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 duct insulation last and when should it be replaced?

• <div><p>Air duct insulation typically lasts for 10 to 15 years or even longer, depending on the material and maintenance. It's important to conduct periodic inspections to check for signs of deterioration, such as water damage, tears, or general wear. If you find any of these issues, it may be time for repairs or a full replacement. You might also consider upgrading your insulation even if it's in good shape to improve your home's energy efficiency and enhance your HVAC system's performance with newer, more effective materials.</p></div>

Q: How does a radiant barrier work?

• <div><p>In addition to adding insulation to your attic, you may want to add a radiant barrier. <a href="https://www.angi.com/articles/how-does-radiant-barrier-work.htm">A radiant barrier works</a> by using reflective material, such as foil, on the attic floor. As heat penetrates the roof and enters the attic, the radiant barrier reflects the heat upward and back through the roof. If you receive a lot of direct sunlight on the roof, using both a radiant barrier and insulation in your attic can provide significant benefits.</p></div>

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's the best insulation for a garage?

• <div><p>Fiberglass is considered a favorite garage insulation choice due to its combination of affordability, ease of installation, and overall effectiveness. Fiberglass provides good thermal resistance, helping regulate garage temperatures and minimize heat transfer. Additionally, fiberglass is moisture-resistant, reducing the risk of mold or mildew formation. </p></div>

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Verified Reviews for Doorbell Installation pros in Tripp, SD

*The Angi rating for Doorbell Installation companies in Tripp, SD 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 Tripp, SD 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 July 29, 2026

Reviewed in July 2026
They were are friendly and let us know right away about one of the trees and how bad it was. If they couldn't come out because of rain they would call and let us know. They gave us a time they would be there if late they would call. Great job would hire again.
TNT Tree Service
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Reviewed in August 2025
The work was done fast and efficient. They were very friendly and polite. I was very satisfied. Job well done.
605 Firewood and Tree Services LLC
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Reviewed in June 2023
Jake did a great job cleaning up the outside of our old farmhouse! Very friendly and thorough. The siding looks like new!
Pressure Pros
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Reviewed in March 2023
Showed up when they said they would.
Daggett Construction Services, LLC
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Reviewed in June 2022
Very knowledgeable Nd straight forward. Very friendly and helpful.
J W Construction, LLC
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Reviewed in February 2021
They were very fast, and done a great job. The owner Dean seemed very knowledged.
Positive Roofing & Gutters, LLC
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Reviewed in May 2014
They found a problem where others didn't. They are highly recommended on Angie's List website. I was having problems with air conditioner. They came out and they couldn't find anything and then the guy came back in a little bit of time. After 10 minutes, he got down the road and said he...
Riverside Heating & Cooling
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Reviewed in September 2013
Super - showed up a few days after I called - walked through everything with me in the house, explained the procedure, the functionality of the systems available - and his recommendation. and systems available - clearly. Called me a few days later with an estimate. <br />
HAASE HEATING & COOLING
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Reviewed in September 2013
Super - paint is great and the plumbing was easier than I thought it would be because of the advise and fixture I got at the hardware store. <br />
SCOTLAND HARDWARE
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Doorbell Installation questions, answered by experts

Air duct insulation typically lasts for 10 to 15 years or even longer, depending on the material and maintenance. It's important to conduct periodic inspections to check for signs of deterioration, such as water damage, tears, or general wear. If you find any of these issues, it may be time for repairs or a full replacement. You might also consider upgrading your insulation even if it's in good shape to improve your home's energy efficiency and enhance your HVAC system's performance with newer, more effective materials.

In addition to adding insulation to your attic, you may want to add a radiant barrier. A radiant barrier works by using reflective material, such as foil, on the attic floor. As heat penetrates the roof and enters the attic, the radiant barrier reflects the heat upward and back through the roof. If you receive a lot of direct sunlight on the roof, using both a radiant barrier and insulation in your attic can provide significant benefits.

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.

Fiberglass is considered a favorite garage insulation choice due to its combination of affordability, ease of installation, and overall effectiveness. Fiberglass provides good thermal resistance, helping regulate garage temperatures and minimize heat transfer. Additionally, fiberglass is moisture-resistant, reducing the risk of mold or mildew formation.

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.

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