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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*The Angi rating for Doorbell Installation companies in Metropolis, IL 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 February 11, 2026

Reviewed in February 2026
These guys can do anything. I had them replace the floor in my tile shower, install an attic door, and add a new facial, and siding on my garage. They show up when they say, and work all day.
V&G Renovations
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Reviewed in June 2025
Michael and his crew were exceptional! We’ve already asked them about doing additional work. These work in this phase included adding multiple Light fixtures both inside and outside, framing two Doors in garage installing 3 Ceiling Fans including adding Wall switches. The prices were fair and...
LHR Services LLC
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Reviewed in December 2024
Good installation . Ready for descaling after a year and canÃ¢Â Â t reach the office. Message system full and just cuts off.
Aztec Plumbing
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Reviewed in July 2024
David and his crew did an excellent job installing my roof. He gave me a fair estimate that he stood by when the job was completed. They were timely and did a great job cleaning up even the smallest debris. David has a friendly way in working with you. I have him working on several more...
True Line Roofing LLC
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Reviewed in November 2022
They arrived and immediately started work. They were friendly and did a very good job installing the gutter guards. I would highly recommend them to anyone.
A+ Gutters
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Reviewed in October 2022
They were easy to get in touch with and kept me informed of the delivery date. They were delivered as promised and I am very pleased with the installation.
AmeriSide Exteriors
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Reviewed in September 2022
Installed in a day and area cleaned up thoroughly.
Primax Compozit Home Systems
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Reviewed in September 2022
Installed our bay window and removed old window. New window is great! They cleaned up as they went and left not a single nail nor splinter of wood. Window is sealed tight and beautiful.
Compozit Home Systems
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Reviewed in October 2021
All went well. Installation was great. Crew were prompt to site everyday. Cleaned up nicely. All our vinyl was laid out smooth and trimmed neatly. Final look fantastic. Still having neighbors stopping by at the curb to compliment us on our vinyl install. We just love the transformation it made...
Ayres Building & Roofing, Inc.
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Reviewed in April 2021
They replaced my windows, siding, and gutters. They also built a new porch cover. The job took months instead of days. They installed the wrong siding. They left a few old windows in the yard. They built a shed roof over the porch instead of a gable roof. When I complained, they just added a...
Sears Home Improvements - Windows
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Top-Rated Doorbell installation pros in Metropolis - Updated Nov 2026

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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.

When it comes to fiberglass insulation versus foam board, there are a few notable differences, both aesthetically and functionally. Fiberglass insulation is soft and flexible, meaning it can be squeezed into tight spaces more easily than foam board. Fiberglass insulation also has a higher R-value, making it a better pick for colder climates. However, foam board insulation can resist moisture and pest damage much better than fiberglass.

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

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

Fiberglass is the best insulation for HVAC ducting because it's inexpensive, widely available, versatile, and long-lasting. Fiberglass also offers acoustic insulation in addition to thermal insulation, which can contribute to a more peaceful home environment. You can use other materials like mineral wool, but fiberglass is the industry standard.

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