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>

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*The Angi rating for Doorbell Installation companies in Occidental, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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Last update on June 11, 2026

Reviewed in June 2026
Received quote to install a metal fence gate. Quick response, Dayne was very responsive and polite. Appreciate that.
Ergeon
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Reviewed in November 2025
I had 2 ceiling fan/lights installed in the bedrooms. Installation included 2 new circular circuit boxes in each bedroom ceiling. In addition, I replaced the kitchen ceiling light with an LED fixture. The 2 workers were very polite and professional and worked quickly and efficiently, in...
Sonoma Coast Electric, Inc
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Reviewed in August 2025
Joe did a great job installing an electric vehicle charging station in our home. He was quick to respond to set up a time to come by to survey the project and get an understanding of what I was looking for. He gave me a fair price for work comparable to how he would set it up if it were his...
Osprey Electric
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Reviewed in March 2025
On-time and professional, neat, and organized install. I would recommend.
AMP-A-NEER
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Reviewed in April 2024
Steven did a great job on installation of a new panel. I recommended him to my daughter and her husband and he did a complete re-wire of their house, on time and at a good price.
Fatima Electric, Inc.
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Reviewed in January 2024
Lancer was prompt and thorough. Had the new outlet installed in probably under an hour, and the installation was reasonably priced. Even gave me a couple of his logo mugs after he was done! Will definitely hire him again for any additional electrical work in the future.
Lancer Miller
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Reviewed in November 2023
I had a great experience with the whole Elevated Garage Doors team! I met with Joe to figure out options for our new door. He was very knowledgeable and relaxed, I didn’t feel any pressure to buy like I did with some of the other companies I met with. The install went very well. Mike and his...
Elevated Garage Doors
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Reviewed in September 2023
Chris took an old run down outbuilding and turned it into a beautiful art studio for me. He removed old windows and put in new ones. Moved the location of the old door, and Installed nice French doors. Repaired all the damage to the outside. Insulated and installed sheet rock. Put in a tongue...
Aldridge Master Builders
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Reviewed in September 2023
Good experience good price very helpful on the phone (Al), install guys came on time
United Water
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Reviewed in August 2023
The installer is the owner of the company and she is the most knowledgeable professional of her craft of wallcovering installation -which is an art in itself and requires years to perfect. There are not many wallpaper installers around today who can hang ordinary papers to the very expensive...
Sundance Decorating
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Doorbell Installation questions, answered by experts

Yes, professionals install and upgrade insulation for all home or business areas.

Costs depend on area size, material thickness, and site preparation needs.

Several types of insulation are effective for crawl spaces, with spray foam and rigid foam boards being two of the best options. Closed-cell spray foam insulation is a strong choice because it effectively repels moisture, resists biological growth, seals the air, and provides excellent thermal protection, especially in hard-to-reach areas. Rigid foam insulation boards are another excellent material as they insulate well, resist water damage, and will not settle over time like fiberglass or cellulose.

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.

While fiberglass is dangerous to work with, it’s a perfectly safe material once it’s installed. If you’re tackling the installation yourself, make sure you take the proper safety precautions and wear the right gear to avoid skin and eye irritation and lung complications. Working with a professional insulation company can mitigate these risks.

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