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 Cabool, MO 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 April 30, 2026

Reviewed in April 2026
They did a wonderful job installing our generator. They were very professional. They always returned phone calls and emails. I highly recommend their services.
RON'S ELECTRICAL
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Reviewed in July 2017
As soon as I clicked on "get a quote", Mike Davis was calling me. He and his wife Beverly came out in less than 2 hours, assessed the issue, went and got the parts and had the outlet installed on the outside of the house the same day. Would highly recommend them, down to earth, pleasant and...
Davis Electric
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Reviewed in August 2016
I have used Dotson Excavating several times over the past five years and have been extremely satisfied with the results from every project. I have had them install retaining walls to redirect rain runoff, grade large areas and remove trees to facilitate large landscaping projects,...
Dotson Excavating
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Reviewed in February 2016
They went above and beyond. Had many helpful suggestions in the planning stage. Did a great job installing the wiring. Great team. Good follow up. 
JJP Electric
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Reviewed in December 2014
Walt came to assess a leaky water heater problem. He determined that it was irreparable and that a new one was in order. He sold us a new one, installed it and hauled the old one away. He was very courteous and punctual and his work was tidy. If I have any plumbing troubles I will certainly...
WALT'S PLUMBING
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Reviewed in February 2014
The owner was very informative about what I would need to do, what products he used, and approximate cost of services without a onsite visit. Stated he had experience in this type of installation. I decided to do more research into my house needs, and did not contact this company back.
Heritage Plumbing
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Reviewed in July 2013
Install went fine We have since tried to call him for filters,/service. He had NOT returned phone calls! He refuses to do service! Only new install 
Affordable Heating & Cooling
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Reviewed in March 2013
The work started on time and finished on time. There were no problems throughout the installation. 
Elite Aire LLC
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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.

Through R-value assessments based on climate and existing insulation.

Minimal maintenance is required, though regular inspections to ensure insulation hasn't shifted or deteriorated can improve performance over time.

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.

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.

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