Should I remove old attic insulation before adding new?

• <div><p>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: </p><ul><li><p>If the insulation is over 15 years old</p></li><li><p>If the insulation is wet or moldy</p></li><li><p>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></p></li><li><p>If you see signs of pest infestation</p></li></ul><p>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</p></div>

Do insulation companies need to be licensed?

• <div><p>In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s <a href="https://www.angi.com/angi-license-check.htm">license lookup tool</a> to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.</p></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 FAQs, 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.

For standard 2x4 walls, the ideal insulation has an R-value between R-13 and R-15. This level of insulation, typically around 3.5 inches thick, fits well within the wall cavity. Common options include fiberglass batts and spray foam. The best choice for your home can depend on your climate; use R-value maps, like those from Energy Star, to determine the recommended level for your region. For colder climates, you might also consider adding exterior insulation for greater efficiency. Always check with your local building codes to ensure you meet any required standards.

Ductwork should be wrapped in insulation in certain locations. This includes unconditioned interior parts of the home, such as attics, crawl spaces, basement ceilings, and between floors. Duct joints should also be insulated since they're more likely to leak air than other parts of your system. Building codes in some areas also require ductwork to be insulated.

In some areas, insulation companies require a special license, while some states only require them to hold general contractor licenses. Some municipalities may not mandate any license, although you should always ensure a contractor is fully insured. You can use Angi’s license lookup tool to confirm whether or not an insulation contractor you’re considering holds the necessary license for your area. You can also contact the company for information regarding licenses, certifications, and insurance.

Insulation is professionally installed by measuring spaces, cutting materials to fit correctly, and placing them without gaps for optimal thermal resistance.

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