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 I remove old attic insulation before adding new?

• <div><p>Ideally, you can add new insulation to your existing insulation. However, some circumstances require you to remove old insulation before adding any new insulation: </p><ul><li><p>If the insulation is over 15 years old</p></li><li><p>If the insulation is wet or moldy</p></li><li><p>If it is <a href="https://www.angi.com/articles/what-is-vermiculite-insulation.htm">vermiculite insulation</a></p></li><li><p>If you see signs of pest infestation</p></li></ul><p>Removing old insulation is best left to a pro who can safely dispose of potential moldy or asbestos-ridden insulation.</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 01, 2026

Reviewed in August 2026
Good install - would hire again.
Finest Assembly & Mounting
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Reviewed in May 2026
Excellent installation On time, knowledgeable and courteous Would absolutely use them again My technician was Alan Orozco
Rittinger Heating and Air
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Reviewed in April 2025
Anthony replaced two hinges and added a third hinge to a 2-hinge door that had been sagging. It works great now. He is an expert in door installation and door hardware. Has very prompt, personable, and knowledgeable. His labor charges are reasonable. The company is family run with his wife at...
Gilmore Doors & Hardware
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Reviewed in March 2025
Super fast response, very professional, and knowledgeable. Got the work done in less than 12 hours after submitting the request including installation of a new part! Bravo!
MC Electric
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Reviewed in March 2024
The installer was very professional from calling too installation. He thoroughly explained how to operate the controllers. I believe he was very honest with his recommendation of which door to purchase. I would definitely recommend him to anyone looking for a honest and professional installer.
M M Garage Door Services, Inc
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Reviewed in September 2023
Installed professionally and look good. Time will tell if they work.
Four Seasons Gutter Filter
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Reviewed in June 2023
They installed about 160 feet of redwood privacy fence with three gates and an additional gated enclosure for a heat pump. For the wood fence itself they did excellent work. Quality material and accommodated some unusual features which meant the entire job was done by one contractor. The owner...
Cuevas Lumber & Fence
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Reviewed in March 2022
The company provided me a very professional instalation service
W Complete Renovation Service
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Reviewed in February 2022
Carlos and Jorge did a fine job of installing an exterior door. Door is plumb and opens/closes perfectly. Thanks!
Supreme Handyman Service
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Reviewed in September 2020
He is very knowledgeable with his work, very professional and patient in explaining how the video doorbell functions. We highly recommend him if you need help.
Smart Security Solutions
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Doorbell Installation questions, answered by experts

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.

Professionals can install a radiant barrier in a day or two, but DIY installation will take several days. The time it takes to install a radiant barrier depends largely on the size of the space and the installation method. Larger homes can take a pro two to three days to finish the job. It’s also quicker to lay foil over existing insulation.

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.

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, usually you will need some kind of vapor barrier on the exterior walls when the framing is attached to concrete and masonry surfaces.

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