How do I add insulation to existing walls?

• <div><p>If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install <a href="https://www.angi.com/articles/blown-in-insulation.htm">blown-in insulation</a>. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than <b>$100</b>. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.</p></div>

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>

How do I choose the right type of insulation?

• <div><p>Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you <a href="https://www.angi.com/articles/r-you-using-right-type-home-insulation.htm">choose the right insulation</a>. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.</p></div>

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

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Last update on July 19, 2026

Reviewed in July 2026
I had all of my windows replaced along with 2 sliding doors, No more leaking windows, my home remains comfortable in summer and winter, I'm no longer leaking my coolness or warmth through the window, the installation crew was great , very professional and was able to complete the install in...
Renewal by Andersen of Montana
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Reviewed in January 2025
We have been using Happy Home Handywork for the last 5 years on all our Business and personal remodels. Jason is a pleasure to work with from his initial consultation until the final result. Jason listens carefully to our needs and preferences while also providing expert guidance. Jason is...
Happy Home Handy Work
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Reviewed in November 2024
We hired these guys to refinish a deck and replace five large picture windows. They were very responsive to our initial inquiry, were always on time and worked hard to get the job done. Work seems to be great quality and they were professional and courteous. We will definitely use them again...
Rock Solid Carpentry
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Reviewed in February 2023
Stephen Miller is a very skilled excavator. He is honest, and I will have him do all my excavation projects!
Rocking MT Excavation LLC
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Reviewed in January 2023
Super easy to work with and prompt
Orca Fireplace, LLC
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Reviewed in July 2021
Very professional and detailed in his reports. His prices are amazing. I would hire him again for sure. I paid $160 MORE for a home inspection earlier this month through someone else and it wasnâ t nearly as detailed as this one.
Gunstock, LLC
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Reviewed in May 2021
I was having trouble finding someone who could fit me into their schedule. Jordan Solar gave me a quick call back and worked me in to add and relocate switches and plugs in some new walls and add a couple of circuits for a renovation. Excellent work, excellent customer service at a great price....
Jordan Solar and Electric
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Reviewed in February 2016
A great locally owned business. Third generation family business. The owner came out to prepare the proposal and supervised the install. No sales agent commission saves money. They showed up when they said they would. The proposal was the best and there were no surprises when the job was done. A...
Heritage Home Services
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Reviewed in April 2013
On the afternoon of April 3, 2013, the outer glass on the lower oven door on my Maytag range spontaneously shattered. I live in the Mission Valley of NW Montana, many miles from appliance repair services. After an internet search and a call to Maytag, I called Allbrands Appliance Service in...
All Brands Appliance Service, Inc.
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Doorbell Installation questions, answered by experts

For your safety, you should always wear a mask when cutting batts of fiberglass insulation. We also recommend wearing eye protection, safety gloves, and long sleeves to protect your skin. Properly suiting up helps you avoid several fiberglass issues, such as cuts from the tiny shards of glass and inhaling small bits of fiberglass.

According to a report from Energy.gov, radiant barrier installations can save between 5% and 10% on your energy bill each month that your HVAC cooling is in operation. That fact can mean savings of up to more than $325 per year for homes that experience frequent direct sunlight and high summer temperatures.

If you need to insulate behind finished walls, the best option will likely be to have an insulation professional install blown-in insulation. The installation requires small holes cut in your wall, after which the installer can blow loose-fill insulation into the void. After the installation, you’ll have minor drywall patching, which shouldn’t cost more than $100. Compared to ripping down the existing drywall, using a different type of insulation, and replacing and finishing the drywall, this should save you hundreds or even thousands, depending on the size of the room you’re insulating.

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.

Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you choose the right insulation. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.

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