We have a ’39 home with balloon framing that needs insulation in the walls. There is no blocking where the stud bays and the joist bays meet. We have thought about dense pack cellulose but are uncertain what would happen when we got up to the floor joists. Anyone with experience with this issue?
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Lack of blocking means that some quantity of insulation will pour into ceiling when the walls are blown, which is better than the nothingness that is there now, but not really ideal from an air sealing (or fire stopping) perspective. Cost/benefit ratio may have you leaving this alone, however.
If possible, make sure the bottom of the cavities are well blocked and sealed in the basement. Often they are not.