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 Hilo, HI

*The Angi rating for Doorbell Installation companies in Hilo, HI 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 Hilo, HI 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 March 25, 2026

Reviewed in March 2026
Pro Installers communicated well in scheduling the time as well as as an estimate and was very communicative to coordinate the time. They were on time and efficient and clean, polite professional,and efficient.
Pro Installers
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Reviewed in February 2026
Professional service, job exceeded my expectations. I would call John again for installations and any tasks needed for our house in Hawaii. Mahalo!
John Tatus
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Reviewed in December 2025
I received excellent service from Jed. He was very patient, helpful & knowledgeable. Helped with several problems that arose with my request to have a TV mounted & installed. I would definitely recommend him to others as a service provider.
Ledebest Home Solutions
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Reviewed in September 2025
We had a great experience working with Elite Landscaping and Irrigation! They were able to take our design, plant preferences, budget considerations and make our vision come to life. They extended our lanai space with a surrounding walkway, installed a retaining wall, stairs for better access...
Elite Landscaping and Irrigation
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Reviewed in August 2025
I highly recommend Sean Gustin’s work with Kadywampus Construction/ Precision Epoxy Solutions. He built a lanai for me and visualized, planned and executed it staying within budget and scheduled timeframe. I got two bids for the project, and his bid was lower and reasonable. He drew up a...
Kadywampus Construction
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Reviewed in July 2025
hired them to install new outlets in my oceanfront condo, they did excellent and fast work, highly recommend.
Reliable Repairs Hawaii LLC
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Reviewed in October 2024
Nick was extremely helpful and highly professional. He was very patient as my home was found to have multiple unknown plumbing leaks, but he was exceptionally knowledgeable and fixed all my issues timely. Nick also replaced the shower in my bathroom that needed to be updated and installed...
Go With The Flow Plumbing LLC
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Reviewed in July 2022
Kyle was excellent from start to finish. We did not ultimately install solar, but he did install my EV charger. The price was reasonable and he was timely and thorough in everything. It was a pleasant and easy experience! Highly recommend him and DKN Electrical!
DKN Electrical
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Reviewed in June 2021
I had a difficult fencing project and needing an experienced contractor with the skills to install and repair fencing capable of containing livestock and withstanding wild pig intrusion. Kaumana Construction Services came out to review the project and were incredibly helpful. They not only...
Kaumana Construction Services Hawaii
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Reviewed in May 2021
Project: Install Pre-Made Cabinets and granite countertops Very good work ethics, pleasant and easy to work with, keep me informed throughout the project, respectful and responsible workers,. Thanks guys, enjoyed working with you! Anthony Agbigay
Chun-Lai Construction
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Top-Rated Doorbell installation pros in Hilo - Updated Nov 2026

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Doorbell Installation FAQs, answered by experts

They recommend sustainable materials and water-saving fixtures, tailoring choices to balance sustainability and style.

Structural insulated panels and rigid foam boards have the highest R-value of any insulation that contractors commonly use, with R-values reaching up to around 8.0. These types of insulation are best in extremely cold climates, but they’re generally preferred for new construction, as they can be challenging to retrofit. Blown-in and loose fill insulation provide the next best insulative value, provided the installation is done properly. It’s important to choose an insulation type that meets your needs based on climate, as maximizing R-value may not always be financially worthwhile if you live in a moderate climate.

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.

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.

Acoustic foam, fiberglass insulation, soundproof curtains, and specialized drywall are effective in reducing noise transmission.

The Hilo, HI homeowners’ guide to doorbell installation services

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