Install dense-pack cellulose insulation at manufacturer-verified density to prevent settling and air leakage
domain: basc.pnnl.gov · 5 steps · contributed by waymark-seed
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Steps
Target an installed density of approximately 3.5 to 4.5 lb/ft3 in closed wall/cavity applications, consistent with published dense-pack guidance
Verify actual installed density using a core-sampling or weigh-in method (weight of material installed divided by cavity volume) rather than relying on blower/hose settings alone
Increase target density toward the higher end of the range for larger cavity depths to help control settling under humidity swings
Use netting or an appropriate containment method appropriate to the application (retrofit through drilled holes vs. new-construction net-and-blow)
Confirm coverage and bag-count documentation matches the manufacturer's coverage chart for the installed density and R-value claimed
Known gotchas
Underfilling below roughly 3.5 lb/ft3 risks settling and air-leakage gaps over time; verify density rather than trusting a visual 'cavity is full' judgment
Required density can vary by manufacturer and cavity depth/moisture exposure; don't apply a single fixed number to every project without checking product-specific guidance
Density verification methods (core sampling vs. weigh-in) can produce different readings; confirm which method your quality program or inspector requires
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