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 September 13, 2026

Reviewed in September 2026
Topsoil removal and install of sod. Did an excellent job. Very happy.
Concors Earthworks
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Reviewed in July 2025
Jaden did an awesome job !!! Stretched carpet in two different rooms, moved furniture & put everything back in place when he was finished. Plus fixed some laminate flooring that had been installed years ago incorrectly. Very professional, great attitude, reasonably priced and enjoyed talking...
Supreme Flooring
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Reviewed in August 2023
Kramer Siding did an excellent job installing siding on our new house! They are honest and took the time to attend to the details that made all the difference. We have large porches and the metal work is the best. If you want the job done right, give them a call.
Kramer Siding
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Reviewed in September 2022
It was a good experience however the first plumber they sent was polite but soooo slow. I went without hot water for 24 hours. The. â Right nowâ sent 3 plumber next day and installed in less than 2 hoursð ð
Right Now Heating Cooling & Plumbing, LLC
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Reviewed in November 2021
Words can't explain the quality of expertise of the doors installed and looks, best and reliable service I've ever experienced!
Prestige Overhead Door
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Reviewed in September 2021
Very professional and worth all the money I spent on my windows and installation.
All Weather Construction, Inc.
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Reviewed in July 2021
They also installed my security cameras and did a good job of that. Excellent service!
Reliable PC Tek Services, LLC
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Reviewed in April 2020
Right Now team are the best. Jeremiah gave us a quote and we could have had the systems installed the next day. We had 3 installers put systems in and they were very efficient. We had a little issue with the install but Kyle came and stayed until the heating system was working 100%. Would hire...
Right Now Heating & Air
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Reviewed in November 2019
it went very well, they installed my vinyl plank flooring and installed the window, door and base trim. the work was done in a timely and professional manner
east idaho hardwood floors
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Doorbell Installation questions, answered by experts

Fiberglass is considered a favorite garage insulation choice due to its combination of affordability, ease of installation, and overall effectiveness. Fiberglass provides good thermal resistance, helping regulate garage temperatures and minimize heat transfer. Additionally, fiberglass is moisture-resistant, reducing the risk of mold or mildew formation.

Reflective and high R-value batt or roll insulation are often considered energy-efficient, offering significant thermal resistance benefits.

Reduces energy costs, improves comfort, and prevents ice dams in winter.

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

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.

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