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>

Can you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</p></div>

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Last update on January 20, 2026

Reviewed in January 2026
The tile work was very well done, and finished timely. We have used them several times for other work as well: small bath remodel; installation of wall mount air conditioner; and other minor things. Always pleasant, very professional, and hard workers. Recommend
Traveling Transformation
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Reviewed in November 2025
We had a fence with two gates installed on the perimeter of our 10+ acre property, H&P did a fantastic job. They were extremely professional and had great attention to detail. They were very easy to work with, highly responsive, flexible and accommodating to our ever changing schedule and...
H & P Fencing LLC
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Reviewed in October 2025
Hi-Tide Tech service was OUTSTANDING! First, they were 5 minutes early for the appointment! Being from the “old school” I believe in punctuality. They knew exactly what they were doing and wasted no time doing the work I’d hired them to do! (Install a wall mounted 75” TV). They completed...
HI-TIDE TECH INC.
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Reviewed in January 2025
Hefe fence did a great job on our aluminum and vinyl fence at our condo in Englewood Florida. The crew were courteous, professional and worked quickly ton install what we needed. Their pricing was very competitive and the work was exactly what we wanted. Ken Jxxxxxx
Hefe Fence LLC
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Reviewed in May 2024
Service call was prompt. After negotiations for new unit they arrived 4 hours later and it was completely installed today. Workers were fast efficient and worked together effortlessly to get the job completed in a timely manner. Went above and beyond to make sure we were happy with installation...
Purtz Air Service, Inc.
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Reviewed in October 2023
Windows and Door Storm Protection Professionals, LLC replaced all the windows and doors on our home. Everyone we dealt with were true pro's. From Rich Derrig their sales rep, the crew who installed the windows, and the customer support people were a pleasure to deal with throughout the...
Window and Door Storm Protection Professionals, LLC
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Reviewed in May 2023
The crew was very timely and professional. I live on lake and they install Rip Rap. Looks good and will stop future erosion. All workers were extremely polite and hard workers. I highly recommend them as they did a great job at a affordable price. Jerry Shoemaker. 5/31/2023
Greentopps Landscape, Maintenance & Tree Services, LLC
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Reviewed in December 2022
Had 3M sunscreen applied to all windows in my travel trailer. It was an awkward job because the window screens are hard hard to remove, and the windows have curved corners. Plus, the installer had to crawl over two sofas, a bed, and a kitchen sink to make the installations. He did a terrific...
Total Shield Protection
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Reviewed in June 2022
Fast, reliable and transparent. I recently hired Jantz Electric for work on a house. There were a few appliances that needed upgraded electrical cords, we needed GFCI outlets installed, and additional outlets that needed fixing and repair. The work was very professional, quick and all done in a...
Jantz Electric LLC
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Reviewed in March 2021
Doug is wonderful to work with . He is very dependable,. I am very pleased with the fence he installed for me. The fence is very good quality . His staff did an excellent job . I would highly recommend MasterCraft Home services
Master Craft Home Services of Florida, Inc.
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Doorbell Installation questions, answered by experts

Ensures uniform application and maximizes insulation effectiveness and energy savings.

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.

Insulating an unheated garage can still be worth it. For instance, insulating an attached garage can help with heat loss from your house in general, and it can also make it easier to store electronics in your garage without worrying about them being exposed to extreme temperatures.

If you use your detached garage as a workspace, insulation can still make a difference. Plus, you can use space heaters and a window unit AC to help condition the space while you work without installing heating.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

The lifespan of crawl space insulation depends on how well you maintain your insulation and the type of insulation. Fiberglass will need replacing every 15 to 20 years on average if you don't have a vapor barrier in place. If you do have vapor barriers in place, then your insulation could last much longer. Spray foam insulation can last anywhere from 80 to 100 years.

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