How do I add insulation to existing walls?

• <div><p>If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install <a href="https://www.angi.com/articles/blown-in-insulation.htm">blown-in insulation</a>. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than <b>$100</b>. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.</p></div>

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Verified Reviews for Doorbell Installation pros in Fenton, MO

*The Angi rating for Doorbell Installation companies in Fenton, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

*The HomeAdvisor rating for Doorbell Installation companies in Fenton, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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 December 2024
Installers very friendly and did a beautiful job.
Midtown Home Improvements, Inc. (St. Louis)*
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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 October 2022
Fast appointment for quote and installation. Work done in a professional way.
LeafFilter Gutter Protection
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Reviewed in April 2022
The installers were prompt and professional. One of them even vacuumed up all the dead ladybugs while she was up on a ladder installing tint on upper windows!!! I am thrilled with their service and their product.
Total Tinting
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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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Reviewed in January 2022
Door installation was done quickly and professionally. My only concern was the time to get the door delivered.
Midtown Home Improvements, Inc (Atlanta)*
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Reviewed in June 2021
Installation was quick, efficient and looks great!
CVM Enterprises, Inc.
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Reviewed in March 2021
Power Up installed three items. 1. They installed an electric service for our new freezer. 2. They installed a Nest doorbell. 3. The big job was their installing a nine camera security system on our home. Their work was excellent and are always ready to answer any questions before, during,...
Power Up Electrical Contractors, LLC
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Reviewed in January 2021
The installation of our Ring doorbell was very important to us and David was nothing short of professional, helpful, and knowledgeable. Our original doorbell was not compatible with our Ring doorbell and David spent all the time necessary to ensure it was properly installed. I highly recommend...
Handy Jack-The Home Improvement Pros
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Doorbell Installation questions, answered by experts

If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install blown-in insulation. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than $100. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.

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.

Vapor barriers in attics are a bit outdated and most areas no longer recommend them for attic spaces. For vented attics, the best method is usually to install drywall and cover it with latex paint before attaching insulation fiberglass, cellulose, or foam insulation. When renovating an attic to use as a living space, a contractor can guide you on the best way to cover insulation.

Ensures uniform application and maximizes insulation effectiveness and energy savings.

While not every wall requires a vapor barrier, if you do need one and don’t install it, moisture can get between the walls of your home. This can lead to water damage from mold growth or rot, and the excess moisture could also attract pests, including termites, cockroaches, or ants.

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