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 May 14, 2026

Reviewed in May 2026
Amazing experience. Red Eagle designed and installed our two new driveways for an old Pierson that had no front driveway (only street parking), and a gravel driveway in the back with access from the alley. Super prompt, professional and reasonable. Would be happy to have prospective customers...
RED EAGLE CONCRETE AND CONSTRUCTION
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Reviewed in September 2022
Fabulous; since fence was close to our garage and right next to neighbor's garage, it was a tricky situation. S-V was able to modify our gutters and convince the neighbor to allow installation of gutters. Furthermore all of the S-V workmen were observant, helpful and amazing workers. Since...
Simple-Visions Home Remodeling
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Reviewed in July 2021
Lou and his staff are great about cleaning up after their work. They take the time to make sure we are happy with their product and ready to answer any questions. Lou also gives great advice and advised against a project because we simply didnâ t have the room. The shower they installed...
Simple Visions
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Reviewed in September 2020
I’m one of those people who enjoys learning about and doing all of their own home improvement projects, but a recent fence installation was definitely more than I could take on. I contacted nearly a dozen local companies and contractors, and Taylor Enterprise Fencing was hands down the best from...
Taylor Enterprise Fencing
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Reviewed in February 2020
Pedro is very knowledgeable and efficient; he did a great job installing my new kitchen faucet.
ACE Plumbing
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Reviewed in July 2018
JV Floors did a magnificent job installing laminate and wood floors in our house. Juan is extremely detail oriented and goes above and beyond any other flooring company. The crew is also extremely nice to work with. We are very happy with their work and will recommend JV Floors to all our...
JV Floors
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Reviewed in April 2018
Installation went fine. Building inspector wanted one minor change, which was done in an hour. It's pretty high end for a small home. It's a 5KW system, grid-tied, with battery backup. When PGE goes offline for an hour or two, we don't even know. It's been working great for about 20 months as we...
Fiedler Building Company
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Reviewed in February 2018
Install of marey 16l Ng tank less water heater. Made call to home advisor they reached out to Fleck & Perry Plumbing. Ken from Fleck & Perry Plumbing called me without ten minutes after placing the call. He stated he was in the area and could stop by in around 30 minutes. He looked over the...
Kenneth G Fleck Plumbing
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Reviewed in March 2016
The original panel had an open main connection and it needed much of the main electrical feed inside the panel replaced. <br /> Bob remove and replaced the main electrical panel and breakers. This was a bigger than expected job as the new panels were a different size than the original. Bob was...
Bob White Electric
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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.

Yes. Proper, complete insulation will ensure that you trap the most cool or warm air inside your home, preventing high energy bills. In addition, insulation tends to settle and compress, leaving gaps over time; the more you insulate completely during the initial installation, the less you’ll need to do down the line.

Upgrading insulation offers several benefits, including improved energy efficiency, which leads to lower heating and cooling costs. It also enhances indoor comfort by regulating temperature and can provide noise reduction. Additionally, better insulation has a reduced environmental impact and can increase your home's value and overall livability.

Heat lost through uninsulated basement walls can account for up to 30% of the total energy lost through heat transfer to the outdoors. While homes in mild climates won't gain as much benefit from having an insulated basement as those in cold climates, the effects are still noticeable on your energy bill.

The best type of insulation for your home depends on your specific needs, climate, and the area you are insulating. For new construction, structural insulated panels are a highly energy-efficient option that is easy to install during the building process. In very warm climates, reflective insulation can be a cost-effective choice. For cold climates, fiberglass is an excellent option due to its high R-value and resistance to settling over time. Spray foam works well in humid environments because of its moisture-resistant properties. For standard attics, loose-fill, spray foam, or blown-in insulation are all suitable options.

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