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 Esparto, 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 April 05, 2025

Reviewed in April 2025
Robert from Buzz Electric did a very good job of installing light fixtures and replacing light fan in the bathroom. He removed the rusted old fan carefully using electric saw. It took good amount of time but work quality was great. I will recommend Buzz Electric for anyone who needs large or...
Buzz Electric 2
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Reviewed in February 2025
Hector was very friendly and quick to respond. He came out the same day and got my faucets installed.
BLUELINE PLUMBING
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Reviewed in November 2024
Luviano Brothers Appliance Services originally removed all of our kitchen appliances for a remodel. They then returned to install our new Induction Cooktop. They are friendly, courteous, professional and most of all very knowledgeable, and efficient at their job. Their pricing is reasonable...
Luviano Brothers Appliance Services
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Reviewed in December 2023
We hired NorCal State Builders after we purchased a new home to renovate our kitchen and bathroom. They did a fantastic job! They installed new tile flooring in the kitchen and dining room that matched the existing flooring throughout the rest of the house. they installed new cabinets,...
NorCal State Builders, Inc.
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Reviewed in May 2023
Did a good job installing the dishwasher.
FixitDoug-Unlicensed Contractor
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Reviewed in October 2022
All of the people that I dealt with were extremely personable and professional. I am going to have them back next week when the rest of my lighting comes in. And I am asking for the same installer (Scott) Sincerely, Margaret Stockbridge
Wally Masters Electrical Service
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Reviewed in March 2022
We asked for a dog door to be installed in a wall. Unfortunately, a drain pipe ran right where we wanted the door, but Nate thought on his toes and was able to engineer around the problem. The results were way, way better than we expected. Nate was responsive, friendly and fair.
Royal Design Remodel Repair Inc.
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Reviewed in July 2021
Prompt, courteous,expert craftsman, cleaned up after every day of work. Great pricing, excellent remodel,of garage that included electrical, insulation, sheet rock, tape and texture, window installation, garage door installation, air conditioner/ heater unit, And outside arbor over garage. In...
Black Diamond Construction
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Reviewed in July 2021
1. The Quote process: Michael came out a day or two after I reached out for a quote. I a lot of research and had a ton of questions. He was patient and answered all of them. He was the fourth contractor we had bid this job. We were looking to replace our cedar shingle siding with James Hardie...
Alco Exteriors
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Reviewed in May 2021
The service was great! They did a great job, did it in a timely manner. Paris and Edgar were pleasure to work with, they did a very nice job. They install it more quickly than i thought and it looks really good.
Advanced Interlocking Pavers
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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.

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing insulation.

Experts use advanced techniques and tools to assess existing insulation levels and identify gaps. They implement strategic placement of new insulation to ensure complete coverage, optimizing thermal resistance and energy efficiency.

Periodic checks for moisture or pest issues ensure consistent performance.

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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