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: What is the life expectancy of wool insulation?

• <div><p>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. </p></div>

Q: What is the best insulation for air ducts in the crawl space?

• <div><p>Mineral wool wraps are the most affordable and effective insulation for crawl space ducts. They are easy to cut, last for a long time, and healthier for humans. Meanwhile, fiberglass wraps are cheaper but more hazardous and difficult to handle. If you do choose to use a fiberglass wrap, make sure you are wearing long sleeves and wear proper protective gear.</p></div>

Q: What insulation generally has the highest R-value?

• <div><p>Structural insulated panels and rigid foam boards have the highest R-value of any insulation that contractors commonly use, with R-values reaching up to around 8.0. These types of insulation are best in extremely cold climates, but they&rsquo;re generally preferred for new construction, as they can be challenging to retrofit. Blown-in and loose fill insulation provide the next best insulative value, provided the installation is done properly. It&rsquo;s important to choose an insulation type that meets your needs based on climate, as maximizing R-value may not always be financially worthwhile if you live in a moderate climate.</p></div>

Q: How much does a radiant barrier cost?

• <div><p>The <a href="https://www.angi.com/articles/radiant-barrier-cost.htm">cost to install a radiant barrier</a> ranges from $700 to $2,800, depending on the size of your roof and the type you choose. Most people pay an average of $1,700 to install a radiant barrier. Foil options, both single- and double-sided, cost between $0.10 and $0.90 per square foot, while spray-on options start at $0.60 and go all the way up to $1 per square foot&mdash;which can add up quickly.</p></div>

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Verified Reviews for Doorbell Installation pros in Stanley, ND

*The Angi rating for Doorbell Installation companies in Stanley, ND 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 Stanley, ND 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 January 20, 2026

Reviewed in January 2026
Awesome 🤩 was/is James Nelson, Design Specialist with American Waterworks, out of the Fargo, ND office was absolutely wonderful to work with. (Really this Company has impressed us from the beginning!) always quick to respond and very patient…. There was zero pressure …. no pushy sales tactics...
American Waterworks
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Reviewed in October 2025
I recently had the pleasure of hiring A&A Sparkle and Shine Cleaning LLC, and I was thoroughly impressed by their professionalism and attention to detail. The team arrived promptly, worked efficiently, and left every area spotless and refreshed. Their commitment to high-quality service and...
A&A Sparkle and Shine Cleaning LLC
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Reviewed in November 2024
Yikes, why can't I put 0 stars?!? I rue the day this guy and his crew ever stepped foot on my property in Stanley, ND. They didn't put paper or plastic down at all and got mud, texture and paint all over fixtures, doors, windows, and new flooring. Plus the fact that they installed the...
That Guy Construction
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Reviewed in February 2024
I got the pleasure of working with the owner of Dahly Services for over a year while I was managing a townhome complex in Stanley, ND. He was by far one of the best contractors Iâ ve worked with. His work ethics were extremely professional and he had the best work integrity. I never felt the...
Dahly Services LLC
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Reviewed in October 2022
Cody is very easy to work with. Shows up when he says heâ s will and does a great job in a timely manner. Would recommend to anyone. He worked on multiple projects on my whole home remodel and his work is unmatched!
Little Deep Creek Services, LLC
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Reviewed in January 2021
Brad is friendly, very professional, and prompt. He will work with you to get the job dine quickly. His prices are very reasonable. I was very, very pleased with him and his services!!
JHW Services, LLC
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Reviewed in November 2020
I have already asked Joe to come back and do even more projects for us! They do fantastic work!
Joe Gullickson Contracting
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Reviewed in December 2018
Very rapid on estimates and got an electrical contractor pronto... installed unit on initial date. Works well.
Forced Air Heating And Air Conditioning, Inc.
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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.

Mineral wool wraps are the most affordable and effective insulation for crawl space ducts. They are easy to cut, last for a long time, and healthier for humans. Meanwhile, fiberglass wraps are cheaper but more hazardous and difficult to handle. If you do choose to use a fiberglass wrap, make sure you are wearing long sleeves and wear proper protective gear.

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.

Structural insulated panels and rigid foam boards have the highest R-value of any insulation that contractors commonly use, with R-values reaching up to around 8.0. These types of insulation are best in extremely cold climates, but they’re generally preferred for new construction, as they can be challenging to retrofit. Blown-in and loose fill insulation provide the next best insulative value, provided the installation is done properly. It’s important to choose an insulation type that meets your needs based on climate, as maximizing R-value may not always be financially worthwhile if you live in a moderate climate.

The cost to install a radiant barrier ranges from $700 to $2,800, depending on the size of your roof and the type you choose. Most people pay an average of $1,700 to install a radiant barrier. Foil options, both single- and double-sided, cost between $0.10 and $0.90 per square foot, while spray-on options start at $0.60 and go all the way up to $1 per square foot—which can add up quickly.

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