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 March 28, 2025

Reviewed in March 2025
From the very first meeting with our advisor Alan to updates when our project would start was very professional. Everything fell into place as stated. We had to delay project twice for appts and it still went as planned. Our installer Alberto was very good. It amazed us as to how much he could...
Re-Bath Waco
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Reviewed in August 2024
Checks cashed. Promises not kept. Business owner has gone silent for over a week. We used this company to install a septic system costing 5 figures. Business owner: Fill dirt promised, never delivered. Plan/ideas to fix ponding problem promised, never delivered. CAD drawing of dispersal...
Hunter Environmental Solutions, LLC
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Reviewed in April 2024
I did not see the option, but I received window tinting. The man who installed it was on time and did and excellent job.
D & T Tinting Services, LLC
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Reviewed in March 2024
I talked to John Barajas, the owner of 3rd Coast Developers. He was telling me about the aluminum powdered gates that he makes. I was immediately interested in this kind of gate simply because you never have to deal with corrosion like rust. Now thatÃ¢Â Â s my kind of gate. Wow I was just ready...
3rd Coast Developers
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Reviewed in July 2022
Our septic system went out and we called for quote and replacement. Precision did a good job with the septic replacement, but our septic replacement job was prioritized lower than new home installs, and our family had to wait many weeks without toilets in the house and limited showers.
Precision Septic Service, LLC
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Reviewed in July 2021
Dan was honest, reliable, courteous,dependable and can think outside the box. He was able to configure deadbolt install on 1885 farmhouse with non traditional size doors. I would highly recommend him! He always left work site neat and clean. Wonderful work and work ethic.
Dan the Handyman
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Reviewed in April 2021
This is actually the 2nd house Heather has done for me! When I tell you she takes care of everything... I mean everything! Her & her Installers are some of the best I've ever worked with! Her installers actually care about your house & belongings. Not only was my floor perfect but...
HLM Floors
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Reviewed in July 2020
They did an awesome job. Sprinkler was installed during the “off” season. Mike was quick to get the quote off and scheduled the workers the following week. Easy to communicate with. No issues with the system. Can’t beat the warranty he provides either for peace of mind. Def use them! Referred a...
Hydroquest Irrigation
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Reviewed in June 2019
Amazing service and technical skills. Ben was very professional and installed four flat screen tv’s in our new home. I would highly recommend him and his work.
Harper's Mega Services
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Reviewed in September 2018
Their customer service was incredible. The crew that installed the windows was amazing, quick and efficient, thorough, and very friendly.
BVS Home Experts
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Doorbell Installation questions, answered by experts

Mineral wool has an excellent life expectancy of up to 50 years, provided it's kept dry and free of pests. Compared to fiberglass, with a life span of 20 to 30 years, mineral wool stacks up well for long-term cost savings. Sheep wool maintains a similar life span to fiberglass, while estimates for hemp wool insulation life expectancies are all over the board, ranging anywhere from 20 to 100 years.

They recommend sustainable materials and water-saving fixtures, tailoring choices to balance sustainability and style.

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.

Each of the three types of wool insulation has particular disadvantages. While their R-value is higher, they all cost more than fiberglass versions. Installing mineral wool and sheep wool requires protective gear. Because of its vulnerability to insects, chemicals are used in its production. Hemp wool is more costly to install than other types because additional tools and labor are involved.

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.

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