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 Dublin, OH 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 Dublin, OH 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 October 13, 2025

Reviewed in October 2025
Great experience! I hired them to install a door, and they did an excellent job. The installation was done professionally, and they were able to fit me into their schedule very quickly.
Yeager Home Improvement
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Reviewed in August 2024
The installation was perfect. Thank you!
Mad City Windows & Baths
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Reviewed in May 2024
Hired M&T Carpentry, LLC to install mailbox. They responded quickly to my message. Then arrived early and completed the installation a day ahead of schedule due to opening in their schedule. Very professional, timely, and and good value / price for the project.
M&T Carpentry, LLC
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Reviewed in February 2024
I highly recommend Brian for any electrical repair needs. He is very responsive and arrived within the planned 30 minute window. He really knows his stuff! He carefully analyzed each issue: non-working outside lights, non-working doorbell, and a light switch that needed to be replaced. He...
BNV Electric
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Reviewed in March 2023
Responded quickly to my initial contact. John replaced the overhead door motor, installed a new outside keypad, infrared door sensor. Expert installation. Friendly and very easy to work with.
Buckeye Overhead Doors, LLC
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Reviewed in March 2022
Apex installed a garage door opener.
Apex Garage Door Services
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Reviewed in January 2022
Installed a storm door. Very professional. Cleaned up and door works perfectly.
Green Arrow Energy Solutions
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Reviewed in November 2021
Arrival was prompt and on time as promised. The tech was friendly and professional. He knew exactly what I wanted and got straight to work. The new vanity lights were installed, switches changed out and a Ring doorbell installed. Finished quicker than I expected. Good cost too.
Accurate Electric Construction, Inc.
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Reviewed in September 2021
Because they did the estimate alone, we were not present, so there were some misunderstanding of what needed to be done. Wished they had rung the doorbell when they came. Over all, it went OK.
E&L lawn care
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Reviewed in November 2020
Originally needed electrical work done to run 2 external outlets and run new power line for a smart doorbell. Several other contractors I had out did not want to wire the doorbell because they thought it would be too hard as it had not been pre-wired during construction. This did not seem to be...
Polar Air
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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.

Periodic checks for moisture or pest issues ensure consistent performance.

Insulation can be easy to install, depending on the condition of your walls, but there are many safety considerations and potential challenges involved. For example, most types of insulation are made from materials that can cause irritation if inhaled or if they come into contact with your skin. Additionally, installing insulation incorrectly can actually make moisture issues in your home worse.

Fiberglass is the best insulation for HVAC ducting because it's inexpensive, widely available, versatile, and long-lasting. Fiberglass also offers acoustic insulation in addition to thermal insulation, which can contribute to a more peaceful home environment. You can use other materials like mineral wool, but fiberglass is the industry standard.

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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