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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*The Angi rating for Doorbell Installation companies in Lafayette, CA 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 August 14, 2025

Reviewed in August 2025
Elliot and sons has been installing our products on homes for quite some time. We are extremely satisfied with their abilities to get the job done right. I have never had a complaint or an inquiry. They are at the very top of my list of top installers in the country. Any work they do is quality...
ELLIOTT & SON ROOFING
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Reviewed in July 2025
Eagle installed a smart garage door opener at our place, and it?s been amazing. I can control it from my phone and never worry about leaving the door open again. The install was clean and quick. Couldn?t ask for better.
Eagle Automatic Gate & Door
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Reviewed in April 2025
They know what to do and are done all installation smoothly and efficiently.
Hill's General Plumbing Services
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Reviewed in January 2025
I NEEDED A GOOGLE NEXT DOORBELL INSTALLED AND I CALLED VERNOUS INC ( AMIR ) TOOK THE INFORMATION AND SENT ( MAHDI) TO DO THE JOB. MAHDI HAD TO RESEARCH THE NEW DOORBELL AND THE CHIME UNIT. THE RESULTS WERE THE CHIME WAS OLD AND NOT COMPATIBLE WITH THE NEXT DOORBELL. I ORDERED A...
Vernous Inc.
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Reviewed in January 2025
Jesus installed an 86 inch TV and also installed the receiver and hooked up speakers. He was polite, professional and very reasonable. I would hire Jesus again anytime. Excellent service.
mvp construction and remodeling
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Reviewed in February 2024
Came by to give me a quote to install my level two EV charger. Quote was extremely reasonable, and they said they could do the install right there and then. It was awesome. I will absolutely hire them again.
Single Line Electric
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Reviewed in November 2023
Prompt response. Quick quote and did great work installing an attic pull down ladder. Will hire again.
Live Oak General Builder, Inc.
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Reviewed in June 2023
Communication while waiting for doors was not good but windows and installation was great.
Brothers Home Improvement, Inc.
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Reviewed in June 2023
Eli installed the unit and was great!
All Water Heaters & Plumbing LLC
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Reviewed in October 2022
Such an easy process! The installers were very fast and efficient and showed fantastic teamwork! Thanks again.
AMM Fencing
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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.

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.

Rockwool insulation can last up to 100 years, but just how long this insulation lasts in your home depends on how well it's maintained. Poorly installed insulation may last only 30 years, so be sure to regularly inspect your home's insulation for water damage, settling, and pests to give your insulation the best chance of having a long lifespan.

Open-cell foam insulation has a life span ranging between 15 to 25 years when well cared for. However, the material may degrade sooner in areas with high humidity or after prolonged water exposure. Proper installation and maintenance can maximize its longevity but requires close monitoring. Closed-cell foam insulation has a longer life span of 30 to 50 years.

Minimal maintenance is required, though regular inspections to ensure insulation hasn't shifted or deteriorated can improve performance over time.

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