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 Campo, 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 July 17, 2026

Reviewed in July 2026
Aaron with Five Point Electric is amazing. We needed a home car charger installed. Aaron’s work was fast and professional. Honestly it looks like the charger was put in when the house was built. Highly recommend Five Point Electric. ⭐️⭐️⭐️⭐️⭐️⭐️
FIVE POINT ELECTRIC INC
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Reviewed in April 2026
Very quick, knowledgeable, though and detailed minded. Great conversation during installation
Prestige Window Tinting
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Reviewed in June 2025
They communication was a an issue all way through both the sprinkler and grass seed project. The install and ground coverage was not thought out and we are getting non saturation spots through out the yard. The grass topper was to thick and many areas the grass never grew through. So, what we...
Rain Professionals Landscape Services
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Reviewed in May 2025
I contracted with NR Hvac to install two mini-split heat pumps. They gave me a very good quote for the work. The technicians were both outstanding, especially the lead technician Augustine Linares. I'm a licensed engineer and have inspected the work of hundreds of contractors over the years. Mr....
NR HVAC
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Reviewed in May 2024
Professional and very fast installation without details at work. Recommended!!
Bovey Raingutters, Inc.
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Reviewed in February 2022
Our flooring looks amazing. Christian Brothers has an extremely professional team of installers. Their attention to detail and quality of their workmanship are the reason we have a beautiful hardwood floors that we will enjoy for years to come.
CHRISTIAN BROTHERS FLOORING
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Reviewed in October 2021
They did a very good job and were very professional. I had them install my CellFi Go X and move a cable box. I am very happy with the service that I received.
Amerisat
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Reviewed in July 2020
On time, and explained what had to be done. Living out here in Pine Valley it can be difficult to get anybody to come out to even bid. Not a big job, 5 checked off, 1 didn't call back, two weren't interested, to far, and one sent a salesman. The one installer did a great job, and finished quickly
ASI Plumbing, Heating & Air
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Reviewed in July 2020
Steve, Jonathon, and Toby did an outstanding job installing our new windows !!
Renewal by Andersen of Greater San Diego
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Reviewed in February 2019
This company delivered outstanding service, from start to finish. I decided to have my entire house remodeled with new windows, so you can imagine my frustration when I received a call that the installation was going to be pushed back. Kate from the office didn't let this minor hiccup stop her...
Dreamstyle Remodeling of San Diego
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Doorbell Installation questions, answered by experts

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.

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

Vapor barriers in attics are a bit outdated and most areas no longer recommend them for attic spaces. For vented attics, the best method is usually to install drywall and cover it with latex paint before attaching insulation fiberglass, cellulose, or foam insulation. When renovating an attic to use as a living space, a contractor can guide you on the best way to cover insulation.

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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