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>

How do I add insulation to existing walls?

• <div><p>If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install <a href="https://www.angi.com/articles/blown-in-insulation.htm">blown-in insulation</a>. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than <b>$100</b>. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.</p></div>

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Last update on March 20, 2026

Reviewed in March 2026
Thank you Paul for assisting me with my new flooring purchase and install of 3AQUACORE XL 9"X72"X8MM EIR. As I am aware this flooring is made for Busenbark. My installer was a 10+ and great to work with. He installed Living Room, Dining Room and bathrooms. He was careful with items in the home...
Busenbark Carpet Inc
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Reviewed in January 2026
Randy and crew arrived and installed new storm door and front door on front of house. They also installed new French doors in place of our old sliding glass doors downstairs. Loved the work.
Power 2 Construction & Remodeling
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Reviewed in April 2025
Gaven did excellent work installing an aluminum railing and a new set of stairs for my deck.
Bell's Carpentry & Construction
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Reviewed in February 2025
I hired Mr. Bell to install some kitchen cabinets at my cabin on the lake. He very professional and his workmanship is top notch. Showed up on time and his installation price was more than fair. Definitely would hire him again.
Bell's TrimWork
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Reviewed in June 2023
Ethan Crocker and crew have done repairs and complete roof installation on two different storm damages in two years. If quality, integrity,work ethic, and good communication are important to you, you need look no farther. I will recommend to all my family and friends.
Direct Contractors, LLC
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Reviewed in July 2021
The crew did an excellent job. I was highly satisfied with the septic system they installed and the clean up that followed. I highly recommend this company. Bill Boyd
Ross Contractors LLC
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Reviewed in June 2021
Easy to work with and Did a great installing our new door.
Elite Overhead Doors, LLC
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Reviewed in June 2021
Our sales person Kirk was extremely knowledgeable and even went over ways that we could combine two windows into one in order to save money on our large project.. This suggestion actually created an impressive look that both my husband and I LOVE and havenâ t stopped commenting on since the...
Universal Windows Direct of St Louis
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Reviewed in June 2020
Had a bathroom install in basement. I got a competitive bid, quick start time, and they listened to what I wanted and did it well! He also responded well to email or text and was easy to communicate with. I would defitely hire them again for remodeling projects in the future!
Grace Renovations, LLC
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Reviewed in May 2020
Not only did he install my microwave but he also removed a rose bush that I needed removed!
Cooper's Handyman Services, LLC
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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.

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.

Through R-value assessments based on climate and existing insulation.

Mineral wool wraps are the most affordable and effective insulation for crawl space ducts. They are easy to cut, last for a long time, and healthier for humans. Meanwhile, fiberglass wraps are cheaper but more hazardous and difficult to handle. If you do choose to use a fiberglass wrap, make sure you are wearing long sleeves and wear proper protective gear.

If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install blown-in insulation. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than $100. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.

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