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: Should ductwork be wrapped in insulation?

• <div><p>Ductwork should be wrapped in insulation in certain locations. This includes unconditioned interior parts of the home, such as attics, crawl spaces, basement ceilings, and between floors. Duct joints should also be insulated since they're more likely to leak air than other parts of your system. Building codes in some areas also require ductwork to be insulated. </p></div>

Q: What happens if you don't install a vapor barrier?

• <div><p>While not every wall requires a vapor barrier, if you do need one and don&rsquo;t install it, moisture can get between the walls of your home. This can lead to water damage from mold growth or rot, and the excess moisture could also attract pests, including termites, cockroaches, or ants.</p></div>

Q: Can I install insulation behind drywall myself?

• <div><p>Yes, you can <a href="https://www.angi.com/articles/how-to-install-insulation.htm">install insulation</a> behind drywall yourself, but only if your walls are not finished. If your studs are exposed, installing fiberglass insulation in roll or batt form is very straightforward and just requires a few tools and some safety equipment. If your walls are already finished and you&rsquo;re looking to add insulation, it&rsquo;s better to hire a professional, as you&rsquo;ll likely need blown-in insulation, which can be dangerous to work with and a challenge to get into the proper areas in your wall voids.</p></div>

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Verified Reviews for Doorbell Installation pros in Eureka, MT

*The Angi rating for Doorbell Installation companies in Eureka, MT 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 Eureka, MT 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 December 23, 2025

Reviewed in December 2025
Dynamic Plumbing was quick to respond, personable and provided options to get me the deal I was happy with. I would 100% recommend and hire again!
Dynamic Plumbing LLC
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Reviewed in August 2025
Good product but the absolute worst customer service.
Montana Dock and Deck INC
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Reviewed in June 2024
Luke's Service & Repair is excellent! Luke is very knowledgeable, professional and prompt. I highly recommend him!!
Luke's Service and Repair LLC
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Reviewed in November 2023
Hired company to tear down and replace wood patio cover. I expected the same style of patio. However, I was surprised when a better, more architectural design was presented, at no extra charge. Lumber was hauled away promptly. Patio installed and neatly painted. Honest people who do a great job....
J&M Home Inspections
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Reviewed in May 2023
They were really nice and did a quality work. They had a reasonable price and were on time. They were respectful of my property.
Handy Homes
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Reviewed in April 2023
Clint really cares about what he is providing and matches it up with the needs of the client.
Post Water Works LLC
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Reviewed in May 2021
They are hard working, personable, professional and great painters. They stand by their work, as they should for their work is amazing!! Our home looks like a million dollars and they are more than fairly priced and the quality is Extrodinair.
Blue Skies Painting
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Reviewed in May 2021
Absolutely fabulous! Renewal by Andersen did a great job. The windows are amazing and the workmanship is top notch. Waylin’s installation crew was fast, professional and a pleasure to work with. They installed the windows cleanly, and you couldn’t tell they were even there after all was said and...
Renewal by Andersen of Montana
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Reviewed in October 2019
Very thorough,took time to get the preparation work done, work done with care and protection for the house, no mess for me to clean up, delightful personality and very professional work completed, timely,highly recommend without reservation
Darryl Johnson Services
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Reviewed in August 2016
Marty was very professional and methodical while trying to figure out what was wrong my hot water tank. He didn't want to have the tank on less he had to, come to find out, the previous plumber installed a line wrong. Problem solved, I will definitely call him again for my plumbing needs.
The Plumbing Master, LLC
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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.

Ductwork should be wrapped in insulation in certain locations. This includes unconditioned interior parts of the home, such as attics, crawl spaces, basement ceilings, and between floors. Duct joints should also be insulated since they're more likely to leak air than other parts of your system. Building codes in some areas also require ductwork to be insulated.

While not every wall requires a vapor barrier, if you do need one and don’t install it, moisture can get between the walls of your home. This can lead to water damage from mold growth or rot, and the excess moisture could also attract pests, including termites, cockroaches, or ants.

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, you can install insulation behind drywall yourself, but only if your walls are not finished. If your studs are exposed, installing fiberglass insulation in roll or batt form is very straightforward and just requires a few tools and some safety equipment. If your walls are already finished and you’re looking to add insulation, it’s better to hire a professional, as you’ll likely need blown-in insulation, which can be dangerous to work with and a challenge to get into the proper areas in your wall voids.

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