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>

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Q: How long does blown-in insulation last?

• <div><p>At a minimum, blown-in insulation lasts 20 to 30 years. Cellulose and sheep&rsquo;s wool come from natural materials, so they likely max out at around 30 years. Fiberglass and rockwool feature artificial materials that boast lengthy lifespans, up to 50 years, or even longer in some cases. As always, this timeline assumes you don&rsquo;t run into any issues, such as flooding or mold, that shorten the lifespan.</p></div>

Q: Do siding installation services include insulation options?

• <div><p>Yes, many professionals offer insulation options, such as insulated siding (including insulated metal siding), to improve your home's energy efficiency.</p></div>

Q: Do installations include insulation?

• <div><p>Yes, many services include adding insulation for energy efficiency. Confirm with your contractor.</p></div>

Q: Should I insulate my garage ceiling?

• <div><p>If you plan to heat or cool your garage, you&rsquo;ll need to <a href="https://www.angi.com/articles/how-save-money-garage-insulation.htm">insulate the garage ceiling</a>. Insulating your garage ceiling will make your garage much more energy efficient and save on heating and cooling costs. Not only does insulation make your garage more energy efficient, it helps reduce noise and can extend the life of your garage roof. You can use fiberglass, cellulose, mineral wool, or spray foam insulation for this project.</p></div>

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Insulation questions, answered by experts

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.

At a minimum, blown-in insulation lasts 20 to 30 years. Cellulose and sheep’s wool come from natural materials, so they likely max out at around 30 years. Fiberglass and rockwool feature artificial materials that boast lengthy lifespans, up to 50 years, or even longer in some cases. As always, this timeline assumes you don’t run into any issues, such as flooding or mold, that shorten the lifespan.

Yes, many professionals offer insulation options, such as insulated siding (including insulated metal siding), to improve your home's energy efficiency.

Yes, many services include adding insulation for energy efficiency. Confirm with your contractor.

If you plan to heat or cool your garage, you’ll need to insulate the garage ceiling. Insulating your garage ceiling will make your garage much more energy efficient and save on heating and cooling costs. Not only does insulation make your garage more energy efficient, it helps reduce noise and can extend the life of your garage roof. You can use fiberglass, cellulose, mineral wool, or spray foam insulation for this project.

The La Plata, MO homeowners’ guide to insulation services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

Deane Biermeier
•
May 3, 2026May 3, 2026
How Much Does Ceiling Insulation Cost? [2026 Data]
Your home's ceiling insulation cost will depend on several factors, including the project size, the type of insulation you use, and the R-value.
Melissa Graham
•
May 30, 2026May 30, 2026
How Much Does It Cost to Insulate a Basement? [2026 Data]
The cost to insulate a basement varies based on materials, size, and other factors, as well as how much of the work you wish to perform yourself.
Paige Bennett
•
May 2, 2026May 2, 2026
How Much Does It Cost to Rent a Blown-In Insulation Machine? [2026 Data]
Learn the key factors that influence the cost of renting a blown-in insulation machine.
Scott Dylan Westerlund
•
Apr 9, 2026Apr 9, 2026
What Is Dryer Vent Insulation? Should You Insulate It?
Learn how to decide if your home needs dryer vent insulation to protect your vent from drafts and moisture that can make your energy usage less efficient. Poorly ventilated dryer vents also increase mold risks!
C.E. Larusso
•
May 3, 2026May 3, 2026
How Long Does Insulation Last? A Comprehensive Guide to Replacing Your Home's Insulation
If your home’s temperature is uncomfortable or your energy bill is spiking, you should check your insulation. We'll help you find out if you should replace it.
Allie Ogletree
•
May 3, 2026May 3, 2026
Should You Remove Old Insulation Before Adding New Insulation?
Removing old insulation may be necessary for upgrading your insulation. Keep reading to see if you should remove old insulation before adding new insulation.