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 Cleora, OK 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 15, 2025

Reviewed in December 2025
Unfortunately, this is set up for just fence work. Jake did a gut and remodel and partiallybuilt a deck! He did not get it right and then he walked. He put post covers on, sent me pictures showing them on, then took them off and left them off. He didn't do the railing as instructed and said...
Trails End Roofing And Construction
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Reviewed in August 2025
50 percent of the estimated cost was paid to start the the project first to build a retaintbg wall second to replace a garage side door with a awning over the door to protect it from the weather next to repair a 20 ft roof over the back yard deck.additional concrete was poured for the garage...
Dream Builds Construction
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Reviewed in May 2023
They were prompt and got the job done. Courteous, clean, and called me Miss Cathy. Cleaned up afterwards. UPDATE: A trench digger was run and they broke the sewer line. Never told me about it or even tried to fix. I requested my breaker box be changed from 100 amp to 200. They left old one in...
Vibe Electrical Services, LLC
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Reviewed in May 2022
Roger was here promptly & ordered a part after 1st visit. 2nd visit Roger came out again to install part. He was very friendly and spent the time to assist me moving around the food in my freezer. That was above and beyond customer service.
Straight Edge Appliance Service & Repair
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Reviewed in February 2022
This company installed some fence for me! Answered all of my calls, were on time, did great work, all at a reasonable price!! Definitely give ‘em a call!!
Crawfords Fencing and Dirt Work
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Reviewed in April 2021
Hard working friendly crew who installed my roof and took exceptional care for detail with the install and the clean up. They were not the cheapest or the most expensive. I told them I'd call when I was ready and they were patient and was not pressured in any way. The professionalism they...
JSI Roofing
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Reviewed in February 2021
Amazing company! Has very competitive prices, explained everything quickly and concisely. They installed my water conditioner and purifier the next day and even fixed a lot of sloppy work that had been done by the previous installers of an existing water softener & heater. Highly...
H2O to Go
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Reviewed in December 2020
Installers were on time and did neat detailed work, cleaning up everything before they left.
Rain Guard of Tulsa, Inc.
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Reviewed in November 2018
On time for both estimates and work. Completed on time....installer was a great guy!
The Original Plumber, Inc.
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Reviewed in March 2018
Landis was very quick to contact us and came to do a free estimate timely as well. After we chose to install our ceiling fan we were quickly scheduled and the installer was early to the appointment. The Fan was installed quickly!
Landis Enterprises, LLC
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Doorbell Installation questions, answered by experts

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.

Mineral wool wraps are the most affordable and effective insulation for crawl space ducts. They are easy to cut, last for a long time, and healthier for humans. Meanwhile, fiberglass wraps are cheaper but more hazardous and difficult to handle. If you do choose to use a fiberglass wrap, make sure you are wearing long sleeves and wear proper protective gear.

Fiberglass is considered a favorite garage insulation choice due to its combination of affordability, ease of installation, and overall effectiveness. Fiberglass provides good thermal resistance, helping regulate garage temperatures and minimize heat transfer. Additionally, fiberglass is moisture-resistant, reducing the risk of mold or mildew formation.

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.

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.

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