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 June 25, 2026

Reviewed in June 2026
Excellent Contractor that not only did the job quickly and did a fantastic job, came up with a better method of installing the uprights to make it look better and still be independent from the deck. Very reasonable price and quick to get it done. I would highly recommend this Contractor to...
Avina Construction
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Reviewed in June 2025
Needed help installing a projector screen. Jed was extremely patient and familiar with the type of system. Excellent attention to detail for my picky eye. Really great person to know in this community. Will call again in a heartbeat if I need.
ELEVATED AV LLC
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Reviewed in January 2025
I use Epperson's services for most of my household jobs. Last year, they installed a new hvac system, and they were wonderful. The last time that they came out before the new year was for a couple of faucet issues. Chad and David were not able to fix the guest bathroom faucet, but told me what I...
EPPERSON ELECTRIC
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Reviewed in March 2024
I am highly pleased with my recent porch renovation/screen installation. Noah and his crew completely stabilized the existing structure and added screening. From estimate to completion, there were no missed appointments and Noah kept in touch each step of the way. The job was completed much...
Rust & Sawdust KY
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Reviewed in December 2023
They installed new gutters and fascia on my newly covered deck. Nice work. Nice people.
Somerset Gutters
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Reviewed in September 2023
There is nouthing Kevin can't do. He uses Schuter waterproofing system for bathrooms and showers and even installed a heated floor. His work is quality and reasonably priced. He's replaced almost everything in my house and installed laminate floors while repairing wood floors.
KB Construction
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Reviewed in July 2023
We hired Pro Finish Renovations for a simple wood repair that turned out to be much more than we initially thought. We made the decision to completely remove the screened in porch and transform it into extra space. Ross did a fantastic job! Not only did he frame it but he installed new windows,...
ProFinish Roofing
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Reviewed in March 2023
I had my bathroom window replaced and William & Troy came in took out the old and installed the new one in no time. Very professional.
West Shore Home Lexington
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Reviewed in January 2023
Very professional-reviewed all types of insulation with me and helped select the best one for my situation-it was not the most expensive one and the crew that installed it were very professional-highly recommend them
C&S Insulation & Fencing
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Reviewed in January 2022
CB Tile & Flooring did a Super job installing a whole house full of Stone Composite Flooring and also a Backsplash in the kitchen. He is very professional and polite and gets things done just how you want them.
CB Tile & Flooring
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Doorbell Installation questions, answered by experts

Doubling the insulation in your home also doubles the R-value of said insulation. In other words, by adding more insulation, you can reduce the heat loss by half. Most homes benefit from increasing insulation. Older homes, in particular tend to have less insulation as is, so doubling your insulation could drastically reduce your energy bills, keep your home more comfortable, and take the strain off your HVAC system.

Yes, they address underlying issues, providing long-term seals and energy savings you might need help to achieve.

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

Insulating a detached garage won't reduce your home's heating or cooling bills—and insulating an attached garage will only have a small effect on your home's energy efficiency. However, insulating an attached garage can reduce the transfer of heating and cooling to and from the outdoors, which can reduce the amount of energy your home needs to stay comfortable. Also, having an insulated garage is just more pleasant. Balance the cost of insulating your garage with how you'll use the space to determine if the project is worth it.

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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