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 August 03, 2026

Reviewed in August 2026
Got a quote on Saturday and had everything installed on Monday! Very professional, great pricing, efficient work! Got everything done in a few hours and we were charging our new car as soon as they left!
ERDMANN BROTHERS ELECTRIC INC.
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Reviewed in May 2026
Kell installed a dog door. He had to cut through brick and concrete and I am very happy with how it turned out.
Cransten
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Reviewed in January 2026
We needed a Tesla charger installed in our garage. Ray responded promptly and was communicative throughout the entire process. He gave us the best price for the job and did it flawlessly.
TLC Solar and Electric
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Reviewed in July 2025
He help us installing a microwave and fan sealing and fixing one toilet Thanks
Pro Resolutions
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Reviewed in June 2025
We hired Weston to install can lights in three of the rooms in our house. He took the time to answer all our questions and was flexible with our schedule. He gave us a good deal and took the time to install a ceiling fan for us at no extra charge. Just a great guy who knew what he was doing!...
Electrical Pros
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Reviewed in November 2024
It was a Great experience to work with Cameron, he installed a doggie door for my home! He showed up on time, made sure he knew exactly what I wanted done before starting and then executed perfectly! Would definitely recommend, even hired him for another project!
Powerhouse Renovation LLC
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Reviewed in August 2024
installed shiplap in my home. they were very friendly and professional, finished job as scheduled. They cleaned up afterwards and my wall looks AMAZING
Remodelaholic, Inc.
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Reviewed in May 2024
My experience with this gutter installation was fantastic. The company is very professional and delivered high quality work.
Utah Rain Gutters
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Reviewed in April 2024
Fantastic to work with. Will definitely hire again. Installed a shiplap wall in bathroom. Turned out great! Is very reliable.
CANNON CUSTOM CONSTRUCTION
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Reviewed in October 2023
They showed up when they were scheduled to and responded to my telephone calls in a professional manner. The work was well done and a lot of my questions were answered during the installation.
Expert Water Systems, LLC
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Doorbell Installation questions, answered by experts

You don’t need to staple insulation, as your drywall and studs will hold it into place. But if you already have a staple gun and staples lying around, it can help keep the product in place and avoid any shifting. But, most experts agree it’s an unnecessary step.

If you’re adding a vapor barrier, you will need to staple that in place.

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.

Insulating your home's exterior walls can realize up to a 20% reduction in your monthly energy bills. This means that regardless of how much the project costs, it can begin to pay you back immediately. Additionally, adding spray foam and other high-end materials can increase the selling value of the property.

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.

Yes, usually you will need some kind of vapor barrier on the exterior walls when the framing is attached to concrete and masonry surfaces.

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