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 Hardin, IL 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 December 17, 2025

Reviewed in December 2025
We have gone through Midtown when we needed a new front door so when the opportunity came to replace our bathroom window and one of the bedroom windows, we decided to use Midtown again. The gentlemen who came to do the removal and install were thorough, professional, and cleaned up the job site...
Midtown Home Improvements, Inc. (St. Louis)
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Reviewed in November 2025
Installed a staircase banner. Clean, professional, and paid close attention to detail. Would highly recommend.
Project Arcadia
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Reviewed in August 2025
We had the pleasure of Adam and his son Gage install our laminate and carpeting a few weeks ago. These two did an amazing job!!! They also finished sooner than expected. As a women most contractors and salesmen I have dealt with during this remodel have talked down to me not Adam. He took the...
Frischman & Sons Flooring
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Reviewed in June 2025
Installed electric, insulation, and OSB plywood in our 14x24 storage shed. Very well done. Tapped into the breaker box in the garage for power. Worked in any weather conditions necessary and very courteous. Workers were timely and skilled. Did not leave a mess and stayed on task. Finished in a...
RED MAPLES CONSTRUCTION LLC
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Reviewed in February 2024
We had a wooden privacy fence Installed by Jenkins Fencing and we are absolutely happy with the finished product. Not only is the product and work great, the service is amazing as well. The owner kept us up to date through out the whole process and was able to work with us on a time that best...
Jenkins Fencing
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Reviewed in January 2024
Worker showed up 10 mins early, installed 3 ceiling fans for us, and was out of there in like 60-75 mins. Prompt and efficient. Will definitely hire again!
Rentek
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Reviewed in July 2023
I hired MCC services multiple times. They cleaned my gutters and installed gutter guards. They also cleaned my chimney and repaired the inside by adding mortar to the bricks where it was missing. They are focused and get the job done efficiently and quick. He knows what he is doing and does it...
MCC Service LLC
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Reviewed in November 2022
Dan came to my shop and installed new garage doors and automatic openers for them. He was very professional and knowledgeable, but also very friendly and laid back. Just an all around good guy who does amazing work. 10/10 would definitely recommend!! Thanks again Dan!!
Door Service N More
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Reviewed in August 2021
My door was repaired within 24 hours of John coming out to look at it. The only reason it wasn't done on the same day was due to the uncommon set up that my doors have. (he had to get the part needed) I would highly recommend him for any garage door repair/installation you have. Pricing was...
Troy Overhead Doors, LLC
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Reviewed in July 2021
Rachael is so easy to work with. She tries to accommodate your schedule as much as possible. She was able to make sure mine was installed before a family event. I would highly recommend them. Dave, the installer is laid back and extremely knowledgeable and was able to ease my mind about any...
Innovative Shade Solutions, LLC
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Top-Rated Doorbell installation pros in Hardin - Updated Nov 2026

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Doorbell Installation FAQs, 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 time required for insulation installation can range from a few hours to a few days, with most projects taking 1-3 days to complete. The final duration depends on the project's size and complexity, the area size, and the type of insulation being installed.

When installing board and batten siding, make sure there is wall sheathing and a moisture-resistant barrier installed. Behind that sheathing should be plywood or OSB for you to nail the boards and battens into. If there isn’t plywood or OSB, you can install vertical furring strips at 1½- to 2-foot intervals to nail the boards and battens to.

Costs depend on area size, material thickness, and site preparation needs.

Air duct insulation typically lasts for 10 to 15 years or even longer, depending on the material and maintenance. It's important to conduct periodic inspections to check for signs of deterioration, such as water damage, tears, or general wear. If you find any of these issues, it may be time for repairs or a full replacement. You might also consider upgrading your insulation even if it's in good shape to improve your home's energy efficiency and enhance your HVAC system's performance with newer, more effective materials.

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