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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*The Angi rating for Doorbell Installation companies in Whitefish, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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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 LLC
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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

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.

It is usually possible to install insulation yourself, but it’s often better to hire an insulation professional. An experienced insulation pro can determine which type of insulation is best for your space and the R-value get the most value and comfort in your home. Certain types of insulation can cause skin, eye, and lung irritation, and a professional will have the equipment necessary to keep themselves safe and limit the effect on your indoor air quality after the installation. Certain types of insulation—like blown-in and loose-fill insulation—demand a professional for proper functionality and safe installation.

One of the clearest signs that your insulation isn’t working as well as it should be is a noticeable difference in temperature throughout your home. One room might feel icy while another is hot as Arizona—this indicates that some parts of your home are either retaining or losing heat more than others. Additionally, a sudden increase in your energy bills, evidence of pests or rodents, or evident water damage are other signals that warrant a thorough inspection of your insulation and potential replacement.

Doubling the insulation in your home also doubles the R-value of said insulation. In other words, by adding more insulation, you can reduce the heat loss by half. Most homes benefit from increasing insulation. Older homes, in particular tend to have less insulation as is, so doubling your insulation could drastically reduce your energy bills, keep your home more comfortable, and take the strain off your HVAC system.

Costs depend on area size, material thickness, and site preparation needs.

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