Just google dense pack cellulose. I have also seen some good videos on youtube.You can actually insert the tube into the middle of a cavity and dense pack the top down. When it's dense packed it will actually hold in place while you pack beneath it. The only way settling will occur is if it's done improperly. This doesn't happen in new construction because the wall get's packed before the sheet rock goes up so you can actually test all of the little nooks and crannies. There is no tamping involved. It's a combination of the pressure from the blower, adjusting the cellulose/air flow, using a smaller tube and technique.
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