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>

Does basement insulation need a vapor barrier?

• <div><p>Yes, basement insulation needs a vapor barrier due to its susceptibility to moisture seeping in from the outside of the house. You should install a moisture barrier before you <a href="https://www.angi.com/articles/how-to-install-insulation.htm">install insulation</a> or purchase insulation that comes prebuilt with a moisture barrier to avoid water damage in your insulation and costly mold and water remediation expenses. </p><p> </p></div>

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Last update on December 02, 2024

Reviewed in December 2024
Andrew was amazing! Not only did he offer a great quote but he also completed fabulous workmanship. I hired Andrew to install my dryer after buying my house and he very carefully mapped everything out and even taught me a few things along the way.
Spotted Dog Home Improvements, LLC
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Reviewed in September 2024
Davis Stone works designed and installed walkways, stairs, raised flower bed around the house four years ago and it still looks beautiful.
Davis Stone Works
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Reviewed in August 2024
Arrived on time. Got old furnace removed and new one installed. Tested perfect. Service with a smile. Thank you so much.
Lone Wolf Energy, LLC
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Reviewed in June 2024
Colin was prompt with his communication, responded within 24 hours to any inquiries, and made smart recommendations when we hired him to install our L2 Charger and replace a burnt-out switch in our kitchen. He worked smart & safe and finished them both in less time than I expected it to take. We...
McCormick Electrical, LLC
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Reviewed in June 2023
Did an installation of a 48 amp EV charger. The were punctual, arrived when they said the would. Professional, introduced themselves, told me the scope of the work they would be doing. Had to cut a small section if drywall to run some cable to charger location. The cut the drywall in such a way...
MJS Electrical Services LLC
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Reviewed in May 2023
They responded quickly and professionally to our request for a quote. They offered options without pressure, then once we agreed on the job, they arrived, did the work cleanly, quickly, and professionally - the crew was well skilled. We have a warrantee, but I suspect that we wonâ t be needing...
North American Roofs
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Reviewed in August 2022
Randy does the job the right way the first time. He does not want call backs. His communication with you is immediate and professional. He lets you know when he will be there and is. I used platinum pipes to install a water heater and will now use them to maintain my entire system.
Platinum Pipes Mechanical LLC
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Reviewed in February 2022
Also replaced my bath tub. Came on time and did both installs neatly and timely. At reasonable price.
Michael J. Belanger Plumbing and Heating
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Reviewed in October 2021
Jim has done an outstanding top notch job on our 100 year old house that he installed 9 custom windows, Jim did the window trim in and out We very highly recommend Creative Home Designs 1 / Jim Dougherty for your homes needs! D Williams.
Creative Home Designs 1
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Reviewed in December 2020
I was shocked at how professional and fast they were! I called them, and they returned the call right away! They installed the flooring as soon as it came in! I really appreciate them and they did a great job! I would definitely recommend them! -Alyssa
Rutland Flooring - Business Service - North Clarendon, Vermont Facebook - 21 Photos
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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.

Yes, basement insulation needs a vapor barrier due to its susceptibility to moisture seeping in from the outside of the house. You should install a moisture barrier before you install insulation or purchase insulation that comes prebuilt with a moisture barrier to avoid water damage in your insulation and costly mold and water remediation expenses.

Fiberglass is the best insulation for HVAC ducting because it's inexpensive, widely available, versatile, and long-lasting. Fiberglass also offers acoustic insulation in addition to thermal insulation, which can contribute to a more peaceful home environment. You can use other materials like mineral wool, but fiberglass is the industry standard.

Monolithic slabs don’t require insulation, but many homeowners choose to have their contractors install insulation under the slab during construction. This can help improve home efficiency even more and keep indoor temperatures more stable. Slab foundations are more energy-efficient than uninsulated crawl spaces and basements, and insulated slab foundations are more energy-efficient than insulated crawl spaces and basements.

Spreading tin foil over your windows works similarly to radiant barrier insulation, but not as well. It will reflect some of the sunlight that would otherwise come through the glass and warm up the inside of your home, so it might help a little to keep your home cool in the summer. However, the appearance isn’t preferable to blinds or drapes that can offer the same benefits. You might also consider tinting your windows instead, which is a more aesthetically pleasing change that can still block a good portion of the solar heat coming through your windows.

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