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>

Can you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</p></div>

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Last update on March 20, 2026

Reviewed in March 2026
Thank you Paul for assisting me with my new flooring purchase and install of 3AQUACORE XL 9"X72"X8MM EIR. As I am aware this flooring is made for Busenbark. My installer was a 10+ and great to work with. He installed Living Room, Dining Room and bathrooms. He was careful with items in the home...
Busenbark Carpet Inc
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Reviewed in January 2026
Randy and crew arrived and installed new storm door and front door on front of house. They also installed new French doors in place of our old sliding glass doors downstairs. Loved the work.
Power 2 Construction & Remodeling
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Reviewed in April 2025
Gaven did excellent work installing an aluminum railing and a new set of stairs for my deck.
Bell's Carpentry & Construction
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Reviewed in February 2025
I hired Mr. Bell to install some kitchen cabinets at my cabin on the lake. He very professional and his workmanship is top notch. Showed up on time and his installation price was more than fair. Definitely would hire him again.
Bell's TrimWork
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Reviewed in June 2023
Ethan Crocker and crew have done repairs and complete roof installation on two different storm damages in two years. If quality, integrity,work ethic, and good communication are important to you, you need look no farther. I will recommend to all my family and friends.
Direct Contractors, LLC
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Reviewed in July 2021
The crew did an excellent job. I was highly satisfied with the septic system they installed and the clean up that followed. I highly recommend this company. Bill Boyd
Ross Contractors LLC
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Reviewed in June 2021
Easy to work with and Did a great installing our new door.
Elite Overhead Doors, LLC
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Reviewed in June 2021
Our sales person Kirk was extremely knowledgeable and even went over ways that we could combine two windows into one in order to save money on our large project.. This suggestion actually created an impressive look that both my husband and I LOVE and havenâ t stopped commenting on since the...
Universal Windows Direct of St Louis
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Reviewed in June 2020
Had a bathroom install in basement. I got a competitive bid, quick start time, and they listened to what I wanted and did it well! He also responded well to email or text and was easy to communicate with. I would defitely hire them again for remodeling projects in the future!
Grace Renovations, LLC
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Reviewed in May 2020
Not only did he install my microwave but he also removed a rose bush that I needed removed!
Cooper's Handyman Services, LLC
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Doorbell Installation questions, answered by experts

Yes, usually you will need some kind of vapor barrier on the exterior walls when the framing is attached to concrete and masonry surfaces.

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.

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.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

Mineral wool has an excellent life expectancy of up to 50 years, provided it's kept dry and free of pests. Compared to fiberglass, with a life span of 20 to 30 years, mineral wool stacks up well for long-term cost savings. Sheep wool maintains a similar life span to fiberglass, while estimates for hemp wool insulation life expectancies are all over the board, ranging anywhere from 20 to 100 years.

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