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>

Can you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</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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Verified Reviews for Doorbell Installation pros in Sonoma, CA

*The Angi rating for Doorbell Installation companies in Sonoma, 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 Sonoma, 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 January 23, 2026

Reviewed in January 2026
Skillz did beautiful work installing new floors. I could not be happier.
Skillz Construction, Inc.
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Reviewed in November 2025
The installation process was amazing. We walked the site, which involved two different types of fencing and several gates. The installer understood my concerns and he asked questions. Best of all, they were done in just a few hours! Highly recommended!
Ergeon
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Reviewed in January 2025
Did a great job installing new Ring Doorbell including reconfiguring setup in the cellphone application. Works great after a previously failed attempt by a different electrician.
Pro City Electric, Inc.
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Reviewed in November 2024
Chris and Gary were professional, prompt, and reasonable. The garage door was installed as discussed. I paid half down (to purchase garage door) and other half upon completion. Gary the installer was courteous, efficient and pleasant person. Thank you gentleman. Paul Borg
Superior Garage Door Service
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Reviewed in March 2024
I had several quotes from others, Haney was the best price and dealing with the project manager and install technician was excellent! I would definitely recommend them to anyone!
Haney Door Service, Inc.
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Reviewed in September 2022
Great communication, perfect solution for our level 2 EV charger install. On time and great execution in terms of quality, thoroughness and speed. Would always use Aaron Murphy again!
Aaron Murphy Electric
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Reviewed in September 2022
Walt came out on Labor Day weekend to install a new lock set in front entrance door. The old one was probably original to our over-100-year old house and had finally fallen off! It was tricky dealing with hardware that was sized very differently back then. But, he got it done! Thanks.
Walt's Mobile Locksmith
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Reviewed in October 2021
Excellent installation. I would definitely recommend him.
Frank's Water Heater Company
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Reviewed in July 2021
Super helpful and nice. Installer was quick, and did a better job than the guy who installed the last dishwasher in this house
All Pro Appliance Installation, Inc.
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Reviewed in February 2021
Matt installed our generator for us. We were very happy with his service.
Gendron Electric
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Doorbell Installation questions, answered by experts

Yes, professionals can add extra insulation or backing for enhanced sound control.

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.

Mineral wool has an excellent life expectancy of up to 50 years, provided it's kept dry and free of pests. Compared to fiberglass, with a life span of 20 to 30 years, mineral wool stacks up well for long-term cost savings. Sheep wool maintains a similar life span to fiberglass, while estimates for hemp wool insulation life expectancies are all over the board, ranging anywhere from 20 to 100 years.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

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.

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