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Adding New Insulation Over Old Layers

Does your home need more insulation? Most homes already have layers of insulation in attics and walls. Perhaps you’re wondering if you should remove your current insulation or just add new layers over the old. If your question is “Can you put new insulation on top of old insulation?” we have an answer for you!

In short, yes—you can install new insulation over old insulation.

Contact us to start your project, or keep reading to learn more about adding insulation to your home!

Can I Add New Insulation Over Existing Layers?

According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet. If it is wet or appears that the insulation has previously been wet, you should look for the cause and repair the problem…” Wet insulation is problematic, as it can lead to mold, mildew and sometimes the rotting of ceilings or roof rafters.

Although insulation professionals will handle the installation for you, here are some things to keep in mind about removing old insulation and installing new insulation over old insulation, according to ENERGY STAR:

  • “Faced” insulation should not be placed on top of existing insulation in the attic. Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder (face). The vapor retarder on top of or between layers of insulation can trap moisture. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.
  • Batt or rolled insulation or blown loose-fill insulation (fiberglass or cellulose) can be installed on top of old insulation.
  • Insulation should be rolled out perpendicular to the joists—and unfaced rolls should be used.
  • Rolled insulation should not be tacked down. The R-value can be reduced if the insulation is squashed or flattened.
  • Any vermiculite insulation found in your attic should be tested. If the test reveals that asbestos is present, the vermiculite should be removed by a certified professional before installing more insulation.
  • It’s recommended to air seal before installing insulation since air leaks can hinder the performance of insulation and significantly reduce the energy efficiency and comfort of your home.

The most important thing to keep in mind is that you don’t have to worry about all this. Professionals will be able to answer any questions you have—and handle your entire home insulation project.

If you live in the Nashville, Tennessee area, Installed Building Products of Nashville can help. We have experience installing all types of insulation and can help you with your project. Contact us today to learn more about our services or if you’re ready for a quote!

Products We Install
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Fiberglass Insulation

Our insulation team adds energy efficiency, comfort & value to homes & buildings.

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Spray Foam Insulation

IBP of Nashville is proud to be a leading installer of spray foam insulation.

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