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>

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 February 05, 2026

Reviewed in February 2026
the people were nice and did not pressure me to purchase. work was done as expected and this company "took all the time in the world" to talk with me on the phone to get set up with financing. so far the products I had installed are doing OK.
Rogers Heating And Cooling
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Reviewed in October 2025
This company was amazing from beginning to end. I just moved into the house and needed some work done as per the inspection. I had outlets and switches that didn’t work, wires in the attic that weren’t covered, replaced a bathroom fan, added a light above the shower and changed the location of...
Bobcat Electric LLC
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Reviewed in May 2025
Very professional and quick!! Chris was very helpful and explained everything. Installation was quick and done by Chris, Eric, and Brad
Tilley's HVAC Mechanical Services
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Reviewed in September 2024
I had a problem with my shower not shutting off and got in touch with Mitchell. He came right out and it turned into a bigger job than we expected as it is an older house. He stayed until the job was finished. He had to install new lines as the old originals were soldered together. He did a...
Mitchell's Handyman Services
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Reviewed in July 2024
I've been having Johnston Cooling and Heating maintain my original Heat pump and air handler so when I needed to replace it I had no hesitation to gave them do it. Even though Jason and his assistant Sheldon showed up later than what the scheduled installation time was, which I totally...
Johnston Cooling and Heating, LLC
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Reviewed in January 2024
Don is a very passionate person about his work and it shows !! While doing my bathroom, he would explain anything to me that I wanted to know which meant a lot to me Ã Â Ã Â°Ã Â Ã Â Ã Â Ã Â Ã Â Ã Â He did my install on my standup shower in a timely manner , but saying that he did not rush...
Don's Improvement's, LLC
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Reviewed in June 2023
Jack Garst was very professional and gave me ideas. The lift works great, and I'd recommend his company. The workers were able to install the lift and work around the laundry sink that could have been in the way. The only flaw that I see is a way to hold the gate so it doesn't fly back too...
EZ Mobility Solutions
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Reviewed in September 2022
Maurice provided excellent customer service. I needed a water softner installed. He was very professional and made sure to clean up the work area before he left.
Valley Plumbing
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Reviewed in May 2022
Great job installing compressor and other parts on heat pump. Also checked air handler.
Apex Mechanical
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Reviewed in October 2021
prompt professional very experienced. knew we needed a outdoor shutoff and was installing it before my husband remembered to tell him.
Bob's Electrical Service & Repair
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Doorbell Installation questions, answered by experts

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

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.

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.

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.

Yes. Proper, complete insulation will ensure that you trap the most cool or warm air inside your home, preventing high energy bills. In addition, insulation tends to settle and compress, leaving gaps over time; the more you insulate completely during the initial installation, the less you’ll need to do down the line.

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