Should you remove old insulation before adding new insulation?

• <div><p>You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.</p><p>However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.</p></div>

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*The Angi rating for Doorbell Installation companies in Bevier, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

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Last update on January 19, 2026

Reviewed in January 2026
Fast, reliable and knowledgeable owner. He made sure all my needs were met and went above and beyond to make sure I was satisfied with his work.
McDowell Excavating, LLC
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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 October 2023
I especially liked that after requesting a visit to evaluate my existing system, Alan suggested solutions that were effective and cost sensitive to our needs. I now have a system that is considerably more efficient and ready for the change in season. Best of all our work was performed timely...
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 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

You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.

However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.

The life span of fiberglass insulation can be as long as 80 to 100 years, but because of changing building codes, it’s best to get your insulation checked every 10 to 15 years. Signs of degrading fiberglass insulation include bits of batts on the floor or batts detached from frames. Having optimal, healthy insulation in your home will improve its energy efficiency, lowering your monthly bills.

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.

It is generally completed in a day, depending on the attic size and access difficulty.

Acoustic foam, fiberglass insulation, soundproof curtains, and specialized drywall are effective in reducing noise transmission.

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