Should I remove old attic insulation before adding new?

• <div><p>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: </p><ul><li><p>If the insulation is over 15 years old</p></li><li><p>If the insulation is wet or moldy</p></li><li><p>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></p></li><li><p>If you see signs of pest infestation</p></li></ul><p>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</p></div>

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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Verified Reviews for Doorbell Installation pros in Corvallis, MT

*The Angi rating for Doorbell Installation companies in Corvallis, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

*The HomeAdvisor rating for Doorbell Installation companies in Corvallis, MT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

Last update on June 23, 2026

Reviewed in June 2026
Aaron installed a new A/C unit at my home. He was professional, knowledgeable, and had great customer service. Taking the time and care to explain how it all works. Family owned and operated. I would highly recommend and look forward to using them again in the future.
American Heating Cooling & Refrigeration, LLC
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Reviewed in March 2026
Justin and crew did the initial setting of SIPS panels (very time consuming and heavy equipment needed) then returned to install doors, windows and all interior trim. They are very detailed oriented. Several changes were made during the build process. Justin was able to accommodate on the fly...
Three Dog Construction
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Reviewed in March 2026
We recently installed a new front door and its frame, and the entire process was smooth and efficient. The door feels sturdy and secure, with a clean design that really enhances our home's curb appeal. Overall, the installation has made a noticeable difference in both the look and the insulation...
Renewal by Andersen of Montana
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Reviewed in February 2026
Needed professional to drill screw holes into porcelain tile to hang shower tower. Small job but local tile installers & plumbers wouldn't do it because of liability of cracking tiles or hitting electrical/plumbing behind wall despite my knowing location of electrical/plumbing/studs. I've never...
Dallas Construction LLC
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Reviewed in June 2023
Great experience! Outlets look and work great. Light fixtures were installed with great attention to detail.
Attaboy Services, LLC
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Reviewed in February 2022
Very professional and knowledgeable installation. Just what we wanted. Even while it was snowing!
Renewal By Anderson Montana
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Reviewed in October 2021
New windows installed by the K-Designers team turned out great. Timing of install, ease of product use, and quality went according to plan. The crew leader was kind, respectful, and communicated well.
K-Designers
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Reviewed in July 2021
Dave was extremely professional and punctual! His craftsmanship on the installations of a privacy fence was top of the line! I would highly recommend Dave and his helper to anyone looking for a great value and great job! Thank you Dave! Vickie V
Spartan Architectural Fencing
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Reviewed in February 2021
He did a wonderful job installing porch railing and hand rails, also fixed my step. Showed up when he said he would, very quickly installed everthing, he even shoveled my driveway!
Big Pine Industrial, Inc.
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Reviewed in November 2020
Very prompt follow up when I had questions after installation.
Orca Fireplace, LLC
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Doorbell Installation questions, answered by experts

Yes, you can install insulation over ductwork, and doing so can save you money. Without insulation, the HVAC unit must work harder to force warm or cool air around the home, and once the air reaches the vent, it may not be the correct temperature. Insulating HVAC ducts makes your system work more efficiently, saving you money on heating and cooling bills.

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

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.

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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