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Adding New Insulation over Old Insulation

Do you need to install new insulation in your home? Are you wondering whether you can put new insulation on top of old insulation? It’s possible to put old insulation on top of existing layers, but in some instances, it’s better to remove and replace insulation.

If you’re ready to begin your project, call us at 281-653-8382 281-653-8382 or fill out the contact form on this page. Or keep reading to learn more!

Can I Add New Insulation Over Existing Layers?

While you can add new insulation over older layers, it’s not always the best course of action to take. Existing insulation should always be removed first if it’s:

  • Wet
  • Moldy
  • Mildewed
  • Damaged

Although insulation professionals will handle the installation for you, it’s important to keep a few things in mind when installing new insulation over old insulation. According to ENERGY STAR®:

  • You should not place “faced” insulation 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). 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.
  • Rolled insulation should not be tacked down. The R-value can be reduced if the insulation is squashed or flattened.
  • It’s recommended to air seal before adding more insulation.

Schedule Insulation Installation in Houston, TX

With all these rules and recommendations, it’s a good idea to hire a professional to handle your insulation needs. We have the experience and expertise to perform any insulation job, no matter how big or small.

If you live in the Houston, Texas area, Installed Building Products Houston can help. Contact us today to learn more about our services or to begin your insulation project right away!


Insulation Products We Install
Radiant Barrier

We can help keep your home cooler and more comfortable with an attic radiant barrier.


Our team installs both batt and blown-in fiberglass insulation.


Environmentally friendly and effective, cellulose works well in homes and buildings.


No matter your gutter needs, our team has you covered.

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