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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Verified Reviews for Doorbell Installation pros in Studio City, CA

*The Angi rating for Doorbell Installation companies in Studio City, 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 Studio City, 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 September 13, 2026

Reviewed in September 2026
The new door installation was handled professionally. The team worked efficiently, paid attention to detail, and made sure everything was installed and working properly.
West Hollywood Arm Garage Door
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Reviewed in August 2025
Sam was exactly who I needed to help me install some window shades. Friendly, professional, and does excellent work. Highly recommend.
Hangman Sammi D
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Reviewed in May 2025
I really love my new insulated tilt up door that Gavin from Apex garage doors installed. It even has a built in pedestrian door. They gave me a great deal and were very quick with the install.
Apex Garage Doors LLC
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Reviewed in May 2024
Jim installed 2 doors, incredibly fast and professionally. His response was prompt and cordial. Will definitely hire again!??
United Staging Inc
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Reviewed in March 2024
Hish was right on time and did an excellent job installing a new front door EMTEK lock set w Yale keypad and a Toto Washlet.
Hish the Handyman
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Reviewed in March 2023
I had a great experience with this locksmith service when I needed a new garage door opener installed. The technician was prompt and efficient, and the price was competitive. I appreciate the quality of their work and would recommend them to others.
Top Notch Locksmith & Security
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Reviewed in December 2022
Called imperial to get a quote for a new garage door installation, they had scheduled Sam to come the next day and he was great! Gave me a wide range of options and was very honest about the prices. Once we agreed on a the new door and price after 4 days Sam and his crew had people come out and...
Imperial Garage Door & Gates
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Reviewed in October 2022
Very quick response to inquiries. Completed in 5 weeks from signing contract. Installers are very friendly and helpful.
Solar Earth Choice
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Reviewed in March 2022
Excellent service and execution of installing our 2 new doors and security screen
Halaby Homes
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Reviewed in September 2021
Called and came out quickly. Did the install in a few minutes. Price was very fair. Would recommend him highly and will call him again if I need anything else done.
First Thought Plumbing
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Doorbell Installation questions, answered by experts

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.

Mineral wool wraps are the most affordable and effective insulation for crawl space ducts. They are easy to cut, last for a long time, and healthier for humans. Meanwhile, fiberglass wraps are cheaper but more hazardous and difficult to handle. If you do choose to use a fiberglass wrap, make sure you are wearing long sleeves and wear proper protective gear.

Experts use advanced techniques and tools to assess existing insulation levels and identify gaps. They implement strategic placement of new insulation to ensure complete coverage, optimizing thermal resistance and energy efficiency.

Open-cell foam insulation has a life span ranging between 15 to 25 years when well cared for. However, the material may degrade sooner in areas with high humidity or after prolonged water exposure. Proper installation and maintenance can maximize its longevity but requires close monitoring. Closed-cell foam insulation has a longer life span of 30 to 50 years.

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