Should you remove old insulation before adding new insulation?

• <div><p>You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.</p><p>However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.</p></div>

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Q: Do you need a vapor barrier when drywalling a garage?

• <div><p>If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.</p></div>

Q: How is batt, rolled, or reflective insulation professionally installed?

• <div><p>Insulation is professionally installed by measuring spaces, cutting materials to fit correctly, and placing them without gaps for optimal thermal resistance.</p></div>

Q: How long does rockwool insulation last?

• <div><p>Rockwool insulation can last up to 100 years, but just how long this insulation lasts in your home depends on how well it's maintained. Poorly installed insulation may last only 30 years, so be sure to regularly inspect your home's insulation for water damage, settling, and pests to give your insulation the best chance of having a long lifespan.</p></div>

Q: Should you put plastic over insulation in basement walls?

• <div><p>A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.</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 September 06, 2026

Reviewed in September 2026
Justus and John of Mountain Tree Service did a great job removing the 65 ft high pine tree that was only a few feet from our house without ever touching the house. They were great at communicating with us and came very promptly after we contacted them. When they showed up they got straight to...
Mountain Tree Service
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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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Doorbell Installation questions, answered by experts

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

You do not always need to remove old insulation before adding new. If the existing insulation is in good condition—not wet, physically damaged, moldy, or infested with pests—you can add new insulation directly on top of it for a compounding effect. You can also mix different types, such as adding blown-in insulation around existing fiberglass batts.

However, removal is recommended if the old insulation is compromised by water damage or pests. You should also remove it if you plan to install a different type of insulation, like switching from roll or batt insulation to spray foam. If the existing insulation is very old or damaged, you will likely get more benefit from removing it and starting fresh.

Insulation is professionally installed by measuring spaces, cutting materials to fit correctly, and placing them without gaps for optimal thermal resistance.

Rockwool insulation can last up to 100 years, but just how long this insulation lasts in your home depends on how well it's maintained. Poorly installed insulation may last only 30 years, so be sure to regularly inspect your home's insulation for water damage, settling, and pests to give your insulation the best chance of having a long lifespan.

A plastic vapor barrier should completely cover your basement to prevent water from penetrating through the walls. This typically goes before installing insulation to prevent moisture from building up and becoming trapped on the inside of your insulation, where it can collect and lead to mold damage. Installing insulation after the vapor barrier allows for any moisture to exit the walls for better ventilation.

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