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>

Does the paper on insulation go in or out?

• <div><p>If you’re using faced insulation with paper, face the paper toward the inside of the room during the installation process. </p><p>A good way to remember this is that the paper should face the “warm side” as it’s the vapor barrier, meaning it should face toward where the heat will be coming from.</p></div>

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Last update on July 21, 2026

Reviewed in July 2026
The installation team completed the project professionally and on schedule. The new garage door fits perfectly, operates smoothly, and looks fantastic.
Garage Door Pomona, CA
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Reviewed in April 2026
Good man installed my new ac!
Trust Heating and Air Conditioning, Inc.
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Reviewed in January 2026
Very professional installation. It only took a few hours. The garage door and opener work great. It’s very quiet when opening and closing.
Besser Garage Doors
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Reviewed in September 2025
Cost was low and installers were very professional.
Felikian's Carpet/National Flooring Outlet
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Reviewed in April 2024
Very good quick installation. Was very thorough and professional. Would definitely hire these guys again.
KCP Tech Solutions
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Reviewed in March 2024
The door instalation turned out great. Livi was really busy with other projects yet he gave up his Saturday to install my entry door for my ADU. If I ever need someone with Livi 's experience and expertise I would hire him to do the job. Thanks for a job well done.
Exact Door Services, Inc.
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Reviewed in November 2023
I was somewhat put off by the fact that the technician did not use my camera/doorbell, choosing to knock softly instead. I also prefer to get the invoice prior to payment. Otherwise, the outcome was good.
Speedy Garage Door and Gate, Inc.
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Reviewed in November 2023
Great guyâ s that did the installation. Highly recommend them
Path to Prosperity LLC
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Reviewed in June 2023
I would recommend this company for their knowledge, customer service, and speed of installation. After all the paperwork was done and we gave the green light to move ahead with the installation, everything was completed within a few weeks. The installers were polite, worked well, quick, and...
D.B. Kitchen & Bath Cabinets, Inc.
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Reviewed in January 2023
Very happy with the work. Installer Very knowledgeable and professional. I would hire this company again. Thank you for the great experience.
Lion Glass Installations, Corp.
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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.

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.

Through R-value assessments based on climate and existing insulation.

Reflective and high R-value batt or roll insulation are often considered energy-efficient, offering significant thermal resistance benefits.

If you’re using faced insulation with paper, face the paper toward the inside of the room during the installation process.

A good way to remember this is that the paper should face the “warm side” as it’s the vapor barrier, meaning it should face toward where the heat will be coming from.

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