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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TRUSTED BY CLARENCE, MO HOMEOWNERS

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Verified Reviews for Doorbell Installation pros in Clarence, MO

*The Angi rating for Doorbell Installation companies in Clarence, MO 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 Clarence, MO 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 November 17, 2025

Reviewed in November 2025
Our garage door spring broke, we called Glenn’s and he had us read the numbers off the spring and came out the next day (Friday) to install the new springs. He looked at the existing springs and said these are the wrong size for this door. He temporarily fixed the existing springs and said he’d...
Glenn's Garage Doors
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Reviewed in August 2025
Did a great job. Started and completed the work when they said. Very reasonable price. Definitely would recommend
Borntrager's Roofing and Construction
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Reviewed in March 2025
I remodeled my kitchen recently and Dustin installed my cabinets, and put the handles on, we put the pull out shelves instead of standard cabinet shelving inside and they work & look great. He showed up on time, and finished within the time frame he estimated the total project would take. They...
North KC Handyman LLC
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Reviewed in November 2023
He was very helpful. This is our 3rd year in our house, and we were never informed of a second furnace in our home. And he found it and it was that one that was not working. He was so patient and asked great questions.
A to Z Mini Solutions
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Reviewed in April 2023
Excellent workmanship. Great communication. Very reliable. Will use again.
TJ AND J CONSTRUCTION LLC
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Reviewed in January 2023
Prompt and neat service would definitely hire again
Beer Land Management LLC
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Reviewed in January 2022
Very polite young man starting his own business. Would highly recommend for any type of service. 5 not enough 10 is better.
ProCare Tree Service
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Reviewed in May 2021
Great experience. Love this company. Very prompt
Handy Helper Of Columbia
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Reviewed in November 2015
Wehired JKT Construction and Design in Columbia Missouri, to remodel 10 rooms in 6 weeks for us at our Motel near Columbia Missouri. The project started out fair;they were here every day working. Then it got to where there were only one or two guys here, and very little was getting done. They...
JKT Construction & Design
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Reviewed in June 2013
Rich McGowan gave us an estimate for his work. We agreed. Him and another plumber arrived on time. They removed their shoes and were cafeful not to dirty the floor. Which did not matter because it was going to be pulled up by the carpet/ tile man. They let me use their dumpster to dispose...
McGowan Plumbing
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Doorbell Installation questions, answered by experts

Insulating your basement walls offers numerous advantages that make the project well worth it. By adding insulation, you can reduce the chances of moisture damage to the house's structure and lower the odds of mold growth. You'll also add comfort to the space by reducing temperature swings and increasing your home's energy efficiency, potentially reducing your energy bills to earn your investment back.

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.

For your safety, you should always wear a mask when cutting batts of fiberglass insulation. We also recommend wearing eye protection, safety gloves, and long sleeves to protect your skin. Properly suiting up helps you avoid several fiberglass issues, such as cuts from the tiny shards of glass and inhaling small bits of fiberglass.

Rigid foam board insulation is one of the safest insulation materials for basement walls. The panels offer a moisture barrier to prevent mold and mildew build-up. At the same time, this material is also fire-resistant, so you don’t have to worry as much about a fire breaking out as you would with spray foam insulation.

Structural insulated panels and rigid foam boards have the highest R-value of any insulation that contractors commonly use, with R-values reaching up to around 8.0. These types of insulation are best in extremely cold climates, but they’re generally preferred for new construction, as they can be challenging to retrofit. Blown-in and loose fill insulation provide the next best insulative value, provided the installation is done properly. It’s important to choose an insulation type that meets your needs based on climate, as maximizing R-value may not always be financially worthwhile if you live in a moderate climate.

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