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 Norwalk, CA

*The Angi rating for Doorbell Installation companies in Norwalk, CA 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 Norwalk, CA 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 September 09, 2026

Reviewed in September 2026
Monty does excellent work. I needed a window AC installed which involved some custom fitting and mounting. I have a sliding window from left to right instead of up and down so to do a clean install was more involved than a traditional up down sliding window. I believe Monty went above and beyond...
Marco Montes
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Reviewed in September 2025
Great experience with this installer. Him and his crew were experienced and polite. No complaints about any of the requests I made they listened and got the job done. Haven’t had any issues since it was installed.
AUTHENTIC DOOR AND DOCK INC
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Reviewed in July 2025
I had TCI install 7 cameras and a video doorbell. Ivan and his team did an excellent job. The cameras look good, they showed me how to work them, they answered all my questions, they kept the worksite clean.
TCI Engineered Systems
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Reviewed in June 2025
Very professional. Explained me the whole installation process thoroughly and answered all my questions.
Anthony Christopher Mechanical Inc
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Reviewed in April 2024
Carlos was very nice and answered all my questions! We were happy with installation and the remote. Everything was done same day which was a huge plus! Would definitely recommend!!
Patriot Dock & Door, LLC
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Reviewed in August 2023
Job was done well. Very reasonable price for installation
Pachuco
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Reviewed in June 2023
The company needs to send the installers with quality connectors. The assumption the customer will get used to the whistling sound is very poor customer service. Installer Ben was amazing. He took time to find the correct part, did not Use the one that came with the unit.
Nuvia Water Technologies, Inc.
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Reviewed in December 2022
Prompt and courteous service. A pleasure to deal with Richard Glavas, as they installed two new sliding sreen doors. Very thorough and clean. Harold B.
Screen Me - Unlicensed Contractor
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Reviewed in July 2022
Excellent work. Same day installation, no issues, fair price.
Mattiace Electric
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Reviewed in December 2021
Randall did an excellent job installing my new shower doors. He was on-time and made me aware of the process along the way. His price was very good considering the excellent quality of work. He was also able to install some safety grab bars for me. I highly recommend!
Tru Grit Glass Company
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Doorbell Installation questions, answered by experts

The lifespan of crawl space insulation depends on how well you maintain your insulation and the type of insulation. Fiberglass will need replacing every 15 to 20 years on average if you don't have a vapor barrier in place. If you do have vapor barriers in place, then your insulation could last much longer. Spray foam insulation can last anywhere from 80 to 100 years.

When installing board and batten siding, make sure there is wall sheathing and a moisture-resistant barrier installed. Behind that sheathing should be plywood or OSB for you to nail the boards and battens into. If there isn’t plywood or OSB, you can install vertical furring strips at 1½- to 2-foot intervals to nail the boards and battens to.

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.

Spreading tin foil over your windows works similarly to radiant barrier insulation, but not as well. It will reflect some of the sunlight that would otherwise come through the glass and warm up the inside of your home, so it might help a little to keep your home cool in the summer. However, the appearance isn’t preferable to blinds or drapes that can offer the same benefits. You might also consider tinting your windows instead, which is a more aesthetically pleasing change that can still block a good portion of the solar heat coming through your windows.

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

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