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>

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>

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Last update on May 03, 2024

Reviewed in May 2024
Final Touch Construction is the epitome of what a construction company should be. The owner, Jose Lima-Ramos brings a skilled, cohesive, friendly crew to every job. We have called on Final Touch for 3 different jobs. The first time we called, we were in a crisis where we discovered extremely...
Final Touch Construction LLC
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Reviewed in November 2023
Removed existing tub/shower fiberglass enclosure and installed glass door shower unit from Home Depot. Installed cement board and grouted tiles. Installed new kitchen faucet, repaired cracked PVC waterline, installed gas clothes dryer. Strong recommendation for Mikes Home Improvements
Mike's Home Improvement
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Reviewed in October 2023
Mike is an outstanding contractor who is very professional and does excellent work. He removed existing fiberglass shower fixture and installed a beautiful shower kit from Home Depot. What an amazing improvement completed by Mikeâ s Home Improvements. Also installed kitchen faucet, fixed...
Mike Home Improvements
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Reviewed in August 2021
Reliable, finished on time, and within budget. Professional communication and installation.
Apperson Energy Management
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Reviewed in April 2020
Competitively priced , great quality carpet and installation.
Robert's Flooring
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Reviewed in April 2019
Green Light was quick to respond and easy to work with. The final price was significantly less than the quote and I was very pleased with the work. He installed two fixtures and repaired a third that had not worked in several years! This was all done in an hour. I will definitely call again for...
Green Light Electric
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Reviewed in January 2019
The gentleman that came out to quote the windows was great and the price was fair, but I am disappointed in the fact that he assured us that our previously Sears installed windows and siding were still covered under warranty which I later found out was not true. When I tried to reach the...
Sears Home Improvements - Windows
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Reviewed in January 2019
Anthony was quick to respond to my request for a quote. Once hired, he worked diligently until the job was completed. Anthony said that his goal was that the customer be 100% satisfied with his work. He painted, hung new doors, and installed new molding...it all looks great.
Leoni's Quality Painting Inc
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Reviewed in June 2018
I called and asked if they could get it disconnected so that I could find a replacement for it. They offered to come out the next day and I was super impressed by the expediency. I’m looking for a new light and hope to have them come out soon to install it.
Joe Schmo Electrical Services
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Reviewed in August 2017
Harmony Air was wonderful to work with. Sasha is extremely knowledgeable about the latest technologies and came up with a systems design to replace my poorly designed ducted system with mini-splits. The units he installed are incredibly efficient and quiet. I can barely tell that the outside...
Harmony Air
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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.

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

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.

When it comes to fiberglass insulation versus foam board, there are a few notable differences, both aesthetically and functionally. Fiberglass insulation is soft and flexible, meaning it can be squeezed into tight spaces more easily than foam board. Fiberglass insulation also has a higher R-value, making it a better pick for colder climates. However, foam board insulation can resist moisture and pest damage much better than fiberglass.

Periodic checks for moisture or pest issues ensure consistent performance.

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