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 Mclean, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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

Last update on November 03, 2025

Reviewed in November 2025
Great craftsmanship by this crew. They installed a new front porch for our old house. A few tweaks were easily incorporated, and they offered some unique ideas as we communicated our vision. We look forward to working with them again.
Werkman Builders
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Reviewed in April 2024
The installers were prompt and very professional. The Spray Foam around the rim joists in the basement and crawl space took care of the issue I was having with feeling air around the upper floors.
Home Comfort, Inc.
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Reviewed in January 2024
This company is top notch. The rates are super competitive and the customer service is excellent. The installation went very smoothly. Youâ d be silly not to contact these fine folks.
Betsworth Mechanical LLC
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Reviewed in October 2022
Love my new walk-in shower. Installers knew what they were doing. They explained the process & asked where I wanted some optional features. They cleaned up when they left.
Bath Planet of Rochester
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Reviewed in July 2022
The installer showed up on time and explained the process as he went along. He was very professional and friendly. Loved how it turned out. Will consider for future projects.
Bath Planet of Peoria
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Reviewed in October 2021
They installed a skylight and did a great job! Very good communication and showed up on time. Very clean and considerate in our house. Paid attention to details and the skylight is beautiful!
A & E Roofing & Construction PLLC
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Reviewed in April 2021
Communication was great, installation was fast and done well. Would definitely hire again!
Illinois Gutter Solutions
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Reviewed in October 2020
Quickly responded to my query for a quote. Then on time, on budget and installed like a true professional.
Blasen garage door company LLC
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Doorbell Installation questions, answered by experts

It is generally completed in a day, depending on the attic size and access difficulty.

Insulating windows without plastic is usually the better method. Outside of simply replacing your windows, you could buy cellular shades, which trap air between the window and the home, add a window film that blocks UV rays and traps heat, or cover your windows with a low-emissivity coating called “low-E.”

While fiberglass is dangerous to work with, it’s a perfectly safe material once it’s installed. If you’re tackling the installation yourself, make sure you take the proper safety precautions and wear the right gear to avoid skin and eye irritation and lung complications. Working with a professional insulation company can mitigate these risks.

Experts use advanced techniques and tools to assess existing insulation levels and identify gaps. They implement strategic placement of new insulation to ensure complete coverage, optimizing thermal resistance and energy efficiency.

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.

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