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 Dewar, OK

*The Angi rating for Doorbell Installation companies in Dewar, OK 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 Dewar, OK 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 January 14, 2026

Reviewed in January 2026
Amazing customer service! I recently bought a new home and needed to install new garage doors. Not only did they install the two doors I needed, but also took care of the openers as well! Definitely recommend them!
Flores Overhead Door
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Reviewed in May 2025
He was prompt, efficient and competent. He has completed large and small projects which included lawn care and landscaping of a large, difficult, terrain. He repaired an overhead garage door, a door on my shop building, installed a dishwasher in my home. He has cleaned gutters , graded my...
Razor Sharp Landscape and Handyman Services
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Reviewed in November 2023
Came on time and quickly installed cabinets. Could not be happier!
Burkes Handyman & Home Renovations
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Reviewed in February 2023
The initial gutter and cover install was great, their warranty and customer service is horrible. I would recommend going with another company that has a warranty longer than a year and stands behind their work. I have tried to contact with pictures and videos (leaks under our soffits and our...
Diamond Gutter Company, LLC
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Reviewed in January 2022
Job not finished yet needs a floating floor to be installed, tile ordered
Coal Creek Construction
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Reviewed in September 2017
Had two wheel chair ramps installed in my house .. Norman and his crew are awesome ..polite and dependable. They finish everything by the end of the day. I am having him come back to build a privacy fence on the property. Cant top these guys. They even came out on Labor Day 😁
Bell Builders & Wiring
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Reviewed in May 2017
Great! Fixed the motor and discovered the circuit board problem when motor did not start. They called back to CHOICE Home Warranty, got work order, ordeted the part and return next morning to install. I called at 9am. And the technician was here by 3 pm. Great folks. Understanding people at CHW....
Choice Home Warranty
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Reviewed in February 2017
Andrew was very helpful throughout the whole process. He came out and gave me a quote very quickly. He also helped me pick out materials for the shower. He was also very flexible on when he could do the work. The day after the materials came in he installed the shower. It took just under 5...
Stonebridge Construction
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Reviewed in November 2015
I called in the afternoon to see if someone could come out because my heater would not get warm. It took a while for John to make it to my house. It was almost 9pm, but I was shocked that he still came out that! He stayed in contact with me the whole evening to assure me he would be out. He had...
Morris Heat and Air
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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.

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.

Heat lost through uninsulated basement walls can account for up to 30% of the total energy lost through heat transfer to the outdoors. While homes in mild climates won't gain as much benefit from having an insulated basement as those in cold climates, the effects are still noticeable on your energy bill.

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.

A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.

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