Can I Put Insulation Over Old Layers?Can I Put Insulation Over Old Layers?

Whether you live in a cold-weather climate like spray foam insulation or warm-weather one like Louisville, proper insulation is essential to your home’s energy efficiency. It keeps your indoor temperatures stable, lowers heating and cooling costs, helps prevent ice dams and other roof damage, reduces moisture problems and improves the value of your home. Adding new insulation to your attic is one of the most cost-effective ways to improve your home’s efficiency. In this article, we answer the question “Can I Put Insulation Over Old Layers?”

If your attic insulation is in good condition, it’s a great idea to add more. But a careful evaluation of the existing insulation is crucial to success. According to National Insulation Solutions, a professional should use thermal imaging and a blower door test to determine the condition of the attic insulation. Moisture is the most important factor in determining attic insulation replacement or addition, as it can lead to mold and mildew in attics and ceiling and roof rafter rot.

Attic Insulation Fire Safety Tips Every Homeowner Should Know

In general, rolled or blown loose-fill fiberglass and cellulose insulation can be added to attic insulation that’s already in place, provided the new insulation is unfaced and doesn’t contain paper or foil. It should also be blown or laid perpendicular to attic joists. It’s also best to avoid tack-stapling rolled or blown loose-fill fiberglass, as this can squash or flatten the insulation and lower its R-value.

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