Should I remove old attic insulation before adding new?

• <div>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: <ul><li>If the insulation is over 15 years old</li><li>If the insulation is wet or moldy</li><li>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></li><li>If you see signs of pest infestation</li></ul>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</div>

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Last update on June 10, 2025

Reviewed in June 2025
Opportunity Construction will always be my #1 company to go to for my fencing needs. Here's the reason why. First, from start to finish, Dean Currow was very knowledgeable about installation of fencing. He displayed great customer service, professionalism, attention to details, and was so easy...
Opportunity Construction
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Reviewed in July 2024
Ransom installed a deer fence around my garden, and it's exactly what I wanted and need. Pleased with the work, as well as the timing, as I've got my garden protected early enough to harvest before the deer do!
Ransom
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Reviewed in June 2023
Working with NW Gutter Guards and especially Andrew was a dream. Carson and team are responsive and do what they say they are going to do. Andrew came and gave an estimate, did the work from start to finish. He communicated well and was a professional and wonderful person to work with. I love...
NW Gutter Guards, LLC
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Reviewed in May 2023
Excellent service and quality work. Adam responded promptly to my request for service. Within one week he had our garage door openers to our garage/barn installed and operational. They work perfectly. Highly recommend.
Battle Born GDC, LLC
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Reviewed in January 2023
RBA has wonderful installers - very professional, courteous and efficient. In addition, they left our home spotless. We had several windows installed and our home is now soundproof to outside traffic and is warmer this winter. The view outside is much clearer as well. We highly recommend RBA.
Renewal by Andersen of Montana
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Reviewed in November 2022
Great communication skills and a quick turnaround from the point they measured to the point of installation!
Montana Stone Fabricators, Inc.
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Reviewed in October 2022
Ken and Adam were excellent. They picked up and installed new dishwasher. A+++
J&J Property Services, LLC
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Reviewed in July 2021
During the recent heatwave, we had no cool air. We left a voicemail with Adam and within 24 hours, we had cool air. He also repaired a few problems that have been present since installation. Adam is very professional, knowledgeable, and friendly. We would highly recommend him to anyone.
Grizzly Air
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Reviewed in July 2019
Was quick to reply and install a solar heat exhaust fan on my roof. Cleaned up all the debris and was done in a few hours.
Fabricor
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Reviewed in March 2018
He did a new install at my new construction home 3 1/2 years ago. He did the full design, he did a great job of variety and listened to what I wanted including for patio layout. If there were any issues with plants he replaced them.
Montana Gardens, Inc.
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Doorbell Installation questions, answered by experts

Spreading tin foil over your windows works similarly to radiant barrier insulation, but not as well. It will reflect some of the sunlight that would otherwise come through the glass and warm up the inside of your home, so it might help a little to keep your home cool in the summer. However, the appearance isn’t preferable to blinds or drapes that can offer the same benefits. You might also consider tinting your windows instead, which is a more aesthetically pleasing change that can still block a good portion of the solar heat coming through your windows.

Each of the three types of wool insulation has particular disadvantages. While their R-value is higher, they all cost more than fiberglass versions. Installing mineral wool and sheep wool requires protective gear. Because of its vulnerability to insects, chemicals are used in its production. Hemp wool is more costly to install than other types because additional tools and labor are involved.

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, they address underlying issues, providing long-term seals and energy savings you might need help to achieve.

The life span of insulation is between 20 and 100 years. At that time, existing insulation can fall victim to gravity, resulting in compression, which reduces its insulating protection or R-value. If you can't simply add more insulation over the existing material, removing the old to increase the effectiveness of the new can reduce your energy bills and make the project worth the time and money investment.

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