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>

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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*The Angi rating for Doorbell Installation companies in Scio, OH 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 01, 2026

Reviewed in July 2026
Hired this guy on 3/16/26. Gave him 10k down for AC and Propane furnace installation. On 7/1/26 this is as far as he has gotten. Never shows up when he says. Only stays 2-3 hours when he does show. Tries to gaslight me for his problems. Had to pay $1723.00 cash for a replacement AC unit because...
Vohs Heating Cooling and Appliances
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Reviewed in February 2025
We got 2 sliding glass doors installed by Ohio State Windows. It’s a great door and I was given an honest price. They were able to install quickly! I enjoyed Ernie and his team. If I ever need windows or doors again I know who I’m calling.
Ohio State Windows
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Reviewed in January 2024
Adam RUEGG with BECH Electric came out same day as my scheduled appointment was, in 13 degree weather, asked what I needed done to have electric to use at my address to use wirh a 20'FT. X 10'FT. Awning that had a volted motor to open and close, that needed proper electric installs outdoors, got...
Beck Electric, Generators & Plumbing
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Reviewed in May 2022
Bill and his crew did such a nice job on not only my deck but also some doors I wanted installed. Bill always got back to me when I called and they cleaned up when they left. I would highly recommend Bill for your next project. I know I will. Thank you Bill
Bill Weaver Construction
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Reviewed in November 2021
You have found the plumber and installer you are looking for. They do excellent work, as promised, when promised. Look no further, you have found exactly what you need.
Hains Plumbing and Drain Service
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Reviewed in May 2021
He brought a ladder and all necessary installation switches and tools and a pull string and fixed my fan for 60.00. I will hire him again for more projects
Dallas Handyman
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Reviewed in January 2020
Dwight Miller (DMiller Mechanical) came to our house to give us a quote on replacing our 20 year old geothermal furnace that we’ve been pouring money into for repairs and also to replace our 20 year old hot water tank. He was 1 of 3 contractors invited to price his services He did a detailed...
D. Miller Mechanical, LLC
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Reviewed in July 2019
They did a good work. We have 2 systems installed by him.
Reichman's Networking Solutions
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Reviewed in October 2017
Project: Powder room renovation, install hardwood floors in adjacent hallway, drywall in two other rooms. So happy with the way everything turned out. Powder room is my favorite in the house now, Looking forward to working with Jamie on the next project!
JPK Contracting, LLC
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Reviewed in May 2016
Their work was outstanding. These are fully functional shutters that open and close so they need to fit with very close tolerances. The shutters fit like a fine pair of gloves. The paint was done to perfection with no signs of runs or missed spots and the color matched perfectly. The copper caps...
Vixen Hill Manufacturing Co
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Top-Rated Doorbell installation pros in Scio - Updated Nov 2026

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Doorbell Installation FAQs, answered by experts

The life span of insulation is between 20 and 100 years. At that time, existing insulation can fall victim to gravity, resulting in compression, which reduces its insulating protection or R-value. If you can't simply add more insulation over the existing material, removing the old to increase the effectiveness of the new can reduce your energy bills and make the project worth the time and money investment.

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.

Reflective and high R-value batt or roll insulation are often considered energy-efficient, offering significant thermal resistance benefits.

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.

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.

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