The answer is yes. Whether your home was built a century ago or just completed, it's probably not too late to install insulation. Many homes do not have adequate attic insulation - often they have none at all. Many homes are insulated with fiberglass that is doing a poor job.

Researchers have found that capping fiberglass with cellulose not only adds R-value, it actually restores the effective R-value that fiberglass loses during cold weather, while capping fiberglass with more fiberglass fails to restore the lost R-value.¹

Older homes are frequently insulated with loose fill fiberglass. Adding a layer of cellulose insulation helps control convection and boosts the R-value.

Newer homes are sometimes insulated with fiberglass batts. A layer of cellulose insulation fills in around the gaps and seams and helps restore lost R-value.

¹ Energy Design Update. "Fixing Fiberglass Problems with Cellulose".