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 Exeter, ME 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 September 21, 2026

Reviewed in September 2026
We love these guys. From the very first when they got us installed during Covid to the service they deliver every year. They are reliable, they know what they are doing and we know we are well taken care of…. Thanks for all you do!
Striker Power Systems
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Reviewed in June 2026
Eagle Construction was great. They renovated and restored my screened in porch that quite honestly had been installed by another contractor and was a nightmare. Now we have a screened imports that we are happy to share with friends and family. Thanks to Rick’s work. Customer service was very...
Eagle Construction and Remodeling
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Reviewed in March 2026
The previous contractor that laid the linoleum left ripples in the floor. It wasn't installed correctly. Top Notch Construct came in and did just that in the repairs, a Top Notch job. The team was also very professional and worked with me in understanding what they were going to do.
Top Notch Construct, LLC
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Reviewed in December 2024
My family has been doing business with SLTD for almost 50 years -- everything from wiring an addition, to installing a generator, to adding outlets or other minor jobs. They are the greatest!
SLTD Electric, Inc.
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Reviewed in April 2022
Great job and VERY fast. Entire project took about an hour to install. High quality, professional work.
RainWater Solutions
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Reviewed in January 2021
The generator was delivered when promised, and the installation went smoothly, even though there was a slight glitch in the fact a part sent with the generator was incorrect and the installers had to wait for the correct one. The price was exactly what I was quoted, and I would recommend Next...
Next Gen Electrical
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Reviewed in October 2019
I had received 4 estimates for heat pump installation, Nate was the only one who made me completely comfortable with his plan based on my house (I seemed like more of just another install for the other companies and not specific to the needs of my old house) Nate also stayed in touch and was...
Dave's Mechanical Maintenance
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Reviewed in September 2018
Steve was awesome. Called him on short notice and he came out the next day. Install was scheduled for the next day and completed. I didn't get the installers name, but he was all business and surprisingly, he did the installation alone. Great job and we got to see the gutters in action...
Trademark Seamless Raingutters, LLC
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Doorbell Installation questions, answered by experts

The cost to install or upgrade insulation generally ranges from $1.50 to $4.00 per square foot. The final price depends on factors such as the type of insulation chosen, the total area to be covered (home size), and local labor costs.

Depending on where you live and the conditions of your basement, you may not need to insulate your basement. Your best bet is to talk to a basement remodeling company to find out what they recommend doing.

Insulating your basement can help improve your home's energy efficiency, but it will also increase the cost of your basement remodel project. The average cost of installing basement insulation is $2,400.

For your safety, you should always wear a mask when cutting batts of fiberglass insulation. We also recommend wearing eye protection, safety gloves, and long sleeves to protect your skin. Properly suiting up helps you avoid several fiberglass issues, such as cuts from the tiny shards of glass and inhaling small bits of fiberglass.

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.

Insulating an unheated garage can still be worth it. For instance, insulating an attached garage can help with heat loss from your house in general, and it can also make it easier to store electronics in your garage without worrying about them being exposed to extreme temperatures.

If you use your detached garage as a workspace, insulation can still make a difference. Plus, you can use space heaters and a window unit AC to help condition the space while you work without installing heating.

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