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>

Does basement insulation need a vapor barrier?

• <div><p>Yes, basement insulation needs a vapor barrier due to its susceptibility to moisture seeping in from the outside of the house. You should install a moisture barrier before you <a href="https://www.angi.com/articles/how-to-install-insulation.htm">install insulation</a> or purchase insulation that comes prebuilt with a moisture barrier to avoid water damage in your insulation and costly mold and water remediation expenses. </p><p> </p></div>

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Last update on July 04, 2025

Reviewed in July 2025
I had a number of interior doors that needed work - some needed the bottoms shaved, one needed the side shaved, and the biggest project was replacing these ancient, horrible metal doors that were a weird size. They had to resize the utility closet opening before installing new doors. I'm super...
Arkwright Handyman
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Reviewed in February 2025
The installers are great, fast and efficient l recommend.
DJ Rury Carpets Corp
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Reviewed in October 2024
Good communication before and after installation of storm door. Did an excellent job. Would hire again.
Booher Construction Company
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Reviewed in August 2023
We got what we wanteld at a very good price. It only took 1 day. Installer was very professional
Mad City Windows & Baths
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Reviewed in September 2022
The installers were professional polite informative and very efficient I would use bath planet again
Bath Planet of Springfield
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Reviewed in August 2022
Greg Frantz does excellent work and the results were beautiful. He is dependable, responsible, and was on time. I have scheduled him to do additional work including building and installing a barn door. I would definitly hire him in the future.
Greg Frantz Remodeling
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Reviewed in September 2021
Really quick phone response. Fast visit with estimate. Install done within 4 days. Great work. Only took 3 hours, including removal of old gutters.
Evan & Felicia Davis Construction
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Reviewed in July 2021
Mike Schuler was absolutely wonderful to work with! Mike is the guy for the job if you want expertise, craftsmanship and a dose of troubleshooting. He installed three doors all with different challenges that were handled with care. I will have Mike do anything else to my home that is necessary ....
DoorsWellhung.Pro
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Reviewed in June 2021
Associates of this company are very friendly and knowledgeable. They installed a new exterior door for me. I am very pleased with their work.
SkeBo Rae Homes
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Doorbell Installation questions, answered by experts

The cost to install or upgrade insulation generally ranges from $1.50 to $4.00 per square foot. The final price depends on factors such as the type of insulation chosen, the total area to be covered (home size), and local labor costs.

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.

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.

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.

Yes, basement insulation needs a vapor barrier due to its susceptibility to moisture seeping in from the outside of the house. You should install a moisture barrier before you install insulation or purchase insulation that comes prebuilt with a moisture barrier to avoid water damage in your insulation and costly mold and water remediation expenses.

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