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>

How do I choose the right type of insulation?

• <div><p>Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you <a href="https://www.angi.com/articles/r-you-using-right-type-home-insulation.htm">choose the right insulation</a>. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.</p></div>

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Verified Reviews for Doorbell Installation pros in Williston, SC

*The Angi rating for Doorbell Installation companies in Williston, SC 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 Williston, SC 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 September 23, 2025

Reviewed in September 2025
Job was not done well ? talked a good game but did not perform ! Installation very poor ? did not have the right equipment and failed to come back to make it right as promised ? have not received the warranty on the sod as promised yet after repeated requests ! Company should not be on your...
Green Oasis
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Reviewed in March 2025
Our go to company! Justin did an excellent job pressure washing our house. He made it look brand new. Very professional, prompt and detail oriented! While he was there we also got our Christmas lights installed which turned out more beautiful then I could have imagined! Will definitely recommend...
Southern Wave Pressure Washing
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Reviewed in January 2025
The installation of floor upstairs is great! John did a wonderful job matching the stain on the stair treads with our existing hardwood floor!
Tri County Home Renovations L.L.C
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Reviewed in December 2024
The installer was very professional. He wasted no time or materials. He was very organized and did everything step by step.
Mad City Windows & Baths
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Reviewed in August 2024
FANTASTIC JOB! Randy Daniels and Daniels Gutter Company came this week to install our gutters. The whole process working with this company has been very pleasant and stress-free. Randy took time beforehand to understand our needs and explain his process. He arrived on time and as scheduled. ...
Daniels Gutters
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Reviewed in September 2022
Very prompt and friendly service
Quality Life Solutions, LLC
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Reviewed in July 2022
Great customer service, they were very quick with the install, while installing the cameras they explained how the cameras operated and how I could keep the cameras working. They did quality work which was over my budget but was a fair price point.
6:33 Communications & Electric, LLC
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Reviewed in April 2020
I want to give a big thank you to Daryl at Indigo for his assistance in replacing my metal roof. My house is only 11 years old and I’ve been having trouble with the metal roof for about 5 years. I contacted Indigo State Roofing along with four other companies and Daryl was the only business...
Indigo State Roofing
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Reviewed in October 2019
Vargas and Vargas completed the job of painting the exterior of our house. They where always on time, there when they said they would be, mindful of my expectations. I was VERY pleased, so much so we hired them to replace screen on a covered porch, as well as install two slilding glass doors. ...
Vvpcllc
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Doorbell Installation questions, answered by experts

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.

It’s best not to install a radiant barrier directly under insulation because it requires an air gap on at least one side to work properly. Instead, you should install the radiant barrier over your existing insulation to create an air space to reflect the radiant heat.

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.

Insulating your home's exterior walls can realize up to a 20% reduction in your monthly energy bills. This means that regardless of how much the project costs, it can begin to pay you back immediately. Additionally, adding spray foam and other high-end materials can increase the selling value of the property.

Your home's location, budget, and the type of insulation you’re using are just a few of the factors that can help you choose the right insulation. For example, blown-in insulation is typically used in attic spaces, while batts and rolls are ideal for floors and walls. Blown-in insulation is usually a good option if you're adding more insulation to an area that already has some, but not enough.

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