Should I remove old attic insulation before adding new?

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

Can you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</p></div>

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Verified Reviews for Doorbell Installation pros in Travilah, MD

*The Angi rating for Doorbell Installation companies in Travilah, MD 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 Travilah, MD 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 June 17, 2026

Reviewed in June 2026
The installers did a great job! Customer service was outstanding.
Premier Home Pros, LLC
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Reviewed in January 2026
Installed new transformer and alarm chime for Nest doorbell camera.
Glc
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Reviewed in February 2025
Chris did a great job with the installation, on time and budget
Kingdom Air, LLC
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Reviewed in February 2025
Had a closet door installed. They did a great job and were extremely communicative throughout, including helping us decide what to install. Closet door looks great. Thanks so much!
Navid's Construction, Inc.
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Reviewed in December 2024
The locksmith that visited my home to install the door locks was professional and very efficient.
Mike's Locksmith
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Reviewed in October 2024
The electrician Antoine was outstanding. He installed the video doorbell fast and also helped with setting it up with my phone. I would highly recommend All About Sound & Video. I also recommended them to Simplisafe for the Washington D.C. area.
All About Sound & Video
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Reviewed in September 2024
It went great. Got an estimate and two weeks later the doors were ready to be installed. installation went great. everything was explained and every question was answered
A Contracting, LLC DBA Maryland Garage Doors
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Reviewed in September 2022
We had windows and doors installed. Installation went smoothly, and customer service was outstanding.
Zen Windows of Washington DC
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Reviewed in June 2022
They really came through and did a great job. I had an unusual installation which they accomplished by thinking outside the box to make the installation look great, cost less than others had quoted, and worked exactly like I needed it to.
Interconnect Electric
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Reviewed in September 2021
The installer was very nice. He explained all of the options. Installation went as planned.
HotWaterExpress.com, Inc.
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Doorbell Installation questions, answered by experts

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 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.

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing insulation.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

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