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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Q: How long does it take to install or upgrade insulation?

• <div><p>The time required for insulation installation can range from a few hours to a few days, with most projects taking 1-3 days to complete. The final duration depends on the project's size and complexity, the area size, and the type of insulation being installed.</p></div>

Q: Is it worth insulating ductwork in a crawl space?

• <div><p>Yes, insulating ductwork in a crawl space is a worthwhile investment, especially if you live in a colder climate or run your air conditioning for most of the year. Uninsulated ducts can lose up to 30% of their heating and cooling efficiency, which can significantly impact your electricity bill. The project is a relatively small investment and typically only takes a few hours. It's a particularly simple add-on if you are already hiring someone to insulate the entire crawl space. An added benefit is that insulated ducts put off less hot or cold air, making them less attractive to pests.</p></div>

Q: Can you install a radiant barrier under insulation?

• <div><p>It&rsquo;s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat. </p></div>

Q: Does a monolithic slab need insulation?

• <div><p>Monolithic slabs don&rsquo;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.</p></div>

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Verified Reviews for Doorbell Installation pros in Marcus, IA

*The Angi rating for Doorbell Installation companies in Marcus, IA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

*The HomeAdvisor rating for Doorbell Installation companies in Marcus, IA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

Last update on November 22, 2025

Reviewed in November 2025
Install seemed to go OK, crew was great - only reason I?m giving two stars. Communication with this company was horrendous. Scheduling my initial measurements was hilarious, because their staff doesn?t understand that I work on call and my schedule can change - I would give them at least 24...
1-800-HANSONS (Sioux Falls Windows)
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Reviewed in October 2024
I hired Cornbelt Concrete & Construction to pour a basement foundation, basement floor, garage footings, garage floor, and driveway approach for my new house and garage. They were professional, prompt, and did a high quality job! I would recommend them to anybody!
Cornbelt Concrete and Construction, LLC
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Reviewed in February 2024
They showed up, explained in detail how the carpet would be installed. They ran me through the steps of seaming carpet, stretching and finishing tips. I would hire this crew again for future projects!
Brimm Bros. Flooring
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Reviewed in November 2023
Brian helped me redesign the layout of my kitchen, installed new cabinets, and an island.
Kitchen Design Guys TN
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Reviewed in February 2023
Nov 2021- roof replaced. There were so many nails around my yard I lost count. Dec 2021 parts of said roof on two of the 3 structures blow off due to faulty installation. Debris all over the entire neighborhood, nails all over after we just cleaned up what was left after install, shingles in...
1-800 Hansons
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Reviewed in January 2023
Felt confident that they were the right ductwork company for us! Arrived on time and never stopped working the entire time they were here. I was able to be in the house while they were here so I witnessed their work ethic in doing a quality job for us. Really felt they went the extra mile in...
Swick's Duct Cleaning
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Reviewed in October 2021
The contractor was always in contact with me and did a beautiful job.
Gonzalez Contractors LLC
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Reviewed in October 2021
AGR is the company that we decided to use after a huge storm blew through and destroyed our roof, gutters, and siding. Zach came out with the insurance adjustor and made sure to point out every little detail that needed to be addressed. Zach took tons of pictures for proof, all while stating it...
AGR Roofing & Construction
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Reviewed in April 2021
We had no issues with the crew. They do a good job, do their best to make you happy. They installed new stairs at my mother's and did a great job. One of them remembered my mother on Thanksgiving and brought her a plate of food knowing her family was down with covid and she was on her own that...
Dominguez Construction 3:16
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Reviewed in February 2018
Installed windows, doors, siding extensive remodeling work for us. Prompt, accurate, willing to add on to initial work. Good communication as well. 5 stars +++
Brunst Construction
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Doorbell Installation questions, answered by experts

The time required for insulation installation can range from a few hours to a few days, with most projects taking 1-3 days to complete. The final duration depends on the project's size and complexity, the area size, and the type of insulation being installed.

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, insulating ductwork in a crawl space is a worthwhile investment, especially if you live in a colder climate or run your air conditioning for most of the year. Uninsulated ducts can lose up to 30% of their heating and cooling efficiency, which can significantly impact your electricity bill. The project is a relatively small investment and typically only takes a few hours. It's a particularly simple add-on if you are already hiring someone to insulate the entire crawl space. An added benefit is that insulated ducts put off less hot or cold air, making them less attractive to pests.

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

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.

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