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>

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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*The Angi rating for Doorbell Installation companies in Winfield, MO 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 Winfield, MO 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 April 10, 2025

Reviewed in April 2025
Midtown installed 8 picture windows at my home. The installer was a young man who worked carefully and efficiently and cleaned up the work areas very well afterwards. All my old windows were carted away.
Midtown Home Improvements, Inc. (St. Louis)
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Reviewed in July 2022
Communication was great. Installer was friendly and very helpful.
Loveland Home Solutions LLC
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Reviewed in April 2022
Had too many remotes that I needed to operate my tv. So, I hired Steve to program a universal remote. Now only one remote is needed! Fast service and I had him install a Ring doorbell also. Reliable!
Mr. Gadget, LLC
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Reviewed in December 2021
Very knowledgeable and professional. Quick install
Trionics Superior Water
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Reviewed in November 2021
The installers we're very knowledgeable and worked continuously from dawn to dusk to get the project done in one day. They had our fencing ready to be installed 4 weeks earlier than planned. We were so grateful, as our dogs were used to using a doggy door to go out. For 2 months we had to take...
Midtown Home Improvement, Inc. (Atlanta)
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Reviewed in October 2021
Communication could be a bit better but installation was fast and very nicely done.
Pro Outdoor, Inc.
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Reviewed in July 2021
Great. The company kept in touch through the whole process and delivered and installed the windows when they said they would. 4 installers showed up at 8 this morning and were finished at 11:30. Fast and efficient. I highly recommend.
Universal Windows Direct of St. Louis
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Reviewed in May 2021
Tip notch customer service and install was professionally done. Delays due to material availability but no delays due to installer. Highly recommend Precision Fence & Vinyl
Precision Fence & Vinyl
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Doorbell Installation questions, answered by experts

Structural insulated panels and rigid foam boards have the highest R-value of any insulation that contractors commonly use, with R-values reaching up to around 8.0. These types of insulation are best in extremely cold climates, but they’re generally preferred for new construction, as they can be challenging to retrofit. Blown-in and loose fill insulation provide the next best insulative value, provided the installation is done properly. It’s important to choose an insulation type that meets your needs based on climate, as maximizing R-value may not always be financially worthwhile if you live in a moderate climate.

Costs depend on area size, material thickness, and site preparation needs.

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.

Yes, including recycled denim and cellulose from natural fibers.

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.

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