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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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

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing insulation.

The most affordable way to insulate behind unfinished walls is to install fiberglass batts or rolls. These total around $0.75 per linear foot, with the width matching the gaps between standard studs perfectly. However, it’s important to consider the R-value of your insulation and the climate in your area, as fiberglass insulation isn’t the best in terms of preventing heat transfer. Plus, the most affordable option may cost more on electricity bills over time. The most affordable way to insulate behind finished walls is to leave them up and use blown-in insulation to avoid drywall replacement.

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.

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.

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