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 you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</p></div>

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Last update on April 20, 2026

Reviewed in April 2026
The doors were installed and work perfectly! Would not recommend anyone else but him. Thank you and goodbye to WD!
Tailored Garage Doors
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Reviewed in May 2025
Mad City did an outstanding job in our window replacement project, in Story City, IA. Aarn and Cole, out of their Des Moines location were the primary installers and were extremely professional, and caring about their work performed. Cleaned up when they finished each day (2 1/2-day job) and...
Mad City Windows & Baths
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Reviewed in May 2025
Excellent job of installation - friendly, answered my questions. Cleaned up after the job. Love the windows!
Renewal by Andersen
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Reviewed in October 2023
When it was time to purchase a new refrigerator, Ken's Appliance helped me find the right one for my older home with built-ins. It arrived before the expected delivery date and was installed flawlessly. Thank you Ken's, good job!
Ken's Appliance and Service
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Reviewed in September 2023
I couldn't have found a better company to replace my old windows. Some are not square because of the age of my home and the Zen team, Brent and Hunter, took their time with each window, making them look beautiful inside and out. The amount I paid was what the original estimate was, so no...
Zen Windows Des Moines
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Reviewed in July 2023
the windows are are great and easy to operate. the install team was thorough, friendly and professional. Job well done.
Mad City Windows & Baths
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Reviewed in June 2023
David was personable, prompt, and precise in his installing of a deadbolt and door knob. I would hire him for other work, as well! 5/5
David J. Soukup Construction, Inc.
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Reviewed in January 2023
I thought Anthony did a wonderful job on installing my new ceiling fan with lights!
WireOne, LLC
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Reviewed in January 2022
The installation went smoothly and efficiently. The installer was very thorough and kept the mess to a minimum. He cleaned everything up so was ready to be used right away. Couldn’t have asked for better service.
Bath Planet of Des Moines
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Reviewed in July 2021
Timing from when I received the quote and scheduling the work was just as Mr. Skinner told me. The contractors came with the list of installation and removal of old equiptment that Mr Skinner and I put together with a smile and the attude of getter done. Thank you again BCarney
Sears Home Services - Kansas City HVAC
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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.

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.

Monolithic slabs don’t require insulation, but many homeowners choose to have their contractors install insulation under the slab during construction. This can help improve home efficiency even more and keep indoor temperatures more stable. Slab foundations are more energy-efficient than uninsulated crawl spaces and basements, and insulated slab foundations are more energy-efficient than insulated crawl spaces and basements.

Yes, cold walls are a common indicator of poor or inadequate insulation, especially if the walls feel significantly colder than the air in the room. This suggests that heat from your furnace is escaping rather than being retained. The issue could be that the walls have no insulation, or that the existing insulation is old or has been damaged by water, moisture, or pests. Your best course of action is to hire a professional to investigate. An insulation contractor can determine if you need to add or replace insulation and can often perform the work without creating large holes in your drywall. If you suspect the problem might also be related to your heating system's performance, an HVAC technician can take a closer look.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

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