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 Lafayette, CA

*The Angi rating for Doorbell Installation companies in Lafayette, 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 Lafayette, 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 August 14, 2025

Reviewed in August 2025
Elliot and sons has been installing our products on homes for quite some time. We are extremely satisfied with their abilities to get the job done right. I have never had a complaint or an inquiry. They are at the very top of my list of top installers in the country. Any work they do is quality...
ELLIOTT & SON ROOFING
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Reviewed in July 2025
Eagle installed a smart garage door opener at our place, and it?s been amazing. I can control it from my phone and never worry about leaving the door open again. The install was clean and quick. Couldn?t ask for better.
Eagle Automatic Gate & Door
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Reviewed in April 2025
They know what to do and are done all installation smoothly and efficiently.
Hill's General Plumbing Services
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Reviewed in January 2025
I NEEDED A GOOGLE NEXT DOORBELL INSTALLED AND I CALLED VERNOUS INC ( AMIR ) TOOK THE INFORMATION AND SENT ( MAHDI) TO DO THE JOB. MAHDI HAD TO RESEARCH THE NEW DOORBELL AND THE CHIME UNIT. THE RESULTS WERE THE CHIME WAS OLD AND NOT COMPATIBLE WITH THE NEXT DOORBELL. I ORDERED A...
Vernous Inc.
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Reviewed in January 2025
Jesus installed an 86 inch TV and also installed the receiver and hooked up speakers. He was polite, professional and very reasonable. I would hire Jesus again anytime. Excellent service.
mvp construction and remodeling
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Reviewed in February 2024
Came by to give me a quote to install my level two EV charger. Quote was extremely reasonable, and they said they could do the install right there and then. It was awesome. I will absolutely hire them again.
Single Line Electric
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Reviewed in November 2023
Prompt response. Quick quote and did great work installing an attic pull down ladder. Will hire again.
Live Oak General Builder, Inc.
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Reviewed in June 2023
Communication while waiting for doors was not good but windows and installation was great.
Brothers Home Improvement, Inc.
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Reviewed in June 2023
Eli installed the unit and was great!
All Water Heaters & Plumbing LLC
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Reviewed in October 2022
Such an easy process! The installers were very fast and efficient and showed fantastic teamwork! Thanks again.
AMM Fencing
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Doorbell Installation questions, answered by experts

It is usually possible to install insulation yourself, but it’s often better to hire an insulation professional. An experienced insulation pro can determine which type of insulation is best for your space and the R-value get the most value and comfort in your home. Certain types of insulation can cause skin, eye, and lung irritation, and a professional will have the equipment necessary to keep themselves safe and limit the effect on your indoor air quality after the installation. Certain types of insulation—like blown-in and loose-fill insulation—demand a professional for proper functionality and safe installation.

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.

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.

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.

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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