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>

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>

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Last update on June 26, 2026

Reviewed in June 2026
Scheduling and install were quick and easy
Affordable Home Remodeling
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Reviewed in May 2025
Mad City Windows & Bath did an excellent job on my new shower installation. Love the new look, the entire process from sales to completion went smoothly. The guys at Mad City were professional, friendly and kept me up to date on the entire project. Thanks Mad City!
Mad City Windows & Baths
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Reviewed in December 2024
Shawn did a great job on many projects to freshen up our farmhouse. He refinished our wood floors, installed new paneling in the kitchen and bathroom. He also installed a new wash basin in the basement and did repairs around windows in multiple locations. We would highly recommend him to anyone.
Shawn The Handyman LLC
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Reviewed in December 2023
Ben was originally a sub contractor for an addition to our home in Highland, WI. He installed new duct work to the dormer addition, and I retained him for furnace replacement, and, later, addition of a central a/c unit. I appreciated his openness to questions, his attention to detail and his...
Affordable Quality Heating & Air Conditioning, LLC
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Reviewed in July 2021
Nate is a master craftsman and an artist with construction and design. He created a handicap accessible deck with a ramp and entry into the cabin in two places. He remodeled the cabin to be fully accessible. His design and construction of the garage and carport were integrated in style, shape,...
HEARTLAND BUILDERS LLC
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Reviewed in February 2021
The work looks OK from the outside. But the experience was poor . The specific product contracted for was not applied. There was damage to the insulation material under the siding because they worked off ladders versus using platforms. They dropped an expensive barn light which I had to...
Right Choice Construction, LLC
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Reviewed in January 2021
Mat did a wonderful job at laying out the system and installing it according to his design. He was on time and on budget.We had bids from another installer and Mat was right there on price and actually included a few things that were not on the other bid. I would not hesitate to have him do more...
Driftless Irrigation & Lighting, LLC
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Reviewed in February 2020
They did a great job, from the salesperson Joe that came to my house and explained everything, to the guys who installed the windows and made sure they had them perfect and left my house cleaner then when they got there!
Mad City Windows & Baths
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Top-Rated Doorbell installation pros in Fennimore - Updated Nov 2026

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Doorbell Installation FAQs, 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.

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.

Yes, winterizing your mobile home is helpful for your safety and savings. Keeping your mobile home safe, secure, and warm during the winter will protect it against damage from harsh weather, which can lead to expensive repairs. Not only that, but winterization also helps to lower your energy bills by keeping warm air in and cold air out.

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.

Yes, professionals install and upgrade insulation for all home or business areas.

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