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 Onalaska, WA 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 October 06, 2025

Reviewed in October 2025
It went great. Andy was able to start quickly and fit us in. He installed drywall, soffit and flooring as well as doing some Painting for us. Would recommend him to anyone and hire him again if we have any future home remodel or handyman services.
Coussens Custom Construction
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Reviewed in August 2025
Neil carefully leveled my floor before installing vinyl flooring, and the finished result is stunning. He has an outstanding sense of detail and quality, and it shows in every aspect of his work. I couldn’t be happier with the finished work.
Neilius Construction LLC
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Reviewed in November 2024
I recently had a generator installed by Emerge Electrical, and I couldn’t be more impressed with the service I received from start to finish. From the initial consultation to the final installation, the team demonstrated professionalism, expertise, and a genuine commitment to customer...
Emerge Home Services
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Reviewed in March 2023
We needed to upgrade the electrical in our mobile home and add power to our garage/shop. I called ASE and spoke to Art. He was able to come out that day and give a bid. Also met me at my son's house later that day to check out an electrical issue. Bids were very acceptable and work was...
ASE, LLC
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Reviewed in March 2023
they called same day came the next morning had garage doors in stock and installed it.
S&S Construction Services, LLC
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Reviewed in September 2022
The installer, Adam arrived on time. He was pleasant and professional. He made certain that all my questions were answered before he began. He took care to ensure that the work he was doing was clean and not disruptive. He was really fast and explained thoroughly how everything worked.
Fast Water Heater Company
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Reviewed in May 2021
Bob and crew installed flooring, ceiling, insulation and painted the interior of our garage. Creating an insulated workout room with lots of storage. Crew was friendly and professional. An excellent results.
Henricksen Contracting, LLC
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Reviewed in May 2021
To Whom it Concerns: Chris J and Larry A were my installers and I can't be more happy with the job the completed! I live in a very old home built in the early 1900's and they had quite a challenge with the job in store for them. I have a bay window that used to be 3 glass panes held...
Renewal by Andersen of Washington
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Reviewed in March 2021
I hired Bruce for my new construction, interior and exterior. He exceeded our expectations. He kept in touch to ensure it was done in a timely manner and in the window we were wanting it. If fact we were so happy with the end result we hired him again for our rental unit. We even had new...
Bruce W. Nichols Painting
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Reviewed in February 2020
Estimator showed quickly. Install team came on time and did a great job
Rainier Pacific Garage Doors Inc
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Doorbell Installation questions, answered by experts

In addition to adding insulation to your attic, you may want to add a radiant barrier. A radiant barrier works by using reflective material, such as foil, on the attic floor. As heat penetrates the roof and enters the attic, the radiant barrier reflects the heat upward and back through the roof. If you receive a lot of direct sunlight on the roof, using both a radiant barrier and insulation in your attic can provide significant benefits.

Insulating a detached garage won't reduce your home's heating or cooling bills—and insulating an attached garage will only have a small effect on your home's energy efficiency. However, insulating an attached garage can reduce the transfer of heating and cooling to and from the outdoors, which can reduce the amount of energy your home needs to stay comfortable. Also, having an insulated garage is just more pleasant. Balance the cost of insulating your garage with how you'll use the space to determine if the project is worth it.

Yes, including recycled denim and cellulose from natural fibers.

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.

The time required for insulation installation can range from a few hours to a few days, with most projects taking 1-3 days to complete. The final duration depends on the project's size and complexity, the area size, and the type of insulation being installed.

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