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>

What are the four common types of insulation?

• <div><p>While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.</p></div>

Can I use fiberglass insulation to soundproof a room?

• <div><p>We do not recommend fiberglass insulation for soundproofing purposes, especially if you are working on a room that’s part of your living space. <a href="https://www.angi.com/articles/diy-dangers-fiberglass-insulation-hazards.htm">Fiberglass insulation is dangerous</a>, and the installation process is hazardous. It is also harmful to the environment. When there are so many newer, healthier non-fiberglass alternatives in the market, the lower cost of fiberglass insulation simply doesn’t justify the harm and danger it poses.</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>

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Last update on November 24, 2020

Reviewed in November 2020
We recommend continental siding because the installers did a wonderful job. The house looks beautiful. We really like the color and it was the right color.
Continental Siding Supply, Inc.
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Reviewed in October 2020
Good quality windows. Installers were excellent. Very Happy with the windows. The clean up was very good. It helped the utlities bill helped 6%.
Continental Siding Supply
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Reviewed in May 2020
Contract was put together by employee who seriously underestimated price of materials and labor, then quit suddenly. Stalled the project a bit. Steve (owner of company) stuck by the contract and I’m pretty sure he lost money on this project, but he did right by us. The bathroom looks great,...
Top Gunn Family Construction, Inc.
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Reviewed in March 2020
great staff from start to finish showing you what you need to know answering questions and showing you how everything works once it is installed making sure you know how it works before they leave
Universal Windows Direct of St Louis
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Reviewed in July 2018
I had the bathtub removed and had a shower put in. We really like the shower. The installer was really nice and cleaned up after himself.
Bath Fitter
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Reviewed in March 2018
Dave explained everything that should should take place with the install, and all equipment that was needed and how it is supposed to work. He answered all my questions and was very professional with suggestions.
Transform Home Improvements (formerly Sears)
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Reviewed in October 2014
Frank and his crew installed pier system to stabilize my front porch. Frank was very helpful in answering all of my questions and concerns. Crew show up right on time and did a very professional job! Would definitely use him again.
Advanced Foundation Repair & Replacement
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Reviewed in July 2013
Lynn and his crew were supposed to tear out the cabinets by a certain date and the kitchen was not ready when the cabinets arrived. He got paint all over the new cabinets and trim. The mudding job on the walls looks terrible and there are waves on the walls where the surface is not flat. He took...
Worry Free
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Reviewed in June 2013
This is a premier exterior remodeler in the St. Louis area. They were very professional in all aspects from the first time I met their design specialist to the very last nail that was picked up. They went out of their way to make sure that I was completely satisfied with my project. Every one...
Lakeside Renovation & Design
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Reviewed in March 2013
Jim arrived on time. Very polite. told us that the opener was going out. Installed the opener. And was thankfull that we called him.
Durbin Garage Doors LLC
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Doorbell Installation questions, answered by experts

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.

While there are many different kinds of insulation, spray foam, blown-in, foam board, and batt and roll are the four types you’re most likely to see. That doesn’t mean they’re alike, though. Each one varies drastically in terms of cost, materials used, and how they’re installed—not to mention, how well they limit heat transfer.

We do not recommend fiberglass insulation for soundproofing purposes, especially if you are working on a room that’s part of your living space. Fiberglass insulation is dangerous, and the installation process is hazardous. It is also harmful to the environment. When there are so many newer, healthier non-fiberglass alternatives in the market, the lower cost of fiberglass insulation simply doesn’t justify the harm and danger it poses.

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.

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