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 Cloverdale, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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

Last update on May 14, 2026

Reviewed in May 2026
We hired Amp—A-Neer to install two bathroom extractor fans. Appreciated the free quote and willingness to pull a permit. The communication was great and the price was competitive. Would recommend!
AMP-A-NEER
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Reviewed in June 2025
We had a great experience working with Joe. He installed overhead lights, a speaker system, and ceiling fans in our home, and everything was done to a very high standard. He was professional and punctual. The results look and function perfectly. Highly recommended.
Osprey Electric
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Reviewed in December 2024
Joe has done work for us on several different projects from a complete Condominium remodeling job to smaller jobs like fixing closet doors, installing shelves and even installing a dishwasher! His work is top notch and he is reliable, fair, professional and very honest. You won’t go wrong...
Bay West Construction
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Reviewed in September 2024
Adam installed metal railing to my outdoor steps. He was knowledgeable, professional, and pleasant to work with.. He was patient and took time to explain all the available options. The end result was exactly what I wanted. I highly recommend him.
Magic Metal Ornamental Fabrication
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Reviewed in June 2024
Steve and his team have done a number of jobs for me from installing light fixtures to adding additional outlets in the bathroom which required going underneath the house. They are professional, timely, courteous, clean, reliable and reasonably priced!
Warner Electric
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Reviewed in August 2023
I have worked with Chris on multiple projects, ranging from complete commercial and residential rough-in and trim to generator installs, and more. On every occasion Chris and his team has always supplied a professional and superior product.
CSK Electric
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Reviewed in July 2023
Very well except for supply chain issues having nothing to do with Green leaf Roofing. Jorge was professional and responsive. We had to replace a large sliding glass door and a large window and the installer was very knowledgeable about the procedures and materials needed to resolve the leaks.
Green Leaf Roofing
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Reviewed in January 2023
Dawn and team were great. Extremely knowledgeable and professional from start to finish. Very helpful design input and flexibility during installation. All was done on time, on budget. Highly recommended.
Nickel Creek Landscapes & Design
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Reviewed in March 2022
Hired to clear clogged toilet drain and install new toilet. Efficient, knowledgeable and professional!. Showed up at the time promised and completed job quickly. Highly Recommended!
Campos Plumbing, Inc.
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Reviewed in September 2021
Adam does a great a job, and is very pleasant to deal with. He gave me a good bid right off the bat over the phone to install tiles in the entranceway of our house. Adam did a great job laying out the tile. I was one tile short, because I had ordered the tile ahead of time and miscalculated. ...
AK Tile
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Doorbell Installation questions, answered by experts

Insulation is professionally installed by measuring spaces, cutting materials to fit correctly, and placing them without gaps for optimal thermal resistance.

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.

Fiberglass is the best insulation for HVAC ducting because it's inexpensive, widely available, versatile, and long-lasting. Fiberglass also offers acoustic insulation in addition to thermal insulation, which can contribute to a more peaceful home environment. You can use other materials like mineral wool, but fiberglass is the industry standard.

Monolithic slabs don’t require insulation, but many homeowners choose to have their contractors install insulation under the slab during construction. This can help improve home efficiency even more and keep indoor temperatures more stable. Slab foundations are more energy-efficient than uninsulated crawl spaces and basements, and insulated slab foundations are more energy-efficient than insulated crawl spaces and basements.

Ductwork should be wrapped in insulation in certain locations. This includes unconditioned interior parts of the home, such as attics, crawl spaces, basement ceilings, and between floors. Duct joints should also be insulated since they're more likely to leak air than other parts of your system. Building codes in some areas also require ductwork to be insulated.

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