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>

Can you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</p></div>

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Last update on April 27, 2026

Reviewed in April 2026
Awesome experience. Completely shower install in one day. Courteous and trustworthy.
Mad City Windows & Baths
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Reviewed in November 2025
Andrew did a great job. He remodeled my whole living , kitchen, dining room. He installed all new windows, 1 front door with storm door.
Drew Pro Carpentry
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Reviewed in October 2025
Poor quality work and terrible customer service. They were unable to fix a leaking water line, and instead convinced us to replace entire system. Brady took vacation the day of the install, left behind two under qualified technicians who were on my property till 8:30 at night. Yard was...
Apple RIver Well and Pump Company
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Reviewed in December 2023
They were extremely prompt and very quick in installing my EV charging station. Every was left clean with clear documentation and instructions.
Richard Biechler Electric, LLC
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Reviewed in August 2022
Very pleased with installation. We are enjoying our new renovation and so happy we made the decision to have it done!
Bath Planet of Chicago
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Reviewed in February 2022
I had Imperial stone do quarts in my kitchen and two baths. After spending almost 8000 you would expect a quality job but that's not what I had received. What I did get was wrong cuts, seam where no seam was suppose to be and a broken sink that they broke that took two months to be replace....
Imperial Stone
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Reviewed in July 2021
I had Brian install a driveway at another house about 20 years ago I was a maverick when I chose colored concrete when nobody was doing it, it turned out better then I could have imagined and it looked new for the remaining 10 years that I lived there this time around I didnâ t really need a...
Kildare Concrete and Sons
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Reviewed in August 2020
Very positive experience with the windows being installed yesterday. Two guys were friendly good communication excellent work. Excellent service from initial estimate through Completion. Honest and very quick
Best Windows Inc
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Reviewed in May 2020
Sub-contractor installer was excellent. Mel’s Carpet Outlet sent same color carpet, but a lighter weight (less dense) with the installer than the one we picked out. And it was either measured wrong or cut wrong, because it was too short for the living room. And, when we questioned why they...
MEL'S Flooring Outlet
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Reviewed in October 2019
Cesar is outstanding! He did not repair or install my windows, he cleaned my windows.
HD Window Cleaning
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Doorbell Installation questions, answered by experts

The most affordable way to insulate a garage involves choosing cost-effective materials like fiberglass, which comes in batts or rolls and is relatively easy to install. You can often install this type of insulation without needing to add drywall, which helps reduce costs. While a DIY approach might seem cheapest, hiring a professional installer can be highly cost-effective. Experts can accurately determine your garage's specific insulation needs and ensure the best results for your investment, often using batt insulation for the bulk of the project.

Ensures uniform application and maximizes insulation effectiveness and energy savings.

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.

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.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

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