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>

Should I remove old attic insulation before adding new?

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

Should wall insulation be faced or unfaced?

• <div><p>Unfaced wall insulation is easier to cut and install, making it the better choice for a DIY project. It’s also more affordable. But if it’s unfaced, you’ll likely need to add a vapor barrier to reach your desired R-value and efficiency, as it doesn’t offer any moisture barrier.</p><p>Faced insulation uses paper or foil to create a built-in barrier and doesn’t require an extra step. It’s also more fire-resistant and safe. But it’s quite a bit more expensive and a little bit harder to work with as a DIYer.</p></div>

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Last update on March 20, 2026

Reviewed in March 2026
Turf was installed perfectly 3 years ago still looks new! Just went back today to purchase rock. Good selection, was loaded quick. Great polite staff!
Guzman Creative Turf
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Reviewed in September 2025
We highly recommend Affordable Fence & Gates for your fencing needs. We had a custom security door made and installed. Rick, came out to help us create the perfect design for us, including a silhouette of our Labrador on the door and was very knowledgable and helpful with the design. The...
Affordable Fence and Gate
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Reviewed in May 2025
I needed a door installed in my bathroom and these guys came and busted it down super fast!!! 100 % would work with these guys again.
Handyman Plus
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Reviewed in March 2025
To be clear: your selection did not have the right option. He installed a heavy duty underground power line from the electrical company polled to my house. They did a quick and thorough job at a good price.
Barker Electric Company, LLC
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Reviewed in March 2025
I was referred by a family member to Alcantar construction by the amazing concrete work they did at their home. I was interested in removing an old glass patio door and to have a new window installed in my son’s room. Rodrigo and his team said it would not be a problem and were able to take on...
Alcantar Construction
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Reviewed in January 2025
Arturo installed all of our kitchen cabinet handles and knobs. He was very patient throughout. He did a great job and definitely, will be hiring him again.
Arthur Maintenance Service - Unlicensed Contractor
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Reviewed in May 2024
Excellent communication. Will utilize this company again. Updated panel and installed electrical car charger with no problems. Mr. Broker was in constant communication and took care of everything.
Executive Suites Development, Inc.
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Reviewed in February 2024
They took care of the install They were very professional and very professional I'm pretty satisfied with them highly recommended
Advanced Technology Ventures, Inc.
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Reviewed in November 2023
Really thorough consultation, communication from beginning to completion of installation was very Good.
SunMade Energy
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Reviewed in July 2022
You can’t go wrong Hiring Orrlando and his partner to do any repairs around your home or business. They came to my home this morning and completed every thing that I asked for them to do, from installing several ceiling fans, doing electrical work, installing a microwave, and repairing my...
Orrlando Rosalez Construction
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Doorbell Installation questions, answered by experts

Through R-value assessments based on climate and existing insulation.

In addition to adding insulation to your attic, you may want to add a radiant barrier. A radiant barrier works by using reflective material, such as foil, on the attic floor. As heat penetrates the roof and enters the attic, the radiant barrier reflects the heat upward and back through the roof. If you receive a lot of direct sunlight on the roof, using both a radiant barrier and insulation in your attic can provide significant benefits.

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.

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.

Unfaced wall insulation is easier to cut and install, making it the better choice for a DIY project. It’s also more affordable. But if it’s unfaced, you’ll likely need to add a vapor barrier to reach your desired R-value and efficiency, as it doesn’t offer any moisture barrier.

Faced insulation uses paper or foil to create a built-in barrier and doesn’t require an extra step. It’s also more fire-resistant and safe. But it’s quite a bit more expensive and a little bit harder to work with as a DIYer.

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