Should I remove old attic insulation before adding new?

• <div>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: <ul><li>If the insulation is over 15 years old</li><li>If the insulation is wet or moldy</li><li>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></li><li>If you see signs of pest infestation</li></ul>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</div>

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Verified Reviews for Doorbell Installation pros in Raymond, CA

*The Angi rating for Doorbell Installation companies in Raymond, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

*The HomeAdvisor rating for Doorbell Installation companies in Raymond, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Doorbell Installation needs.

Last update on July 12, 2026

Reviewed in July 2026
The two guys who came out on Sat. were great! They showed up when they said they would. We were missing some parts for the garage door opener but they were able to install it with spare parts they brought with them. I would hire them again.
Bob Garage Door
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Reviewed in December 2024
I can't say enough good things about Jesse & Hannah. They are extremely attentive to every detail on my property as well as with billing. They not only regularly maintain the landscaping of my vacation rental property but have also made significant upgrades to the landscaping too. They've...
Rough Terrain Landscapes
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Reviewed in August 2023
Quick and quality service. Professional and courteous. Would hire again.
S S PREMIER PLUMBING
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Reviewed in May 2022
George was very personable and professional. I'll hire him again if I have any other garage door projects.
The Garage Door Guy - Unlicensed Contractor
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Reviewed in May 2022
Wendell was very thorough in his process, and made every effort to accomplish a quality repair. I would highly recommend him!
Webb Roofing
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Reviewed in October 2021
Ed and his crew were extremely friendly and professional. I look forward to hiring Mid State to pave a new driveway to another home on my property this Spring
Mid-State Sealcoating
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Reviewed in July 2021
Very prompt, professional and very quickly completed the job. Thanks Chris and the crew.
Pump 'N Water, Inc.
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Reviewed in April 2021
Very professional and prompt. Great quality of work
Cyber Electric, LLC
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Reviewed in October 2017
this contractor gave me a estimate and told me it would be a month before he could install. i waited a month when he never contaced me i called him. He now told me that he made an error on his estimate and doubled the price. He also stated that if i still wanted to hire him I would have to wait...
Ace Floor Service
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Reviewed in October 2015
Fine, these folks installed the wood stove (that I bought from them) about 3 years ago. It's still under warranty so I call them each year to maintain it and chimney. When they find issues, they let me know. Once I give go ahead, they repair promptly. Great service. 
MOUNTAIN AIRE HEATING & AIR
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Doorbell Installation questions, answered by experts

Doubling the insulation in your home also doubles the R-value of said insulation. In other words, by adding more insulation, you can reduce the heat loss by half. Most homes benefit from increasing insulation. Older homes, in particular tend to have less insulation as is, so doubling your insulation could drastically reduce your energy bills, keep your home more comfortable, and take the strain off your HVAC system.

Yes, they address underlying issues, providing long-term seals and energy savings you might need help to achieve.

Yes, including recycled denim and cellulose from natural fibers.

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.

Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation:

If the insulation is over 15 years old
If the insulation is wet or moldy
If it is vermiculite insulation
If you see signs of pest infestation

Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.

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