Should wall insulation be faced or unfaced?

• <div><p>Unfaced wall insulation is easier to cut and install, making it the better choice for a DIY project. It’s also more affordable. But if it’s unfaced, you’ll likely need to add a vapor barrier to reach your desired R-value and efficiency, as it doesn’t offer any moisture barrier.</p><p>Faced insulation uses paper or foil to create a built-in barrier and doesn’t require an extra step. It’s also more fire-resistant and safe. But it’s quite a bit more expensive and a little bit harder to work with as a DIYer.</p></div>

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>

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Last update on August 06, 2026

Reviewed in August 2026
From first contact through completion of the project, Kacey from All About Remodeling was professional, thorough and pleasant. He removed a tub/shower combination and replaced it with a walk in shower. Additionally, Kacey removed the flooring in this bath and a half bath with a LVT product. We...
All About Remodeling LLC
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Reviewed in October 2021
I was pleasantly surprised. Keith and Tyler were very helpful answered all the questions are very respectful. Their installation was neat been done in one day. I’ve been a maintenance person and or a carpenter for several years and I was thinking about doing this installation myself. After...
Total Comfort Heating and Cooling
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Reviewed in February 2021
Evan was super to work with! I've had him working on multiple projects, from detailed new trim work to match in a 100+ year old house (that he blend perfectly I might add) to appliance work installing a boiler radiator, to fixing my garage bay doors, to laying tin on my addition roof, he...
Mader Core
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Reviewed in November 2020
Fluency in English was a problem, otherwise the installers were personable and accommodating. They accidentally cut a wire in our security system, so a further contractor had to be hired to fix the problem.
Empire Today - Indianapolis
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Reviewed in October 2020
We had a new security system installed effectively by Mitch with Premier Provider-ADT. Nothing troublesome or negative to report. 10/10 in every category of service, price, and product.
ADT
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Reviewed in August 2020
Innovative Basement installed a partial drainage system in our basement, to interface with an existing system. The interface was incorrectly addressed, and there was further leakage at the site of the interface. The first technicians that came from IBS to look at it did not recognize any problem...
Groundworks
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Reviewed in July 2020
Excellent work. Very Professional team. If you're looking for a professional Minnesota based team to install a radon mitigation system for you, you will be happy going with Radon Stoppers.
Radon Stoppers
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Reviewed in October 2019
Very happy with Greensource Inc services. I received a call back the next day when I inquired about the windows and siding. Prices were reasonable, quality of windows and siding are good. Installation is done very neat. Installers cleaned up afterward and left my place very clean. The installers...
Heritage Restoration LLC
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Reviewed in August 2019
Great people to work with. Every step of the installation process was done on an agreed upon schedule and when extra time was needed (the cabinets did not arrive assembled), they got it done. They also completed a repair of cabinets at another house that I own. They were awesome. They...
Creative Cabinetry
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Reviewed in September 2016
Everything went well! We truly like the blinds that were installed by AllBrite Blinds. Exceptional consultation prior to us selecting our blinds. We had an idea of what we wanted but with the help of AllBrite Blinds we were able to select the best blind for the two rooms that were in need of...
AllBrite Blinds
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Doorbell Installation questions, answered by experts

Reflective and high R-value batt or roll insulation are often considered energy-efficient, offering significant thermal resistance benefits.

Unfaced wall insulation is easier to cut and install, making it the better choice for a DIY project. It’s also more affordable. But if it’s unfaced, you’ll likely need to add a vapor barrier to reach your desired R-value and efficiency, as it doesn’t offer any moisture barrier.

Faced insulation uses paper or foil to create a built-in barrier and doesn’t require an extra step. It’s also more fire-resistant and safe. But it’s quite a bit more expensive and a little bit harder to work with as a DIYer.

Mineral wool has an excellent life expectancy of up to 50 years, provided it's kept dry and free of pests. Compared to fiberglass, with a life span of 20 to 30 years, mineral wool stacks up well for long-term cost savings. Sheep wool maintains a similar life span to fiberglass, while estimates for hemp wool insulation life expectancies are all over the board, ranging anywhere from 20 to 100 years.

It is generally completed in a day, depending on the attic size and access difficulty.

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.

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