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Adding New Insulation Over Old Insulation

When is the last time you went up into your attic? If it’s been years, or if you’ve never gone up there, it may be time to think about your insulation. The insulation in your attic helps keep your home energy-efficient and comfortable—but not if it’s damaged.

It it time to re-insulate your home? You may be wondering if you can add new insulation on top of old insulation or if you need to completely remove and replace it. The short answer is that you can choose either one, it really depends on the situation.

Contact us for a FREE quote on your project, or keep reading to learn more about adding insulation to your home!

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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 roll or batt 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 harmful chemicals are 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.

Just keep in mind is that you don’t have to worry about doing this on your own. Insulation professionals will be able to answer any questions you have about putting new insulation on top of existing insulation—and handle the entire project from start to finish.

If you live in the San Diego or Los Angeles area, call the experts at OJ Insulation. We have experience installing different 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 free estimate!

Where should you insulate in your home? Check out our interactive infographic:

SERVICES WE PROVIDE
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Home Insulation

We insulate attics, walls and crawl spaces.

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Commercial Insulation

We insulate warehouses, offices, studio spaces & more.

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Insulation Removal

Do you need to remove old insulation? We can help.

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Fireplaces & Mantels

We work with builders to install fireplaces and mantels.

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