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>

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>

How do I choose the right type of insulation?

• <div><p>Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you <a href="https://www.angi.com/articles/r-you-using-right-type-home-insulation.htm">choose the right insulation</a>. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.</p></div>

Does bathroom insulation need a vapor barrier?

• <div><p>Yes. Bathroom insulation requires a vapor barrier. As a matter of fact, bathrooms and kitchens are the two areas of the home that should always get a vapor barrier because of the excess moisture. If you don’t have a vapor barrier in place in these rooms, the moisture will build up and eventually lead to mold and bacteria, not to mention the destruction of the insulation.</p></div>

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Last update on January 24, 2026

Reviewed in January 2026
Dude and Crew did a great job , less than 2 hours , they installed a kit for my generator to connect to the House during power outages. It looks professional , neat and well done. I am a happy camper.
J & J Electric LLC
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Reviewed in June 2023
Very professional company did a great job on the install very easy to work with
SSC HEATING & AC LLC
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Reviewed in July 2021
They did a great job on the install of my french drains and even worked with me on different solutions that didn’t require me to go through my HOA.
New Ground Services, LLC
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Reviewed in October 2019
Very prompt response. Workers removed old windows and installed new in a single day.
Tubbs By Grubbs
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Reviewed in June 2019
Richard installed carpet throughout house(4 bed rooms), Tiled shower, and pressure washed concrete. He did a great job, was timely, flexible and both him and his helper were trustworthy.
Proctors Restoration
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Reviewed in September 2018
Very nice hard working gentlemen. I'm hiring them to install my front yard plants.
Love Your Lawn
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Reviewed in April 2018
The installation crew was very efficient and went to the extra effort to cover a couple of holes in the floor of the attic. They were very pleasant to work with. I will be calling them in the future.
Spray Master, LLC
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Reviewed in September 2017
I hired them yesterday to install an egress window which will be approximately 8 feet under ground...the work will start in several weeks, after permits obtained. John the sales person is very knowledgeable and really cared about not only earning my business, but also making sure my questions...
AquaGuard Waterproofing Corporation
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Reviewed in August 2017
I have rental property in New Orleans and hired Mike with RH & MS, LLC. They redid the entire house with Hardi siding, installed a new front door and framed all windows, painted, installed new lighting as well. RH & MS ( Mr Mike) conducts their business like it is a business. He does what he...
RH & MS, LLC
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Doorbell Installation FAQs, answered by experts

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, professionals can add extra insulation or backing for enhanced sound control.

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.

Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you choose the right insulation. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.

Yes. Bathroom insulation requires a vapor barrier. As a matter of fact, bathrooms and kitchens are the two areas of the home that should always get a vapor barrier because of the excess moisture. If you don’t have a vapor barrier in place in these rooms, the moisture will build up and eventually lead to mold and bacteria, not to mention the destruction of the insulation.

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