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Does Cellulose insulation settle over time, if so how much?

Does settling cause it to lose R-value?

Do you have to blow in extra insulation to make up for the settling?
 

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Yes it does settle. But the r value and coverage listed on the package are at the settled density. If you use the number of bags per square foot the package says, you will actually have "extra" r-value for a couple of years until it reaches it's settled density.
 
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