Depth equals performance
R-value is a function of depth. R-30 needs about 10–11 inches; R-38 needs about 14 inches. If your attic looks thin, your R-value is thin.
Resource Guide
Loose Fill Fiberglass Insulation Guide
Loose fill fiberglass has been the standard for good reason — but only when installed at the right depth.
Back to Loose Fill Fiberglass Insulation
Settling: real or myth?
Modern loose fill fiberglass settles only slightly over decades. The bigger risk is foot traffic compressing it — stay on the joists.
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