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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Last update on July 17, 2026

Reviewed in July 2026
VP Roofing and Construction did an outstanding job. From the quick response to review what work was requested. Providing a very competitive bid, getting the work scheduled and completed. The crew they put on my project worked very hard and we're very particular in the construction. They...
VP Roofing and Construction LLC
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Reviewed in January 2025
I needed help getting some new light fixtures installed around my basement. The company was quick to respond and came out to assist.
Construction RD
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Reviewed in November 2024
Nick was excellent. He installed a 220V outlet for a hybrid car in less than 3 hours. Initially looked like it was going to be a tricky job but he worked a cost-effective solution while taking our input and questions. Professional, courteous, and personable. We will be calling him again if we...
Mr. Light Man
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Reviewed in July 2024
Rex did an amazing job on our shower and backsplash. Communicated well, and has an amazing eye for detail. He even installed our fixtures in the shower when he was done. He went above and beyond for us. Highly recommend
Kneller Tile & Stone
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Reviewed in January 2024
It was a special order door around Christmas, so it took a little longer to get here but I wasnâ t disappointed in the quality of the door the way the door looked, and the craftsmanship of the people who installed the door
Turtle Tuff Overhead Door
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Reviewed in December 2023
Louis took up our old kitchen floor and installed new flooring. Punctuality and professionalism was amazing. Labor and materials was very affordable. Highly recommend
New Life Home Repair and Handyman Services, LLC
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Reviewed in March 2023
We had piers installed. From start of the bid, all the way through to our house being lifted, the process was amazing! Very seamless and they explained everything and even cleaned up very well.
Level Up Foundation Repair Excavation and Contracting LLC
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Reviewed in October 2022
Previously, Daniel from Mr Sparky changed all our outlets & switches, installed new fire alarms, & moved our electric wiring panel. Danielâ s exemplary professionalism, diligence, & customer service led us to contact Mr Sparky again to repair electrical damage caused by raccoons....
Mister Sparky Kansas City
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Reviewed in May 2021
I appreciated they came out to remeasure our windows to make sure the custom windows were correctly made. While waiting for the windows, they did a wonderful job keeping in touch and letting us know they havenâ t forgotten about us. The installation team was amazing-quick, knowledgeable and...
Midtown Home Improvements, Inc. (St. Louis)
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Reviewed in November 2020
We chose because of the quality or their products and lifetime warranty. We had siding install in 2014 and our windows installed in the winter of 2018. The product reps and installers were professional and did an outstanding job. We like the products so, we are currently having 2 garden doors...
Continental Siding Supply
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Doorbell Installation questions, answered by experts

Each of the three types of wool insulation has particular disadvantages. While their R-value is higher, they all cost more than fiberglass versions. Installing mineral wool and sheep wool requires protective gear. Because of its vulnerability to insects, chemicals are used in its production. Hemp wool is more costly to install than other types because additional tools and labor are involved.

Periodic checks for moisture or pest issues ensure consistent performance.

Yes, professionals install and upgrade insulation for all home or business areas.

Yes, winterizing your mobile home is helpful for your safety and savings. Keeping your mobile home safe, secure, and warm during the winter will protect it against damage from harsh weather, which can lead to expensive repairs. Not only that, but winterization also helps to lower your energy bills by keeping warm air in and cold air out.

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.

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