Should I remove old attic insulation before adding new?

• <div>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: <ul><li>If the insulation is over 15 years old</li><li>If the insulation is wet or moldy</li><li>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></li><li>If you see signs of pest infestation</li></ul>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</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

While not every wall requires a vapor barrier, if you do need one and don’t install it, moisture can get between the walls of your home. This can lead to water damage from mold growth or rot, and the excess moisture could also attract pests, including termites, cockroaches, or ants.

The primary reason that insulation saves you money over time is that it reduces your energy bills by making your home more energy efficient. A crucial part of an insulation system is a properly installed vapor barrier. Local building codes dictate whether your insulation requires a vapor barrier based on the type installed. While some high-quality wool insulation may not technically need a vapor barrier, most municipalities still require one to meet code.

It is generally completed in a day, depending on the attic size and access difficulty.

Fiberglass is considered a favorite garage insulation choice due to its combination of affordability, ease of installation, and overall effectiveness. Fiberglass provides good thermal resistance, helping regulate garage temperatures and minimize heat transfer. Additionally, fiberglass is moisture-resistant, reducing the risk of mold or mildew formation.

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.

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