Should you remove old insulation before adding new insulation?

• <div><p>You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.</p><p>However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.</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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Last update on April 18, 2025

Reviewed in April 2025
Christian was very prompt in answering any questions I had and he and his crew did a great job in removing my damaged old fence and installing a new vinyl fence. I would highly recommend
The Grecco Group LLC
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Reviewed in August 2024
Steve was the best! He Installed new light fixtures, hi hats, Outlets and switches, New circuit breakers, a separate high voltage panel for our mini split. And also gave us some beautiful outdoor lighting with spotlights up lights, new porch, lights, and driveway lights. Highly recommend At...
Home Team Wiring
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Reviewed in November 2023
Justin from JM Hoeing was excellent! A fair and honest contractor that met and exceeded all of my expectations. We have work with him on a few jobs and was always a pleasure to work with. Justin helped with land clearing for a new home, excavation for the foundation and septic system and...
JM Hoeing
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Reviewed in February 2023
Very professional install. Clean install. Answered questions promptly.
Hurricane Home Solutions, Inc.
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Reviewed in October 2022
Completed the work on time and within budget. I didn't get the buyers remorse that I had with other contractors. The quality of work to cost is exceptional. He also tiled the bathroom floor for 1/2 what others wanted. When I asked him if he could replace the toilet valve, Adam said,...
Home Recycling LLC
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Reviewed in June 2021
We had such a great experience working with Juan. He installed a drip irrigation and remote control system in our garden in the Catskills. He was professional and knowledgeable. He showed up on time and was always available with any questions. His prices were very reasonable and overall he...
Affordable Irrigation
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Reviewed in October 2020
Ryan came right out to install the electric fence . Gave best price to do it. Was fast and knowledgeable. Good with my dogs . Would highly recommend this local business. Overall great experience.
American Pet Containment, LLC
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Reviewed in October 2020
Andrew was a great guy install was smooth. Hire again for other work.
A. Simmons Electrical Services
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Reviewed in August 2020
Install motion sensor light switches
Top Electrical Service LLC
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Reviewed in October 2019
I was 1200 miles away. They were quick to educate me of the quality that was needed. Blueprint of house and what they were going to install. They sent me pictures of final project when completed. Then billed me for project. Very professional!!!
The Gutter Guys
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Doorbell Installation questions, answered by experts

You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.

However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing 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.

Reflective and high R-value batt or roll insulation are often considered energy-efficient, offering significant thermal resistance benefits.

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