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>

What are the four common types of insulation?

• <div><p>While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.</p></div>

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Last update on January 23, 2026

Reviewed in January 2026
Skillz did beautiful work installing new floors. I could not be happier.
Skillz Construction, Inc.
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Reviewed in November 2025
The installation process was amazing. We walked the site, which involved two different types of fencing and several gates. The installer understood my concerns and he asked questions. Best of all, they were done in just a few hours! Highly recommended!
Ergeon
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Reviewed in January 2025
Did a great job installing new Ring Doorbell including reconfiguring setup in the cellphone application. Works great after a previously failed attempt by a different electrician.
Pro City Electric, Inc.
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Reviewed in November 2024
Chris and Gary were professional, prompt, and reasonable. The garage door was installed as discussed. I paid half down (to purchase garage door) and other half upon completion. Gary the installer was courteous, efficient and pleasant person. Thank you gentleman. Paul Borg
Superior Garage Door Service
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Reviewed in March 2024
I had several quotes from others, Haney was the best price and dealing with the project manager and install technician was excellent! I would definitely recommend them to anyone!
Haney Door Service, Inc.
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Reviewed in September 2022
Great communication, perfect solution for our level 2 EV charger install. On time and great execution in terms of quality, thoroughness and speed. Would always use Aaron Murphy again!
Aaron Murphy Electric
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Reviewed in September 2022
Walt came out on Labor Day weekend to install a new lock set in front entrance door. The old one was probably original to our over-100-year old house and had finally fallen off! It was tricky dealing with hardware that was sized very differently back then. But, he got it done! Thanks.
Walt's Mobile Locksmith
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Reviewed in October 2021
Excellent installation. I would definitely recommend him.
Frank's Water Heater Company
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Reviewed in July 2021
Super helpful and nice. Installer was quick, and did a better job than the guy who installed the last dishwasher in this house
All Pro Appliance Installation, Inc.
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Reviewed in February 2021
Matt installed our generator for us. We were very happy with his service.
Gendron Electric
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Doorbell Installation questions, answered by experts

Installing sheets of plywood over attic insulation is a popular choice, especially in storage spaces. That said, insulation works by trapping hot air—so it needs extra space to expand and be effective, or you might reduce the energy efficiency of your home.

It’s important that you never compress the insulation by installing flooring directly on top of it. In many houses, you’ll need to install a subfloor before putting plywood over insulation in your attic.

Improves water efficiency, reduces oversight, and enhances landscape health.

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.

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

While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.

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