Should I remove old attic insulation before adding new?

• <div>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: <ul><li>If the insulation is over 15 years old</li><li>If the insulation is wet or moldy</li><li>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></li><li>If you see signs of pest infestation</li></ul>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</div>

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*The Angi rating for Doorbell Installation companies in Affton, MO 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 05, 2026

Reviewed in February 2026
The installers did a great job of installing a new quality basement door.
Midtown Home Improvements, Inc. (St. Louis)
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Reviewed in October 2024
Brda Electric answered my initial inquiry quickly, and within minutes, I was scheduled, using their scheduling software. Zach arrived on time, wore shoe covers and answered all of my questions. He was very delightful to work with and was able to add on a service that I hadn't initially...
Brda Electrical Co
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Reviewed in September 2024
The installers were very professional and polite! I give them 5 stars!
Newpro Operating, LLC
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Reviewed in August 2024
Communication was great. Install went well. Area was cleaned up afterwards. 10/10.
Hyperion Glass Company
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Reviewed in November 2022
Worked with Scott several times installing doors windows and many more projects. Excellent to work with. Quality job.
Good Karma Cabinets and Carpentry
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Reviewed in September 2022
Keith did a great job installing our new basement door. He did quality work, was professional and friendly, good with communication, and very easy to work with. Thanks, Keith!
JCE Installation and Repairs
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Reviewed in August 2022
Prompt, courteous, good price, excellent install and cleanup.
St. Louis City Exteriors, LLC
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Reviewed in March 2022
SirVent came to my home at no-charge to give me a bid. They even brought along a few different sized chimney caps but none worked. When the special order size came in they did the installation even though I was out of town, sent pictures of the installation and took payment after the fact. Very...
SirVent STL
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Reviewed in February 2022
The whole process was easy and painless from ordering the door to having it installed. Highly recommend, will hire again.
Chaney Windows and Doors LLC
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Reviewed in February 2022
Installation of Ring Doorbell and camera in garage. Very professional, courteous and knowledgeable. Would highly recommend them. February 2022
Wired Alarm & Surveillance Protection, LLC
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Doorbell Installation questions, answered by experts

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

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.

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 is generally completed in a day, depending on the attic size and access difficulty.

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

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