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>

Does ductwork need to be insulated?

• <div><p>Insulating your ducts offers several benefits, including:</p><ul><li><p>Improved energy efficiency: Duct insulation prevents energy losses, reducing heating and cooling costs.</p></li><li><p>Cost savings: Lower energy bills make insulation a cost-effective investment.</p></li><li><p>Environmental benefits: Enhanced efficiency reduces your carbon footprint.</p></li><li><p>Consistent comfort: Insulated ducts help maintain a stable indoor temperature.</p></li><li><p>Better indoor air quality: Reduced allergens and pollutants improve air quality.</p></li></ul><p></p></div>

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Last update on May 20, 2026

Reviewed in May 2026
1st of all they arrived when expected, great customer service, they went over the installation requirements with me. The job was finished quickly, they gave me a quick tour of their finished work. They did a great job from the old fence removal to the new fence installation. All I can say if you...
DanDale Fence
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Reviewed in August 2024
Installers were very friendly and worked very hard to complete the project in one day.
DanDale Fence
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Reviewed in May 2024
Nathan and Victoria came and installed my front entry door and storm door and they did a fantastic job,!
West Shore Home Richmond
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Reviewed in February 2024
Great service and professional installation. I would highly recommend to anyone. They showed up as scheduled and got the install done and tested ahead of plan. Final install is GREAT ð !!
Blue Skies Power & Plumbing
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Reviewed in October 2023
Very professionals. Fast and efficient installation. Heat rejections and privacy is perfect.
DH Professional Window Tinting
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Reviewed in May 2023
Not very good at communicating delays / scheduling install.
Castle - The Window People
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Reviewed in May 2023
Expert installation and very easy to work with.
Solar Filter Company
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Reviewed in April 2023
Waveform installed a ring camera and security system in my house, mounted a TV, and installed a Wi-Fi enabled smart garage door opener. They were professional, clean, quick and knowledgeable. Answered all my questions about which systems were best for me and my house. Once they were installed...
Waveform Professional Services
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Reviewed in August 2022
Britts inc was very professional and timely. Came out for a quote same day I called and new door was being installed exactly 2 weeks later (had to be ordered). Did a great job installing. Great attitude, great quality, no unnecessary or hidden charges! Highly recommend!
Britt's, Inc.
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Reviewed in September 2021
Installers were polite, professional and very hardworking. Very knowledgeable in their work.
RS Andrews of Tidewater
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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.

Reduces energy costs, improves comfort, and prevents ice dams in winter.

Fiberglass is considered a favorite garage insulation choice due to its combination of affordability, ease of installation, and overall effectiveness. Fiberglass provides good thermal resistance, helping regulate garage temperatures and minimize heat transfer. Additionally, fiberglass is moisture-resistant, reducing the risk of mold or mildew formation.

When it comes to fiberglass insulation versus foam board, there are a few notable differences, both aesthetically and functionally. Fiberglass insulation is soft and flexible, meaning it can be squeezed into tight spaces more easily than foam board. Fiberglass insulation also has a higher R-value, making it a better pick for colder climates. However, foam board insulation can resist moisture and pest damage much better than fiberglass.

Insulating your ducts offers several benefits, including:

Improved energy efficiency: Duct insulation prevents energy losses, reducing heating and cooling costs.
Cost savings: Lower energy bills make insulation a cost-effective investment.
Environmental benefits: Enhanced efficiency reduces your carbon footprint.
Consistent comfort: Insulated ducts help maintain a stable indoor temperature.
Better indoor air quality: Reduced allergens and pollutants improve air quality.

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