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 Oakhurst, CA 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 Oakhurst, CA 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 July 18, 2026

Reviewed in July 2026
Francisco did a very nice job installing flooring leveling the floor first, baseboards snd and eood flooring wall, will deginitely hire him again.
Francisco Javier Rodriguez Arangure
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Reviewed in July 2025
Jessica and Mark are my go-to plumbing service no matter the scale of my project. I hired them to replace my water heater and install a new one as well as unclog a drain. In both jobs, they were professional, communicative, punctual, and so easy to work with. I appreciate how they were able to...
Sierra Line Plumbing
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Reviewed in December 2023
It's been over a year and the system is operating like a champ. The app is awesome and our PG&E True-up was negative. Before we met with any companies, we spent dozens of hours researching panels and micro-inverters, and decided we were leaning toward Sunpower solar panels and Enphase micro...
SunMade Energy
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Reviewed in July 2022
Windows were not what I expected and installation had to be completely redone. I will not use it again.
Sears Home Improvements - Windows
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Reviewed in August 2020
Best service provider of all time! They did a next day appointment to troubleshoot my AC and install smart thermostats. Santos, our technician arrived on time, wearing a mask and foot protectors. Fixed the AC issue and installed the thermostats perfectly. Cleaned up the drywall dust and verified...
Energy Smart Engineering, Inc.
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Reviewed in April 2020
DO NOT HIRE! This person was a waste of time and money and I cannot caution others strongly enough to keep them out of your home. He was completely unprofessional with no time management skills, zero respect for other people’s time, and the quality of his work was terrible. If you haven’t...
Funky Monkey Fix It Service
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Reviewed in March 2020
I needed an electrician for a very small job and Cornett lighting answered my call right away. Eli (owner) showed up and installed and completed the job. Not only did he complete the electrical part but also added some other nice touches to the job. He is VERY professional and VERY fair...
All Starr Electric and Solar, LLC
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Reviewed in January 2020
I thought $100.00 to program our car to the new opener was excessive. This has been done previously by other companies as a no charge courtesy. It took the installer one minute to do it.
Precision Overhead Garage Door Service
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Reviewed in November 2019
I hired Tyson Hatch owner of TLH Hardwoods, LLC through HomeAdvisor to install a wood floor in a home that we had recently purchased. His quote was just pennies higher than the lowest quote we found on our own and his work ethics along with his professionalism were beyond belief. He came to give...
TLH Hardwoods, LLC
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Reviewed in September 2018
Mitch and his team gave me a solid high-quality product for a fair price. The owner of the company personally followed up with me and answered all of my questions. The team did the install in one day and the results were amazing. I highly recommend Turf Exchange!
Turf Exchange
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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.

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.

Periodic checks for moisture or pest issues ensure consistent performance.

The life span of fiberglass insulation can be as long as 80 to 100 years, but because of changing building codes, it’s best to get your insulation checked every 10 to 15 years. Signs of degrading fiberglass insulation include bits of batts on the floor or batts detached from frames. Having optimal, healthy insulation in your home will improve its energy efficiency, lowering your monthly bills.

A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.

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