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>

Can you install fiberglass insulation yourself?

• <div><p>If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall <a href="https://www.angi.com/articles/how-much-does-insulation-cost.htm">insulation costs</a> down. However, if you’re not confident in your handy skills around the house, call in a professional.</p></div>

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*The Angi rating for Doorbell Installation companies in Benton, IL 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 January 08, 2026

Reviewed in January 2026
Had a front door installed where there had not been one. Contractor went above and beyond what was expected by installing insulation and OSB where we had already removed existing siding. Contractor cleaned up and removed all debris from job site. We will be using this contractor for other...
RW Construction
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Reviewed in September 2025
Jared did a fantastic job with the build and install. Excellent work. Excellent communication. Highly recommended.
JW Custom Cabinets
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Reviewed in February 2024
Thomas arrived on time, and was very professional and personable. He installed my new front door. He concentrated and focused on delivering excellence, and takes pride in his carpentry skills. He even picked up my new exterior door at Menards so I did not have to pay for the shipping. I...
Thomas's Construction LLC
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Reviewed in August 2022
I had good vibes about Josh from the first time I met him, when he came out to give an estimate on removing all of the old vinyl siding on our house and installing new board and batten vinyl siding. As time progressed through the project those vibes proved to be correct. Josh is an extremely...
JL Construction
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Reviewed in April 2022
Mr Dustin Rapp who I hired from Angie’s List has 16-20 years of experience and knowledge, respectful, and professional in Carpentry which is his Trade. Did excellent work on installing Crown Molding on the tops of my kitchen cabinets and I would recommend Mr Rapp to anyone in need of a great guy...
D Rapp Construction
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Reviewed in March 2022
Overprice and did not install correctly and does not work
J&L Tree Service
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Reviewed in January 2021
When it came time to make the decision to install a brand new central air unit with an electric heat pump and after speaking with Clay on the spot it was a no-brainer and it was the best decision/investment I have made to my new home to the date.
Jany's "On The Spot" Heating and Cooling
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Reviewed in October 2020
He did some tiles, back splash, roofing, and installed a front door for us. He did a great job! He guaranteed my work too.
Stanley's Remodeling
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Reviewed in January 2020
Clay is an excellent HVAC specialist. He is honest as the day is long. He quickly solved our a/c problem and has installed a new gas furnace that works great. It has been a pleasure to do business with him. It is a blessing to know we have him as a neighbor.
On The Spot Heating and Air
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Reviewed in December 2019
This was no simple project, it was necessary for several fixtures to be moved and a cabinet to be made to fit. We are a Public Library and are only open a few days a week with specific hours. In addition to this project, he has installed a light fixture in the ceiling, an emergency light, a...
B & D Construction and Electrical
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Doorbell Installation questions, answered by experts

Through R-value assessments based on climate and existing insulation.

Insulating a detached garage won't reduce your home's heating or cooling bills—and insulating an attached garage will only have a small effect on your home's energy efficiency. However, insulating an attached garage can reduce the transfer of heating and cooling to and from the outdoors, which can reduce the amount of energy your home needs to stay comfortable. Also, having an insulated garage is just more pleasant. Balance the cost of insulating your garage with how you'll use the space to determine if the project is worth it.

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.

You don’t need to staple insulation, as your drywall and studs will hold it into place. But if you already have a staple gun and staples lying around, it can help keep the product in place and avoid any shifting. But, most experts agree it’s an unnecessary step.

If you’re adding a vapor barrier, you will need to staple that in place.

If you’re a savvy DIYer around the house, own the basic tools, and have enough time on your hands, you can definitely install fiberglass insulation yourself. Doing the work yourself will certainly keep overall insulation costs down. However, if you’re not confident in your handy skills around the house, call in a professional.

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