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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*The Angi rating for Doorbell Installation companies in Glasgow Village, MO 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 January 11, 2026

Reviewed in January 2026
Austin Fish and Coe were both great to work with. This was our first time ever having windows installed and they made the process easy. There were only a few minor issues but they both jumped in quickly to make sure everything was resolved. Over all we are happy with our new windows.
Four Seasons Home Products
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Reviewed in June 2025
I asked the guys to install an egress wi dow in a basement bedroom. They did exactly as I asked and worked efficiently. They showed up when they said they would and communication was great from estimate to finish! (Drop down option says kitchen remodel for work done only because window...
Enyeart Construction
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Reviewed in November 2023
We recently found out that our tankless heater was installed improperly. When we called to ask about it he tried to turn it around on us and argued that the manufacturers requirements were not his even though when you look online there are multiple sources that say you must follow certain...
D's Service Co
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Reviewed in January 2023
He did a good job with putting on a storm door. All of the parts were there, he was very professional and even added a 2x4 to my threshold to make sure it completely fit.
Adam's Handyman Services
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Reviewed in August 2022
Trenton was very professional, made sure we were happy with the job, and communicated very well. Will definitely hire him for future projects!
Straight Edge FLAT Work
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Reviewed in January 2022
Donnie is always on-time and prepared for any task I might discover. He installed the door and it looks and works great. In addition, he did some minor work in the laundry room and installed handicap accessories in the bathroom. Fair wages for excellent work. I would highly recommend his...
Hilltop Home Repairs
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Reviewed in June 2021
After calling Zach Bahner, Certified Inspector for Foundation Recovery Systems to come for an inspection, he came to our home to inspect an area of concern that needed attention. He was very professional, knowledgeable, and thorough in his inspection and explained to us about the company and...
Foundation Recovery Systems
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Reviewed in October 2020
Very professional. Removed old siding and installed new insulated siding. Helps to improve efficiency and reduce electrical costs. Extremely happy.
Continental Siding Supply, Inc.
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Reviewed in January 2016
The windows are great and the installers did a great job. The clean up was excellent and we are very satisfied. It definitely made a difference in the energy efficiency and made the house look much better and increased the value of the home! <br />
Continental Siding Supply
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Reviewed in January 2016
The windows are great and the installers did a great job. The clean up was excellent and we are very satisfied. It definitely made a difference in the energy efficiency and made the house look much better and increased the value of the home!
Continental Siding Supply, Inc.
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Doorbell Installation questions, answered by experts

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.

Air duct insulation typically lasts for 10 to 15 years or even longer, depending on the material and maintenance. It's important to conduct periodic inspections to check for signs of deterioration, such as water damage, tears, or general wear. If you find any of these issues, it may be time for repairs or a full replacement. You might also consider upgrading your insulation even if it's in good shape to improve your home's energy efficiency and enhance your HVAC system's performance with newer, more effective materials.

The best type of insulation for your home depends on your specific needs, climate, and the area you are insulating. For new construction, structural insulated panels are a highly energy-efficient option that is easy to install during the building process. In very warm climates, reflective insulation can be a cost-effective choice. For cold climates, fiberglass is an excellent option due to its high R-value and resistance to settling over time. Spray foam works well in humid environments because of its moisture-resistant properties. For standard attics, loose-fill, spray foam, or blown-in insulation are all suitable options.

The life span of fiberglass insulation can be as long as 80 to 100 years, but because of changing building codes, it’s best to get your insulation checked every 10 to 15 years. Signs of degrading fiberglass insulation include bits of batts on the floor or batts detached from frames. Having optimal, healthy insulation in your home will improve its energy efficiency, lowering your monthly bills.

When installing board and batten siding, make sure there is wall sheathing and a moisture-resistant barrier installed. Behind that sheathing should be plywood or OSB for you to nail the boards and battens into. If there isn’t plywood or OSB, you can install vertical furring strips at 1½- to 2-foot intervals to nail the boards and battens to.

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