cost-effective investment.
Environmental benefits: Enhanced efficiency reduces your carbon footprint.
Consistent comfort: Insulated ducts help maintain a stable indoor temperature.
Better indoor air quality: Reduced allergens and pollutants improve air quality.

While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.

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