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 January 11, 2025

Reviewed in January 2025
My project was to install two microwaves. TJ is prompt, knowledgeable, courteous and neat. One of the microwave I bought was without the flush hinge. That prevented the door from opening full after it was installed. TJ patiently explained to me the kind that I need to buy and later that day...
TJ's Painting & Remodeling
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Reviewed in February 2024
Rapid installation. Respectful of clients. Knowledgeable of Ring products
Home Theatre Associates
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Reviewed in January 2024
From the appointment (which was right on time) to the installation was "top notch" I plan on having them back to complete the house. Selection and explanation of the product was very well done. I did get follow up calls while the windows were constructed to update me of the installation...
Clear Choice Home Improvements, LLC
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Reviewed in July 2022
Dennis did a great good installing our new garage door. Very happy!
Maietta and Sons, Inc.
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Reviewed in September 2021
We needed a subpanel installed to our electrical system and wiring extended into our garage for the installation of a Tesla wall charger. Wilfredo & Dennis did the job for Spirelli. They were prompt, polite, COVID-safe, and did a great job.
Spirelli Electric Inc
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Reviewed in July 2021
Dan Lamarche excellent installer especially since it A very difficult installation. Lovely finished job.
Newpro Operating, LLC
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Doorbell Installation questions, answered by experts

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

Ensures uniform application and maximizes insulation effectiveness and energy savings.

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.

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.

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

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